speccoder_runtime/substrate/

attempt.rs

//! `speccoder.task.attempt`: one bounded, governed attempt at a task
//!.
//!
//! The model works through speccoder's tools; every call it asks for is
//! classified by the policy first (deny → refused and told; approval → the
//! attempt stops for a person; allow → dispatched through agentplane). The
//! model's closing report is recorded as its claim — the verdict is computed
//! afterwards by the verifier, never here.

use crate::format::Wording;
use agentplane::core::Label;
use agentplane::model::{ToolDeclaration, Transcript};
use agentplane::prelude::*;
use agentplane::tools::ToolId;
use serde_json::{Value, json};

use super::model_config::{CacheTtl, PromptStyle};
use super::propose::layout;
use super::provenance;
use crate::approvals::{Answer, Decision as Said, PresentContext, Request, Scope, Who};
use crate::tools::policy::{Decision, Object, Policy};

/// The capability the skill provides.
pub const CAPABILITY: &str = "speccoder.task.attempt";

/// The control tool for an honest exit. Handled by the skill, not
/// dispatched anywhere.
pub const REPORT_BLOCKED: &str = "report_blocked";

/// What speccoder tells the model about an attempt; stable for the project.
pub fn policy(w: &Wording) -> String {
    format!(
        "You are speccoder, a coding agent implementing exactly one {product} task in a git \
worktree. Use the tools to inspect the code, make the smallest change that completes the \
task — never work another task of the list is for — and run the project's checks with run_command to see whether it works. Stay inside \
the task's scope: the task's paths are the plan's guess — where they differ from the code, \
use the module that holds it; a change elsewhere that the task or its acceptance tests need \
(an entry point they run, a module they import) is in scope and shown to the reviewer, never \
a reason to stop: an entry point that bypasses the task's module is rewired to it. You \
cannot edit the spec ({intent}), the checks' configuration or .git; such calls are refused. Some commands need a person's approval and will end the \
attempt — prefer configured checks. If the task cannot be done as written — it \
contradicts the spec, needs information or access you lack, or a test is wrong — call \
report_blocked with the reason instead of working around it. Test files that existed \
when the attempt started are frozen: add new tests in new files (or next to the code), \
never by editing those. Never weaken, skip or delete tests to make checks pass. Never \
return values copied from tests or examples in place of the specified behaviour (a \
constant where the spec asks for a computed, fetched or current value is a cheat): if \
the specified behaviour is impossible under the stated constraints, call report_blocked. \
You are not the judge: when you finish, speccoder runs the checks itself and decides. \
Finish with the requested structured report; its status is `incomplete` only when part of \
this task's own work is left undone — a check you could not run, a test a later task makes \
pass, or a finding in a frozen test file is no reason.",
        product = w.product,
        intent = w.intent_paths,
    )
}

/// The final report's schema (the model's claim).
#[must_use]
pub fn report_schema() -> Value {
    let strings = json!({ "type": "array", "items": { "type": "string" } });
    json!({
        "type": "object",
        "properties": {
            "summary": { "type": "string" },
            "status": {
                "type": "string",
                "enum": ["done", "incomplete"],
                "description": "done: this task's work is finished — even while tests that later tasks make pass still fail. incomplete: part of this task is left undone."
            },
            "files_changed": strings,
            "checks_run": strings,
            "notes": strings,
        },
        "required": ["summary", "status", "files_changed", "checks_run", "notes"],
        "additionalProperties": false,
    })
}

fn report_blocked() -> ToolDeclaration {
    ToolDeclaration::new(
        REPORT_BLOCKED,
        "Stop the attempt because the task cannot be done as written; a person will look at the \
reason. `kind`, with the `evidence` speccoder checks: `refused` — a call the task needs was \
refused (the call); `spec_conflict` — the spec contradicts the task (its exact words); \
`wrong_test` — a frozen test asserts the wrong thing (its path); `needs_information` — only a \
person knows (the question). Scope is never a kind: when the tests run code that bypasses the \
task's module (an entry point, a caller), wiring that code to it is part of the task.",
        json!({
            "type": "object",
            "properties": {
                "kind": { "type": "string", "enum": ["refused", "spec_conflict", "wrong_test", "needs_information"] },
                "evidence": { "type": "string" },
                "reason": { "type": "string" },
            },
            "required": ["kind", "evidence", "reason"],
            "additionalProperties": false,
        }),
    )
}

/// What a `report_blocked` call is checked against: its evidence must be
/// there, never the model's word alone.
#[derive(Default)]
pub(crate) struct StopGate {
    /// The spec text the prompt carried: what a `spec_conflict` quotes.
    pub spec: String,
    /// The tests frozen when the attempt started: what a `wrong_test` names.
    pub frozen: Vec<String>,
    /// A person rejected a call for this task before.
    pub rejected: bool,
}

/// What speccoder does with a `report_blocked` call.
#[derive(Debug, PartialEq, Eq)]
enum Stop {
    /// The evidence is not there: the attempt goes on, told why.
    Refused(String),
    /// Asked once before stopping, with the turns left.
    Asked(String),
    /// The attempt stops; the reason the person reads.
    Stopped(String),
}

/// Judges a stop by its evidence: a refused call stops at once; a quote,
/// a frozen test or a question is asked about once first.
fn judge_stop(
    gate: &StopGate,
    arguments: &Value,
    refused: bool,
    asked: bool,
    turns_left: u32,
) -> Stop {
    let text = |k: &str| arguments[k].as_str().unwrap_or_default().trim();
    let (kind, evidence, reason) = (text("kind"), text("evidence"), text("reason"));
    let words = |t: &str| t.split_whitespace().collect::<Vec<_>>().join(" ");
    let checked = match kind {
        "refused" if refused => format!("refused call `{evidence}`"),
        "refused" => return Stop::Refused("not stopped: no call in this attempt was refused or rejected".to_owned()),
        "spec_conflict" if evidence.chars().count() >= 12 && words(&gate.spec).contains(&words(evidence)) => {
            format!("the spec says “{evidence}”")
        }
        "spec_conflict" => {
            return Stop::Refused("not stopped: the evidence must be the spec's exact words, at least a phrase; these are not in it".to_owned());
        }
        "wrong_test" if gate.frozen.iter().any(|f| f == evidence.trim_start_matches("./")) => {
            format!("frozen test `{evidence}`")
        }
        "wrong_test" => return Stop::Refused("not stopped: the evidence must be the path of a test that existed when the attempt started".to_owned()),
        "needs_information" if !evidence.is_empty() => format!("question: {evidence}"),
        _ => return Stop::Refused("not stopped: `kind` is one of refused, spec_conflict, wrong_test, needs_information, with its `evidence`".to_owned()),
    };
    // The model's reason first, then what speccoder checked.
    let said = match reason {
        "" => checked,
        r if r == evidence => r.to_owned(),
        r => format!("{r} — {checked}"),
    };
    // Asked once only, and never on the last turn: no answer could follow.
    if kind == "refused" || asked || turns_left == 0 {
        return Stop::Stopped(said);
    }
    Stop::Asked(format!(
        "Not stopped yet: speccoder asks once before a stop. {turns_left} turns are left. The task's paths are the plan's guess: wiring an entry point, caller or import the tests run to the task's module is part of the task, and a failing check is a reason to keep going. If the task still cannot be done as written, call report_blocked again."
    ))
}

/// The question tool a hosted skill may use.
pub const ASK_PERSON: &str = "ask_person";

/// The `ask_person` declaration.
#[must_use]
pub fn ask_person() -> ToolDeclaration {
    ToolDeclaration::new(
        ASK_PERSON,
        "Ask the person one question and wait for their answer. If nobody can answer, the reply says so.",
        json!({
            "type": "object",
            "properties": { "question": { "type": "string" } },
            "required": ["question"],
            "additionalProperties": false,
        }),
    )
}

/// How an attempt waits for a person when a call needs one: on an
/// agentplane human task the person decides — inline, from an editor, or
/// later with `speccoder task approve` — while the run is suspended.
#[derive(Debug, Clone)]
pub struct Asker {
    /// `feature/task`, shown to the person.
    pub task: String,
    /// The task's title.
    pub task_title: String,
    /// What the live run knows for the presentation.
    pub context: PresentContext,
    /// How long a call waits before it is denied as expired.
    pub wait_secs: u64,
}

impl Asker {
    /// The asker the journaled settings describe: `asks = "tasks"` waits on
    /// a task; anything else (`"stop"`, a lane) stops the attempt instead.
    #[must_use]
    pub fn from_settings(
        settings: &Value,
        task: String,
        task_title: String,
        context: PresentContext,
    ) -> Option<Self> {
        (settings["asks"] == "tasks").then(|| Self {
            task,
            task_title,
            context,
            wait_secs: settings["wait_secs"].as_u64().unwrap_or(7 * 86_400),
        })
    }
}

/// Waits for a person's decision on `spec`, registering the `approval`
/// obligation the first time: the run suspends until someone decides or the
/// deadline passes. Journaled — replay reads the decision back.
async fn wait_for_person(
    cx: &mut StepCtx<'_>,
    asker: &Asker,
    obligation: &mut bool,
    spec: &agentplane::core::TaskSpec,
) -> Result<agentplane::core::Decision, SkillError> {
    if !*obligation {
        let minutes = u32::try_from(asker.wait_secs.div_ceil(60).max(1)).unwrap_or(u32::MAX);
        cx.deadline(
            crate::approvals::tasks::DEADLINE,
            &agentplane::core::DeadlineSpec::minutes(minutes),
            None,
        )
        .await?;
        *obligation = true;
    }
    Ok(cx.task(spec).await?)
}

/// The coded skill.
///
/// Everything its decisions depend on — the bundle, the policy's command
/// prefixes and the limits — arrives in the run's input, so it is journaled
/// and strict replay needs no configuration. Only the prompt dialect
/// is construction-time, and it is part of each model call's effect key.
#[derive(Debug)]
pub struct Attempt {
    /// Prompt dialect.
    pub style: PromptStyle,
    /// Cache breakpoint lifetime.
    pub cache_ttl: CacheTtl,
    /// Where live progress goes; not journaled, `None` in replay.
    pub progress: Option<std::sync::Arc<dyn crate::progress::Progress>>,
    /// The project's spec format.
    pub format: &'static dyn crate::format::Adapter,
    /// The sandbox, as a person asked about a command is told; live only.
    pub present: PresentContext,
}

/// A turn's progress, said only where no earlier pass said it: dropped
/// while `replaying` (agentplane's `StepCtx::replaying`, read after each
/// journaled step) holds.
#[derive(Debug)]
struct Quiet {
    replaying: std::sync::Arc<std::sync::atomic::AtomicBool>,
    next: std::sync::Arc<dyn crate::progress::Progress>,
}

impl crate::progress::Progress for Quiet {
    fn event(&self, event: &crate::progress::Event) {
        if !self.replaying.load(std::sync::atomic::Ordering::SeqCst) {
            self.next.event(event);
        }
    }
}

/// The run input: `{ bundle, settings: { checks, allow, max_turns,
/// max_tool_calls, frozen, … }, digest }` — `digest` is the verifier's
/// account of the previous attempt, `null` on a first attempt.
///
/// Labelled by where each part came from: the bundle is the
/// person's committed spec and plan (trusted); the digest quotes check
/// output (`speccoder://verifier`); the settings list MCP tool descriptions
/// (their servers).
#[must_use]
pub fn input(
    bundle: Value,
    settings: &Settings<'_>,
    digest: Option<&Value>,
    instructions: &[crate::instructions::Instruction],
    test_layout: Option<&str>,
) -> Tainted<Value> {
    let digest = match digest.filter(|d| !d.is_null()) {
        Some(d) => Tainted::with_label(d.clone(), provenance::from(provenance::VERIFIER)),
        None => Tainted::trusted(Value::Null),
    };
    // Each MCP tool's description and schema are its server's words.
    let mcp = Tainted::array(settings.mcp.iter().map(|t| {
        Tainted::with_label(
            serde_json::to_value(t).unwrap_or(Value::Null),
            agentplane::core::Label::untrusted(provenance::tool(&t.server, &t.tool)),
        )
    }));
    let trusted = |v: Value| Tainted::trusted(v);
    let autopilot = settings.autopilot;
    let planning = settings.planning;
    let contained = settings.contained;
    let settings = vec![
        ("checks", trusted(json!(settings.checks))),
        ("allow", trusted(json!(settings.allow))),
        ("max_turns", trusted(json!(settings.max_turns))),
        ("max_tool_calls", trusted(json!(settings.max_tool_calls))),
        ("reasoning", trusted(json!(settings.reasoning))),
        ("frozen", trusted(json!(settings.frozen))),
        ("approved", trusted(json!(settings.approved))),
        ("rejected", trusted(json!(settings.rejected))),
        ("run_approved", trusted(json!(settings.run_approved))),
        ("approved_once", trusted(json!(settings.approved_once))),
        ("nudges", trusted(json!(settings.nudges))),
        ("mcp", mcp),
        ("root", trusted(json!(settings.root))),
        (
            "frozen_additions",
            trusted(json!(settings.frozen_additions)),
        ),
        ("network_allow", trusted(json!(settings.network_allow))),
        ("allow_prefix", trusted(json!(settings.allow_prefix))),
        (
            "network_allow_prefix",
            trusted(json!(settings.network_allow_prefix)),
        ),
        ("run_id", trusted(json!(settings.run_id))),
        ("asked", trusted(json!(settings.asked))),
        ("budget", trusted(json!(settings.budget))),
        ("left", trusted(json!(settings.left))),
        ("prompts", trusted(json!(settings.prompts))),
        ("asks", trusted(json!(settings.asks))),
        ("wait_secs", trusted(json!(settings.wait_secs))),
        ("in_place", trusted(json!(settings.in_place))),
        ("hidden", trusted(json!(settings.hidden))),
    ];
    // Only an autopilot run carries the key: every other input reads as
    // it was recorded before it existed.
    let mut settings = settings;
    if autopilot {
        settings.push(("autopilot", trusted(json!(true))));
    }
    // Likewise only a planning task's.
    if let Some(dir) = planning {
        settings.push(("planning", trusted(json!(dir))));
    }
    // And only a run whose sandbox confines what it runs.
    if let Some(m) = contained {
        settings.push(("contained", trusted(json!(m))));
    }
    let settings = Tainted::object(settings);
    Tainted::object([
        ("bundle", Tainted::trusted(bundle)),
        ("digest", digest),
        ("settings", settings),
        // The repository's text, as if the model had read the files itself;
        // none is no text, and no label.
        (
            "instructions",
            if instructions.is_empty() {
                Tainted::trusted(json!([]))
            } else {
                Tainted::with_label(json!(instructions), provenance::from(provenance::WORKTREE))
            },
        ),
        // The test layout speccoder detected from the checkout.
        (
            "test_layout",
            match test_layout {
                Some(t) => Tainted::with_label(json!(t), provenance::from(provenance::WORKTREE)),
                None => Tainted::trusted(Value::Null),
            },
        ),
    ])
}

/// A refusal speccoder composes about a call quotes it — the tool, path or
/// command the model chose — so it carries the call's label; only
/// constant replies are trusted.
fn refusal(text: String, call: &agentplane::core::Label) -> Tainted<String> {
    Tainted::with_label(text, call.clone())
}

/// The parts of an attempt's input its messages quote.
const MESSAGE_PARTS: [&str; 7] = [
    "/bundle",
    "/instructions",
    "/test_layout",
    "/digest",
    "/settings/nudges",
    "/settings/rejected",
    "/settings/mcp",
];

/// The label of the conversation part: the join of the labels the run was
/// admitted with for the parts it quotes — read, never inferred. A part
/// without a label of its own takes the whole input's (fails closed).
fn conversation_label(input: &Tainted<Value>) -> agentplane::core::Label {
    MESSAGE_PARTS
        .iter()
        .map(|p| input.label_at(p).unwrap_or_else(|| input.label()).clone())
        .fold(agentplane::core::Label::trusted(), |acc, l| acc.join(&l))
}

/// What an attempt decides by, besides its bundle (all journaled).
#[derive(Debug, Clone, Copy)]
pub struct Settings<'a> {
    /// Configured checks' argvs (their prefixes are allowed commands).
    pub checks: &'a [Vec<String>],
    /// Exact commands allowed (`[commands] allow`).
    pub allow: &'a [Vec<String>],
    /// Allowed command prefixes (`[commands] allow_prefix`).
    pub allow_prefix: &'a [Vec<String>],
    /// Model turns.
    pub max_turns: u32,
    /// Tool calls.
    pub max_tool_calls: u32,
    /// Ask for the model's reasoning summary on every turn.
    pub reasoning: bool,
    /// Test files frozen for this attempt.
    pub frozen: &'a [String],
    /// A person's approvals for this task, in this run.
    pub approved: &'a [Object],
    /// A person's rejections for this task.
    pub rejected: &'a [crate::tools::policy::Rejection],
    /// Objects a person approved for every task of this run.
    pub run_approved: &'a [Object],
    /// Objects a person approved for one call each (a call a lane stopped,
    /// decided in its run's batch): this attempt may make each one time.
    pub approved_once: &'a [Object],
    /// A person's notes for this task (`nudge`).
    pub nudges: &'a [String],
    /// The project's MCP tools for this run.
    pub mcp: &'a [crate::mcp::McpTool],
    /// The worktree's absolute (canonical) path.
    pub root: &'a str,
    /// Frozen tests may gain lines without approval (`[tests] frozen`).
    pub frozen_additions: bool,
    /// How a call needing a person is handled: `"tasks"` (the attempt waits
    /// on a human task) or `"stop"` (it ends `needs_approval`; lanes).
    pub asks: &'a str,
    /// How long a call waits for a person before it is denied as expired.
    pub wait_secs: u64,
    /// Exact commands that get the network (`[sandbox] network_allow`).
    pub network_allow: &'a [Vec<String>],
    /// Prefixes that get it (`[sandbox] network_allow_prefix`).
    pub network_allow_prefix: &'a [Vec<String>],
    /// The run the attempt belongs to.
    pub run_id: &'a str,
    /// Prompts the run has shown a person so far.
    pub asked: u32,
    /// `[approvals] budget`.
    pub budget: u32,
    /// A person is prompted inline (not `--no-prompt`).
    pub prompts: bool,
    /// An in-place attempt: git that moves the checkout is denied.
    pub in_place: bool,
    /// In place: what git ignored at the run's start, hidden from the tools.
    pub hidden: &'a [String],
    /// An autopilot run: a call that would ask is refused instead.
    pub autopilot: bool,
    /// A planning task: its unit's directory (worktree-relative), whose
    /// design documents it writes ([`Policy::planning`]).
    pub planning: Option<&'a str>,
    /// The enforced sandbox's mechanism when contained calls run without
    /// asking ([`Policy::contained`]).
    pub contained: Option<&'a str>,
    /// What is left of the run's cap for this attempt.
    pub left: Option<Left>,
}

/// The calls consecutive denials of which end an attempt.
pub const MAX_CONSECUTIVE_DENIALS: u32 = 3;

/// The digest as the model reads it: facts from the verifier only.
fn digest_text(digest: &Value) -> String {
    let mut out = format!(
        "# Previous attempt\n\nAttempt {} at this task was verified by speccoder and FAILED. Its \
changes were discarded; the worktree is back where that attempt started. You start fresh — use \
these facts from the verifier, check them yourself, and do not repeat the mistake.\n",
        digest["attempt"].as_u64().unwrap_or(1)
    );
    let strings = |v: &Value| -> Vec<String> {
        v.as_array()
            .map(|a| {
                a.iter()
                    .filter_map(|x| x.as_str().map(str::to_owned))
                    .collect()
            })
            .unwrap_or_default()
    };
    let reasons = strings(&digest["reasons"]);
    if !reasons.is_empty() {
        out.push_str("\n## Verdict reasons\n\n");
        for r in reasons {
            out.push_str(&format!("- {r}\n"));
        }
    }
    for c in digest["checks"].as_array().into_iter().flatten() {
        out.push_str(&format!(
            "\n## Check `{}` ({}): `{}`\n",
            c["name"].as_str().unwrap_or_default(),
            c["status"].as_str().unwrap_or_default(),
            strings(&c["argv"]).join(" ")
        ));
        let tests = strings(&c["failing_tests"]);
        if !tests.is_empty() {
            out.push_str(&format!("\nFailing tests: {}\n", tests.join(", ")));
        }
        out.push_str(&format!(
            "\n```text\n{}\n```\n",
            c["excerpt"].as_str().unwrap_or_default()
        ));
    }
    let uncollected = strings(&digest["uncollected"]);
    if !uncollected.is_empty() {
        out.push_str("\n## Tests that never ran\n\n");
        for l in uncollected {
            out.push_str(&format!("- {l}\n"));
        }
    }
    let discarded = strings(&digest["discarded"]);
    if !discarded.is_empty() {
        out.push_str(&format!(
            "\n## Files the discarded attempt changed\n\n{}\n",
            discarded.join("\n")
        ));
    }
    out
}

fn argvs(v: &Value) -> Vec<Vec<String>> {
    v.as_array()
        .map(|a| {
            a.iter()
                .map(|argv| {
                    argv.as_array()
                        .map(|p| {
                            p.iter()
                                .filter_map(|x| x.as_str().map(str::to_owned))
                                .collect()
                        })
                        .unwrap_or_default()
                })
                .collect()
        })
        .unwrap_or_default()
}

/// A person's decisions of the journaled input at `key`: none when absent,
/// an error when present and unreadable — never read as "no decisions",
/// which would drop rejections.
fn decisions_of<T: serde::de::DeserializeOwned>(
    settings: &Value,
    key: &str,
) -> Result<Vec<T>, SkillError> {
    match &settings[key] {
        Value::Null => Ok(Vec::new()),
        v => serde_json::from_value(v.clone())
            .map_err(|e| SkillError::Input(format!("settings.{key}: {e}"))),
    }
}

/// The policy an attempt's journaled settings decide by: the checks, the
/// allow lists, the frozen tests, the person's decisions, the MCP tools,
/// the network rules, in place and autopilot. An external agent's attempt
/// is decided by the same one.
pub(crate) fn policy_of(
    settings: &Value,
    rules: &'static crate::format::Rules,
) -> Result<Policy, SkillError> {
    let frozen: Vec<String> = settings["frozen"]
        .as_array()
        .map(|a| {
            a.iter()
                .filter_map(|v| v.as_str().map(str::to_owned))
                .collect()
        })
        .unwrap_or_default();
    let approved: Vec<Object> = decisions_of(settings, "approved")?;
    let rejected: Vec<crate::tools::policy::Rejection> = decisions_of(settings, "rejected")?;
    let mcp: Vec<crate::mcp::McpTool> =
        serde_json::from_value(settings["mcp"].clone()).unwrap_or_default();
    let policy = Policy::new(&argvs(&settings["checks"]), &argvs(&settings["allow"]))
        .with_prefixes(argvs(&settings["allow_prefix"]))
        .with_network_prefixes(argvs(&settings["network_allow_prefix"]))
        .rules(rules)
        .with_frozen(frozen)
        .with_decisions(approved, rejected)
        .with_mcp(mcp.iter().map(|t| (t.name.clone(), t.decision.clone())))
        .with_network(argvs(&settings["network_allow"]))
        .with_hidden(
            serde_json::from_value::<Vec<String>>(settings["hidden"].clone()).unwrap_or_default(),
        );
    let policy = if settings["in_place"] == true {
        policy.in_place()
    } else {
        policy
    };
    let policy = if settings["autopilot"] == true {
        policy.autopilot()
    } else {
        policy
    };
    let policy = match settings["contained"].as_str() {
        Some(m) => policy.contained(m),
        None => policy,
    };
    Ok(match settings["planning"].as_str() {
        Some(dir) => policy.planning(dir),
        None => policy,
    })
}

#[async_trait]
impl Skill for Attempt {
    fn descriptor(&self) -> SkillDescriptor {
        SkillDescriptor::new("speccoder.task.attempt").provides(CAPABILITY)
    }

    async fn invoke(
        &self,
        cx: &mut StepCtx<'_>,
        input: Tainted<Value>,
    ) -> Result<Outcome, SkillError> {
        let (ttl, style) = (self.cache_ttl, self.style);
        let settings = input.peek()["settings"].clone();
        let task_name = format!(
            "{}/{}",
            input.peek()["bundle"]["feature"]
                .as_str()
                .unwrap_or_default(),
            input.peek()["bundle"]["task"]["id"]
                .as_str()
                .unwrap_or_default()
        );
        let rejected: Vec<crate::tools::policy::Rejection> = decisions_of(&settings, "rejected")?;
        let told = rejected;
        let bundle = &input.peek()["bundle"];
        let stop = StopGate {
            spec: ["story", "plan", "constitution"]
                .iter()
                .filter_map(|k| bundle[*k].as_str())
                .chain(bundle["task"]["title"].as_str())
                .collect::<Vec<_>>()
                .join("\n"),
            frozen: settings["frozen"]
                .as_array()
                .into_iter()
                .flatten()
                .filter_map(|v| v.as_str().map(str::to_owned))
                .collect(),
            rejected: !told.is_empty(),
        };
        let mcp: Vec<crate::mcp::McpTool> =
            serde_json::from_value(settings["mcp"].clone()).unwrap_or_default();
        let planning = settings["planning"].as_str().map(str::to_owned);
        let policy = policy_of(&settings, self.format.rules())?;
        let max_turns = settings["max_turns"]
            .as_u64()
            .map_or(30, |n| u32::try_from(n).unwrap_or(u32::MAX))
            .max(1);
        let max_tool_calls = settings["max_tool_calls"]
            .as_u64()
            .map_or(100, |n| u32::try_from(n).unwrap_or(u32::MAX));
        // Same stable prefix as `propose`, with the attempt policy in front;
        // a retry's digest goes after it, so the cached prefix is shared.
        let label = conversation_label(&input);
        let raw = input.peek().clone();
        let prompt = provenance::labelled_prompt(
            {
                let input = raw;
                let mut p = layout(
                    &input["bundle"],
                    ttl,
                    style,
                    &self::policy(self.format.wording()),
                    self.format,
                );
                let given: Vec<crate::instructions::Instruction> =
                    serde_json::from_value(input["instructions"].clone()).unwrap_or_default();
                if let Some(text) = crate::instructions::section(&given) {
                    let (key, kind) = match style {
                        PromptStyle::OpenAi => ("input", "input_text"),
                        PromptStyle::Anthropic | PromptStyle::Chat | PromptStyle::Parts { .. } => {
                            ("messages", "text")
                        }
                    };
                    if let Some(content) = p[key][0]["content"].as_array_mut() {
                        content.push(json!({ "type": kind, "text": text }));
                    }
                }
                if let Some(text) = input["test_layout"].as_str().filter(|t| !t.is_empty()) {
                    let (key, kind) = match style {
                        PromptStyle::OpenAi => ("input", "input_text"),
                        PromptStyle::Anthropic | PromptStyle::Chat | PromptStyle::Parts { .. } => {
                            ("messages", "text")
                        }
                    };
                    if let Some(content) = p[key][0]["content"].as_array_mut() {
                        content.push(json!({ "type": kind, "text": text }));
                    }
                }
                if !input["digest"].is_null() {
                    let (key, kind) = match style {
                        PromptStyle::OpenAi => ("input", "input_text"),
                        PromptStyle::Anthropic | PromptStyle::Chat | PromptStyle::Parts { .. } => {
                            ("messages", "text")
                        }
                    };
                    if let Some(content) = p[key][0]["content"].as_array_mut() {
                        content
                            .push(json!({ "type": kind, "text": digest_text(&input["digest"]) }));
                    }
                }
                // A planning task: where its documents go.
                if let Some(dir) = &planning {
                    let (key, kind) = match style {
                        PromptStyle::OpenAi => ("input", "input_text"),
                        PromptStyle::Anthropic | PromptStyle::Chat | PromptStyle::Parts { .. } => {
                            ("messages", "text")
                        }
                    };
                    let text = format!(
                        "# A planning task\n\nThis task writes design documents, not code: write them under `{dir}/` (the plan, contracts, the data model, research and the like are yours to write there). The requirements, the task list and the person's review stay protected, as does everything else of the spec; change no source code. speccoder runs the checks afterwards.\n"
                    );
                    if let Some(content) = p[key][0]["content"].as_array_mut() {
                        content.push(json!({ "type": kind, "text": text }));
                    }
                }
                // The checks as configured: the commands that run without asking.
                let checks: Vec<String> = argvs(&input["settings"]["checks"])
                    .iter()
                    .map(|argv| format!("- `{}`", json!(argv)))
                    .collect();
                if !checks.is_empty() {
                    let (key, kind) = match style {
                        PromptStyle::OpenAi => ("input", "input_text"),
                        PromptStyle::Anthropic | PromptStyle::Chat | PromptStyle::Parts { .. } => {
                            ("messages", "text")
                        }
                    };
                    let text = format!(
                        "# The checks\n\nRun them with run_command as these argvs, word for word; they need no approval:\n\n{}\n",
                        checks.join("\n")
                    );
                    if let Some(content) = p[key][0]["content"].as_array_mut() {
                        content.push(json!({ "type": kind, "text": text }));
                    }
                }
                // A person's notes for this task.
                let notes: Vec<String> = input["settings"]["nudges"]
                    .as_array()
                    .map(|a| {
                        a.iter()
                            .filter_map(|n| n.as_str().map(|n| format!("- {n}")))
                            .collect()
                    })
                    .unwrap_or_default();
                if !notes.is_empty() {
                    let (key, kind) = match style {
                        PromptStyle::OpenAi => ("input", "input_text"),
                        PromptStyle::Anthropic | PromptStyle::Chat | PromptStyle::Parts { .. } => {
                            ("messages", "text")
                        }
                    };
                    let text = format!("# Notes from a person\n\n{}\n", notes.join("\n"));
                    if let Some(content) = p[key][0]["content"].as_array_mut() {
                        content.push(json!({ "type": kind, "text": text }));
                    }
                }
                // A person's rejections, so the model does not ask again.
                if !told.is_empty() {
                    let (key, kind) = match style {
                        PromptStyle::OpenAi => ("input", "input_text"),
                        PromptStyle::Anthropic | PromptStyle::Chat | PromptStyle::Parts { .. } => {
                            ("messages", "text")
                        }
                    };
                    let lines: Vec<String> = told
                        .iter()
                        .map(|r| format!("- {}: {}", r.object.describe(), r.reason))
                        .collect();
                    let text = format!(
                        "# Rejected by a person\n\nThese calls were rejected for this task; find another way or call report_blocked:\n\n{}\n",
                        lines.join("\n")
                    );
                    if let Some(content) = p[key][0]["content"].as_array_mut() {
                        content.push(json!({ "type": kind, "text": text }));
                    }
                }
                if let PromptStyle::Parts { caches } = style {
                    super::model_config::to_parts(&mut p, caches);
                }
                p
            },
            &label,
        );
        let mut tools = crate::tools::declarations();
        tools.push(report_blocked());
        // MCP tools the policy does not deny, as the journaled input lists them.
        let routes: Vec<(String, String, String)> = mcp
            .iter()
            .filter(|t| t.decision != "deny")
            .map(|t| (t.name.clone(), t.server.clone(), t.tool.clone()))
            .collect();
        tools.extend(mcp.iter().filter(|t| t.decision != "deny").map(|t| {
            ToolDeclaration::new(t.name.clone(), t.description.clone(), t.schema.clone())
        }));
        // Journaled: whether this attempt asks inline decides its effects.
        let ask = Asker::from_settings(
            &settings,
            task_name.clone(),
            input.peek()["bundle"]["task"]["title"]
                .as_str()
                .unwrap_or_default()
                .to_owned(),
            PresentContext {
                root: settings["root"].as_str().map(std::path::PathBuf::from),
                ..self.present.clone()
            },
        );
        let remembered: Vec<Object> = decisions_of(&settings, "run_approved")?;
        let once: Vec<Object> = decisions_of(&settings, "approved_once")?;
        // Untrusted text the prompt itself carries.
        let mut parts = Vec::new();
        let given: Vec<crate::instructions::Instruction> =
            serde_json::from_value(input.peek()["instructions"].clone()).unwrap_or_default();
        if let Some(text) = crate::instructions::section(&given) {
            parts.push(crate::approvals::derived::Part {
                from: provenance::WORKTREE.to_owned(),
                turn: 0,
                text,
            });
        }
        if !input.peek()["digest"].is_null() {
            parts.push(crate::approvals::derived::Part {
                from: provenance::VERIFIER.to_owned(),
                turn: 0,
                text: crate::approvals::derived::text_of(&input.peek()["digest"]),
            });
        }
        let number = |k: &str, d: u32| {
            settings[k]
                .as_u64()
                .map_or(d, |n| u32::try_from(n).unwrap_or(u32::MAX))
        };
        tool_loop(
            cx,
            &prompt,
            LoopSpec {
                tools,
                policy,
                max_turns,
                max_tool_calls,
                reasoning: settings["reasoning"] == true,
                schema: Some(report_schema()),
                max_tokens: None,
                left: serde_json::from_value(settings["left"].clone()).ok(),
                reads: None,
                halt: None,
                routes,
                root: settings["root"].as_str().map(str::to_owned),
                frozen_additions: settings["frozen_additions"] == true,
                ask,
                run_approved: remembered,
                once,
                run: settings["run_id"].as_str().map(str::to_owned),
                asking: Asking {
                    asked: number("asked", 0),
                    budget: number("budget", DEFAULT_BUDGET),
                    prompts: settings["prompts"] == true,
                },
                parts,
                mcp_digests: mcp
                    .iter()
                    .map(|t| (t.name.clone(), t.digest.clone()))
                    .collect(),
                stop,
                observer: self.progress.clone().map(|p| {
                    (
                        task_name.rsplit('/').next().unwrap_or_default().to_owned(),
                        p,
                    )
                }),
                finish: |report| {
                    // The model's own word that it did not finish is believed;
                    // its word that it did is not (the verifier decides that).
                    if report["status"] == "incomplete" {
                        "incomplete"
                    } else {
                        "completed"
                    }
                },
            },
        )
        .await
    }
}

/// Turns an absolute `path` argument inside the workspace `root` into a
/// workspace-relative one. Tools print absolute paths (Spec Kit's scripts
/// do), and a model passes them on; outside the root a path stays as it is
/// — and the policy refuses it.
fn relativise(arguments: &mut Value, root: Option<&str>) {
    let (Some(root), Some(path)) = (root, arguments.get("path").and_then(Value::as_str)) else {
        return;
    };
    let root = root.trim_end_matches('/');
    if let Some(rel) = path.strip_prefix(root).and_then(|r| r.strip_prefix('/')) {
        let rel = if rel.is_empty() {
            ".".to_owned()
        } else {
            rel.to_owned()
        };
        arguments["path"] = Value::String(rel);
    }
}

/// Reports one logged tool call to whoever watches.
fn emit(
    observer: Option<&(String, std::sync::Arc<dyn crate::progress::Progress>)>,
    turn: u32,
    entry: &Value,
) {
    emit_with_tail(observer, turn, entry, Vec::new());
}

/// [`emit`] with the last lines of a failed command's output (live only,
/// never journaled).
fn emit_with_tail(
    observer: Option<&(String, std::sync::Arc<dyn crate::progress::Progress>)>,
    turn: u32,
    entry: &Value,
    tail: Vec<String>,
) {
    if let Some((task, p)) = observer {
        let tool = entry["tool"].as_str().unwrap_or_default();
        p.event(&crate::progress::Event::ToolCall {
            task: task.clone(),
            turn,
            tool: tool.to_owned(),
            target: crate::progress::target(tool, &entry["arguments"]),
            decision: entry["decision"].as_str().unwrap_or_default().to_owned(),
            ok: entry["ok"].as_bool(),
            tail,
            contained: entry["contained"] == true,
        });
    }
}

/// A person is needed for `asked`: the run tells whoever watches.
fn needs_person(
    observer: Option<&(String, std::sync::Arc<dyn crate::progress::Progress>)>,
    asked: &agentplane::model::ToolCall,
    object: Option<&Object>,
) {
    if let Some((task, p)) = observer {
        let (tool, arguments) = (asked.name.as_str(), &asked.arguments);
        let target = crate::progress::target(tool, arguments);
        let what: String = format!("{tool} {target}")
            .chars()
            .filter(|c| !c.is_control())
            .take(60)
            .collect();
        p.event(&crate::progress::Event::ApprovalRequested {
            task: task.clone(),
            call: asked.id.clone(),
            tool: tool.to_owned(),
            what,
            class: object
                .map(|o| o.class().as_str().to_owned())
                .unwrap_or_default(),
            object: object.map(Object::short).unwrap_or_default(),
        });
    }
}

/// A person decided `asked`: the run tells whoever watches.
fn person_decided(
    observer: Option<&(String, std::sync::Arc<dyn crate::progress::Progress>)>,
    asked: &agentplane::model::ToolCall,
    decision: &str,
    scope: Option<&str>,
    who: Option<&Who>,
    object: Option<&Object>,
) {
    if let Some((task, p)) = observer {
        p.event(&crate::progress::Event::ApprovalDecided {
            task: task.clone(),
            call: asked.id.clone(),
            decision: decision.to_owned(),
            scope: scope.map(str::to_owned),
            by: who.map_or_else(|| "nobody (expired)".to_owned(), |w| w.name.clone()),
            how: who.map_or_else(|| "expired".to_owned(), |w| w.basis.clone()),
            class: object
                .map(|o| o.class().as_str().to_owned())
                .unwrap_or_default(),
            object: object.map(Object::short).unwrap_or_default(),
        });
    }
}

/// What a call needing a person is asked by.
struct Question<'a> {
    asked: &'a agentplane::model::ToolCall,
    reason: &'a str,
    turn: u32,
    said: &'a str,
    asker: Option<&'a Asker>,
    policy: &'a Policy,
    object: Option<&'a Object>,
    remembered: &'a [(Object, &'static str)],
    parts: &'a [crate::approvals::derived::Part],
    run: Option<&'a str>,
}

/// The journaled question for a call needing a person: its object, what
/// changed since an approval of the same name, where its arguments were
/// copied from, and the choices that leaves — all from journaled data.
fn question(q: &Question<'_>) -> Request {
    let (tool, arguments) = (q.asked.name.as_str(), &q.asked.arguments);
    let kind = crate::approvals::kind_of(tool, arguments);
    let risk = crate::approvals::risk(tool, q.reason);
    // Always Allow commits an exact entry: judged without the network.
    let always_risk = if kind == "network" {
        let mut bare = arguments.clone();
        if let Some(o) = bare.as_object_mut() {
            o.remove("network");
        }
        match q.policy.base(tool, &bare) {
            Decision::Allow => "low",
            Decision::Approval(r) => crate::approvals::risk(tool, &r),
            Decision::Deny(_) => "high",
        }
    } else {
        risk
    };
    let (sources, more) = crate::approvals::derived::sources(tool, arguments, q.parts);
    let changed = q.object.and_then(|o| {
        q.remembered
            .iter()
            .map(|(r, _)| r)
            .chain(q.policy.approved())
            .find_map(|earlier| o.changed_from(earlier))
    });
    Request {
        task: q.asker.map(|a| a.task.clone()).unwrap_or_default(),
        task_title: q.asker.map(|a| a.task_title.clone()).unwrap_or_default(),
        turn: q.turn,
        tool: tool.to_owned(),
        arguments: arguments.clone(),
        kind: kind.to_owned(),
        reason: q.reason.to_owned(),
        object: q.object.cloned(),
        changed,
        risk: risk.to_owned(),
        claim: crate::approvals::claim(q.said),
        options: crate::approvals::options(
            risk,
            q.object.is_some(),
            !sources.is_empty(),
            kind,
            always_risk,
        ),
        sources,
        more,
        run: q.run.map(str::to_owned),
        asked: 0,
        budget: 0,
        batched: false,
    }
}

/// What a governed tool loop offers the model and asks of it.
pub(crate) struct LoopSpec {
    /// The tools declared to the model; any other name is refused.
    pub tools: Vec<ToolDeclaration>,
    /// Classifies every call before dispatch.
    pub policy: Policy,
    /// Model turns.
    pub max_turns: u32,
    /// Tool calls.
    pub max_tool_calls: u32,
    /// Ask each turn for the model's reasoning summary.
    pub reasoning: bool,
    /// The closing answer's schema; `None`: a text answer ends the turn.
    pub schema: Option<Value>,
    /// Declared tools served elsewhere: (name, server, tool) — MCP.
    pub routes: Vec<(String, String, String)>,
    /// The workspace's absolute path, from the journaled input: absolute
    /// paths inside it are made relative before the policy sees them.
    pub root: Option<String>,
    /// A write to a frozen test that only adds lines needs no approval.
    pub frozen_additions: bool,
    /// The status for a closing answer.
    pub finish: fn(&Value) -> &'static str,
    /// Ask a person instead of stopping when a call needs approval.
    pub ask: Option<Asker>,
    /// Objects a person approved for this run: allowed without asking.
    pub run_approved: Vec<Object>,
    /// Objects a person approved for one call each: the first call of
    /// each is allowed without asking, later ones ask again.
    pub once: Vec<Object>,
    /// Live progress: the task ID and where to report.
    pub observer: Option<(String, std::sync::Arc<dyn crate::progress::Progress>)>,
    /// The run the attempt belongs to (`run-<secs>-<hex>`).
    pub run: Option<String>,
    /// How a run asks: its count so far, its budget and whether a person is
    /// prompted at all.
    pub asking: Asking,
    /// Untrusted content the prompt carries (inlined worktree text, the
    /// verifier's digest): what derived arguments are found in.
    pub parts: Vec<crate::approvals::derived::Part>,
    /// MCP tools' digests by model-facing name: their objects.
    pub mcp_digests: std::collections::BTreeMap<String, String>,
    /// What a `report_blocked` call's evidence is checked against.
    pub stop: StopGate,
    /// Tokens a turn may use (Ask); `None`: the plane's budget alone.
    pub max_tokens: Option<u64>,
    /// What is left of the run's cap for this attempt.
    pub left: Option<Left>,
    /// The first read id to issue (`r<n>`), when the answer cites reads.
    pub reads: Option<u32>,
    /// Pressed when a person stops the turn (Ask): the model call streaming
    /// ends where it is (a recorded, metered completion) and none of its
    /// calls run. Not effect identity — replay returns the recorded call.
    pub halt: Option<agentplane::model::Stop>,
}

/// A run's asking budget as an attempt sees it (all journaled).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Asking {
    /// Prompts shown to a person in the run so far.
    pub asked: u32,
    /// `[approvals] budget`: at most this many per run.
    pub budget: u32,
    /// A person is prompted inline; `false` with `--no-prompt` (calls wait
    /// as ordinary approvals, nothing is counted).
    pub prompts: bool,
}

impl Default for Asking {
    fn default() -> Self {
        Self {
            asked: 0,
            budget: DEFAULT_BUDGET,
            prompts: false,
        }
    }
}

/// `[approvals] budget` unless configured.
pub use super::run_config::DEFAULT_BUDGET;

/// What is left of the run's cap for one attempt, and the prices a dollar
/// cap is counted at (journaled with the attempt's settings).
#[derive(Debug, Clone, Copy, PartialEq, serde::Serialize, serde::Deserialize)]
pub struct Left {
    /// Tokens or dollars left.
    pub cap: super::run_config::Cap,
    /// `[model]`'s prices; a dollar cap is refused without them.
    pub prices: Option<super::model_config::Prices>,
}

impl Left {
    /// What `usage` spent, in the cap's own unit (tokens, or millionths of a dollar).
    #[must_use]
    pub fn spent(&self, usage: &agentplane::model::Usage) -> u64 {
        match self.cap {
            super::run_config::Cap::Tokens(_) => usage.input_tokens + usage.output_tokens,
            super::run_config::Cap::Usd(_) => self.prices.map_or(0, |p| {
                micros(p.usd(
                    usage.input_tokens,
                    usage.output_tokens,
                    usage.cache_read_tokens,
                    usage.cache_write_tokens,
                ))
            }),
        }
    }

    /// Whether `usage` used all that is left.
    #[must_use]
    pub fn reached(&self, usage: &agentplane::model::Usage) -> bool {
        self.spent(usage) >= self.cap.amount()
    }

    /// The stop's words: what the attempt used of what was left.
    #[must_use]
    pub fn reason(&self, usage: &agentplane::model::Usage) -> String {
        format!(
            "the run's cap: this attempt used {} of the {} left (`run --cap`, `[budget] cap`)",
            self.cap.with(self.spent(usage)).rounded(),
            self.cap.rounded()
        )
    }
}

/// A recorded usage object (`input_tokens`, …) as the model's usage.
#[must_use]
pub fn usage_of(v: Option<&Value>) -> agentplane::model::Usage {
    let n = |k: &str| v.and_then(|v| v[k].as_u64()).unwrap_or(0);
    agentplane::model::Usage {
        input_tokens: n("input_tokens"),
        output_tokens: n("output_tokens"),
        cache_read_tokens: n("cache_read_tokens"),
        cache_write_tokens: n("cache_write_tokens"),
        ..agentplane::model::Usage::default()
    }
}

/// Dollars as millionths, rounded.
#[must_use]
#[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
pub fn micros(usd: f64) -> u64 {
    (usd * 1e6).round().max(0.0) as u64
}

/// The governed tool loop shared by attempts and convergence: every call is
/// classified first (deny → refused and told; approval → stop; allow →
/// dispatched through agentplane); the closing structured answer ends it.
pub(crate) async fn tool_loop(
    cx: &mut StepCtx<'_>,
    prompt: &Tainted<Value>,
    spec: LoopSpec,
) -> Result<Outcome, SkillError> {
    // What the conversation has read, with its labels: agentplane checks
    // every model call against the join.
    let mut transcript = Transcript::new(prompt);
    tool_turn(cx, prompt, spec, &mut transcript).await
}

/// [`tool_loop`] continuing a conversation the caller holds: Ask's turns
/// share one transcript, each person's message told before the turn.
pub(crate) async fn tool_turn(
    cx: &mut StepCtx<'_>,
    prompt: &Tainted<Value>,
    spec: LoopSpec,
    transcript: &mut Transcript,
) -> Result<Outcome, SkillError> {
    let LoopSpec {
        tools,
        policy,
        max_turns,
        max_tool_calls,
        reasoning,
        schema,
        routes,
        root,
        frozen_additions,
        finish,
        ask,
        run_approved,
        mut once,
        observer,
        run,
        asking,
        mut parts,
        mcp_digests,
        stop,
        max_tokens,
        left,
        reads,
        halt,
    } = spec;
    // What an earlier pass already showed is not shown again: after a
    // person's answer the run is invoked again and every journaled call
    // returns again (set after each journaled step, from `cx.replaying()`).
    let replaying = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(cx.replaying()));
    let observer = observer.map(|(task, next)| {
        let quiet: std::sync::Arc<dyn crate::progress::Progress> = std::sync::Arc::new(Quiet {
            replaying: std::sync::Arc::clone(&replaying),
            next,
        });
        (task, quiet)
    });
    let seen = |cx: &StepCtx<'_>| {
        replaying.store(cx.replaying(), std::sync::atomic::Ordering::SeqCst);
    };
    // The next read id this turn issues, when reads are cited.
    let mut next_read = reads;
    let mut proposed = false;
    // Objects allowed without asking: this run's, then what a person
    // answered "for the task" or "for this run" in this attempt.
    let mut remembered: Vec<(Object, &'static str)> =
        run_approved.into_iter().map(|g| (g, "run-grant")).collect();
    let mut prompted = asking.asked;
    let mut told_budget = false;
    let catalog = crate::tools::catalog();

    let mut conversation: Label = transcript.label().clone();
    let mut calls = 0u32;
    let mut denied_in_a_row = 0u32;
    // Whether the model was asked once before a stop.
    let mut asked_to_stop = false;
    // Whether this attempt registered the `approval` obligation yet.
    let mut obligation = false;
    let mut usage = agentplane::model::Usage::default();
    let mut log: Vec<Value> = Vec::new();

    let end = |status: &str,
               extra: Value,
               log: &[Value],
               usage: agentplane::model::Usage,
               conversation: &Label,
               prompted: u32| {
        let mut out = json!({
            "status": status,
            "tool_calls": log,
            "asked": prompted,
            "usage": {
                "input_tokens": usage.input_tokens,
                "output_tokens": usage.output_tokens,
                "cache_read_tokens": usage.cache_read_tokens,
                "cache_write_tokens": usage.cache_write_tokens,
            },
        });
        if let (Some(o), Some(e)) = (out.as_object_mut(), extra.as_object()) {
            o.extend(e.clone());
        }
        Ok(Outcome::done(Tainted::with_label(
            out,
            conversation.clone(),
        )))
    };

    for turn in 0..max_turns {
        // A turn's own token limit, checked before each call.
        if let Some(max) = max_tokens
            && usage.input_tokens + usage.output_tokens >= max
        {
            return end(
                "budget",
                json!({ "reason": format!("this turn used {} of its {max} tokens", usage.input_tokens + usage.output_tokens) }),
                &log,
                usage,
                &conversation,
                prompted,
            );
        }
        // The run's cap: what is left of it, checked before each call.
        if let Some(l) = left
            && l.reached(&usage)
        {
            return end(
                "budget_exhausted",
                json!({ "reason": l.reason(&usage) }),
                &log,
                usage,
                &conversation,
                prompted,
            );
        }
        // The prompt was built from labelled parts (`/system` is speccoder's
        // constant instruction); what the conversation read since rides in
        // the transcript, so the request is labelled by its real sources.
        let tools_now = tools.clone();
        let schema_now = schema.clone();
        let read_so_far = &*transcript;
        let stop_now = halt.clone();
        let completion = cx
            .complete_with(prompt, move |call| {
                let call = call.with_tools(tools_now).continuing(read_so_far);
                let call = match stop_now {
                    Some(stop) => call.stopped_by(stop),
                    None => call,
                };
                let call = match schema_now {
                    Some(schema) => call.expecting(schema),
                    None => call,
                };
                if reasoning {
                    call.with_reasoning_summary()
                } else {
                    call
                }
            })
            .await?;
        seen(cx);
        conversation = transcript.label().join(completion.label());
        usage = usage.plus(completion.peek().usage);
        if let Some((task, p)) = &observer {
            p.event(&crate::progress::Event::Usage {
                task: task.clone(),
                input_tokens: usage.input_tokens,
                output_tokens: usage.output_tokens,
                cache_read_tokens: usage.cache_read_tokens,
                cache_write_tokens: usage.cache_write_tokens,
                usd: None,
            });
        }

        // The model's summary of its reasoning, when asked and given: its
        // account of why, a claim like its words.
        if let (Some((task, p)), Some(reasoning)) =
            (&observer, completion.peek().reasoning.as_deref())
            && !reasoning.trim().is_empty()
        {
            let text: String = crate::approvals::present::escape(reasoning.trim())
                .chars()
                .take(4000)
                .collect();
            p.event(&crate::progress::Event::Reasoning {
                task: task.clone(),
                turn: turn + 1,
                text,
            });
        }
        if completion.peek().stopped
            || halt
                .as_ref()
                .is_some_and(agentplane::model::Stop::is_stopped)
        {
            return end(
                "stopped",
                json!({ "text": completion.peek().text }),
                &log,
                usage,
                &conversation,
                prompted,
            );
        }
        if completion.peek().truncated {
            return Ok(Outcome::fail(
                "the model ran out of output budget mid-turn; nothing it was still writing was executed — raise [model] max_output_tokens",
            ));
        }
        let asked_calls = transcript.asked(&completion);
        // The model's own words beside its calls, live: its account, a
        // claim. A turn without calls is its final answer, reported as such;
        // its commentary, where the provider marks one, is still words.
        let said = super::said(completion.peek());
        if let (Some((task, p)), Some(said)) = (observer.as_ref(), said.as_deref()) {
            let text: String = crate::approvals::present::escape(said)
                .chars()
                .take(2000)
                .collect();
            p.event(&crate::progress::Event::Said {
                task: task.clone(),
                turn: turn + 1,
                text,
            });
        }
        if asked_calls.is_empty() && schema.is_none() {
            return end(
                "answered",
                json!({ "text": completion.peek().text }),
                &log,
                usage,
                &conversation,
                prompted,
            );
        }
        if asked_calls.is_empty() {
            let report = completion
                .peek()
                .structured
                .clone()
                .unwrap_or_else(|| json!({ "summary": completion.peek().text, "status": "incomplete", "files_changed": [], "checks_run": [], "notes": ["the answer was not the requested structure"] }));
            let status = finish(&report);
            return end(
                status,
                json!({ "report": report }),
                &log,
                usage,
                &conversation,
                prompted,
            );
        }

        for mut asked in asked_calls {
            relativise(&mut asked.arguments, root.as_deref());
            // Only speccoder sets the object a call is checked against.
            if let Some(o) = asked.arguments.as_object_mut() {
                o.remove(crate::tools::EXPECT);
            }
            calls += 1;
            if calls > max_tool_calls {
                return end(
                    "budget_exhausted",
                    json!({ "reason": format!("more than {max_tool_calls} tool calls (`[budget] max_tool_calls`)") }),
                    &log,
                    usage,
                    &conversation,
                    prompted,
                );
            }
            if asked.name == ASK_PERSON && tools.iter().any(|t| t.name == ASK_PERSON) {
                let question = asked.arguments["question"]
                    .as_str()
                    .unwrap_or_default()
                    .to_owned();
                // A person's answer is their input, recorded with who gave it
                // — never speccoder's own trusted text.
                let decided = match &ask {
                    Some(asker) => Some(
                        wait_for_person(
                            cx,
                            asker,
                            &mut obligation,
                            &crate::approvals::tasks::question_task(&asker.task, &question),
                        )
                        .await?,
                    ),
                    None => None,
                };
                let read = decided.as_ref().map(crate::approvals::tasks::read);
                let by = read.as_ref().and_then(|r| r.by.clone());
                let entry = json!({
                    "tool": ASK_PERSON,
                    "arguments": asked.arguments,
                    "decision": "allow",
                    "answered": read.as_ref().is_some_and(|r| r.text.is_some()),
                    // The person's words, as the record of what they said.
                    "answer": read.as_ref().and_then(|r| r.text.clone()),
                    "operator": by.as_ref().map(Who::view),
                    "via": by.as_ref().map(|w| w.via.clone()),
                });
                emit(observer.as_ref(), turn + 1, &entry);
                log.push(entry);
                let text = match (&read, &by) {
                    (Some(r), _) if r.text.is_some() => r.text.clone().unwrap_or_default(),
                    (Some(_), Some(w)) => format!("{} declined to answer.", w.name),
                    _ => "Nobody can answer now. Record the question in the artifact as [NEEDS CLARIFICATION: <question>] and continue.".to_owned(),
                };
                let label = match &by {
                    Some(_) => provenance::from(provenance::PERSON),
                    None => Label::trusted(),
                };
                transcript.answered(
                    asked,
                    &Tainted::with_label(json!({ "answer": text }), label),
                );
                continue;
            }
            if asked.name == REPORT_BLOCKED && tools.iter().any(|t| t.name == REPORT_BLOCKED) {
                let refused = stop.rejected || log.iter().any(|e| e["decision"] == "deny");
                let left = max_turns - turn - 1;
                match judge_stop(&stop, &asked.arguments, refused, asked_to_stop, left) {
                    Stop::Stopped(reason) => {
                        let entry = json!({ "tool": REPORT_BLOCKED, "arguments": asked.arguments, "decision": "stop" });
                        emit(observer.as_ref(), turn + 1, &entry);
                        log.push(entry);
                        return end(
                            "blocked",
                            json!({ "reason": reason }),
                            &log,
                            usage,
                            &conversation,
                            prompted,
                        );
                    }
                    Stop::Asked(text) => {
                        asked_to_stop = true;
                        let entry = json!({ "tool": REPORT_BLOCKED, "arguments": asked.arguments, "decision": "challenged" });
                        emit(observer.as_ref(), turn + 1, &entry);
                        log.push(entry);
                        transcript.answered(
                            asked,
                            &Tainted::trusted(json!({ "stopped": false, "note": text })),
                        );
                    }
                    Stop::Refused(text) => {
                        let entry = json!({ "tool": REPORT_BLOCKED, "arguments": asked.arguments, "decision": "unproven", "reason": text });
                        emit(observer.as_ref(), turn + 1, &entry);
                        log.push(entry);
                        transcript.failed(asked, Tainted::trusted(text));
                    }
                }
                continue;
            }
            if asked.name == crate::ask::PROPOSE && tools.iter().any(|t| t.name == asked.name) {
                // A suggestion for the person: nothing runs, one per turn.
                let entry = json!({ "tool": asked.name, "arguments": asked.arguments, "decision": if proposed { "deny" } else { "proposed" } });
                emit(observer.as_ref(), turn + 1, &entry);
                log.push(entry);
                if proposed {
                    transcript.failed(
                        asked,
                        Tainted::trusted(
                            "one proposal per turn; this one was not shown".to_owned(),
                        ),
                    );
                } else {
                    proposed = true;
                    transcript.answered(asked, &Tainted::trusted(json!({ "shown": true, "note": "shown to the person as a sheet; nothing ran, and only the person can confirm it" })));
                }
                continue;
            }
            let declared = tools.iter().any(|t| t.name == asked.name);
            let target = catalog
                .iter()
                .find(|t| declared && t.name == asked.name)
                .map(|t| ToolId::new(t.server, t.name))
                .or_else(|| {
                    routes
                        .iter()
                        .find(|(n, _, _)| declared && *n == asked.name)
                        .map(|(_, server, tool)| ToolId::new(server, tool))
                });
            let Some(target) = target else {
                let entry = json!({ "tool": asked.name, "arguments": asked.arguments, "decision": "unknown" });
                emit(observer.as_ref(), turn + 1, &entry);
                log.push(entry);
                transcript.failed(asked, Tainted::trusted("no tool of that name".to_owned()));
                continue;
            };
            let mut decision = policy.base(&asked.name, &asked.arguments);
            // `[tests] frozen = "additions"`: read the frozen test (a
            // journaled call, so replay sees the same content) and allow a
            // write that keeps every existing line.
            let mut additions_only = false;
            if frozen_additions
                && matches!(&decision, Decision::Approval(r) if r.contains("frozen test"))
            {
                let path = asked.arguments["path"]
                    .as_str()
                    .unwrap_or_default()
                    .to_owned();
                let read = cx
                    .call_tool(
                        ToolId::new("fs", "read_file"),
                        Tainted::with_label(json!({ "path": path }), completion.label().clone()),
                    )
                    .await?;
                seen(cx);
                let current = read.peek().clone();
                // `read_file` joins lines with `\n`; the file's last newline is
                // restored so an edit's `old_string` matches as on disk.
                let lines = current["content"].as_str().unwrap_or_default();
                let old_text = if lines.is_empty() {
                    String::new()
                } else {
                    format!("{lines}\n")
                };
                let old = old_text.as_str();
                let readable = current["ok"] == true && current["truncated"] != true;
                let new = match asked.name.as_str() {
                    "write_file" => asked.arguments["content"].as_str().map(str::to_owned),
                    "edit_file" => {
                        let (from, to) = (
                            asked.arguments["old_string"].as_str().unwrap_or_default(),
                            asked.arguments["new_string"].as_str().unwrap_or_default(),
                        );
                        let all = asked.arguments["replace_all"] == true;
                        (!from.is_empty() && (all || old.matches(from).count() == 1))
                            .then(|| old.replace(from, to))
                    }
                    _ => None,
                };
                if readable && new.is_some_and(|n| crate::integrity::only_additions(old, &n)) {
                    decision = Decision::Allow;
                    additions_only = true;
                }
            }
            // A person would be needed: the object the call reaches is
            // resolved by a journaled step (replay reads the same object
            // back), and only a decision on that very object applies.
            let mut object: Option<Object> = None;
            if matches!(decision, Decision::Approval(_)) {
                if asked.name.starts_with(crate::mcp::PREFIX) {
                    object = mcp_digests.get(&asked.name).map(|digest| Object::Tool {
                        name: asked.name.clone(),
                        digest: digest.clone(),
                    });
                } else {
                    let resolved = cx
                        .call_tool(
                            ToolId::new("fs", "resolve"),
                            Tainted::with_label(
                                json!({ "tool": asked.name, "arguments": asked.arguments }),
                                completion.label().clone(),
                            ),
                        )
                        .await?;
                    seen(cx);
                    let out = resolved.peek();
                    if out["ok"] == true {
                        object = serde_json::from_value(out["object"].clone()).ok();
                    } else {
                        decision = Decision::Deny(
                            out["error"]
                                .as_str()
                                .unwrap_or("the call's object cannot be resolved")
                                .to_owned(),
                        );
                    }
                }
                if matches!(decision, Decision::Approval(_)) {
                    decision = policy.classify(&asked.name, &asked.arguments, object.as_ref());
                }
            }
            let mut person: Option<Value> = None;
            // Allowed by a person's grant for the task (of this run): the
            // person's decision, not a rule's (a contained call is a rule's).
            if decision == Decision::Allow
                && object
                    .as_ref()
                    .is_some_and(|o| policy.approved().contains(o))
            {
                person = Some(json!({
                    "approved_by": "person",
                    "scope": "task-grant",
                    "grant": { "scope": "task", "run": run },
                }));
            }
            let mut note: Option<String> = None;
            // An object a person approved for one call: this one.
            if matches!(decision, Decision::Approval(_))
                && let Some(at) = object
                    .as_ref()
                    .and_then(|o| once.iter().position(|r| r == o))
            {
                once.remove(at);
                person = Some(json!({
                    "approved_by": "person",
                    "scope": "once-grant",
                    "grant": { "scope": "once", "run": run },
                }));
                decision = Decision::Allow;
            }
            // An object a person already approved for this run or task.
            if matches!(decision, Decision::Approval(_))
                && let Some((_, scope)) = object
                    .as_ref()
                    .and_then(|o| remembered.iter().find(|(r, _)| r == o))
            {
                person = Some(json!({
                    "approved_by": "person",
                    "scope": scope,
                    "grant": { "scope": scope.trim_end_matches("-grant"), "run": run },
                }));
                decision = Decision::Allow;
            }
            // On autopilot nobody is asked: what would wait for a person is
            // refused for the run and listed for them afterwards.
            decision = policy.settle(decision);
            // Still a person's: the question, with everything it is decided by.
            let request = match &decision {
                Decision::Approval(reason) => Some(question(&Question {
                    asked: &asked,
                    reason,
                    turn: turn + 1,
                    said: said.as_deref().unwrap_or_default(),
                    asker: ask.as_ref(),
                    policy: &policy,
                    object: object.as_ref(),
                    remembered: &remembered,
                    parts: &parts,
                    run: run.as_deref(),
                })),
                _ => None,
            };
            // ask a person now, as a journaled effect, instead of stopping.
            if let (Some(mut request), Some(asker)) = (request.clone(), &ask) {
                // The run's asking budget: within it a person is prompted
                // (and counted, whatever they answer); past it the call
                // waits in the run's batch, nobody interrupted.
                if asking.prompts {
                    if prompted < asking.budget {
                        prompted += 1;
                        request.asked = prompted;
                    } else {
                        request.batched = true;
                    }
                    request.budget = asking.budget;
                }
                if request.batched {
                    // The batch item is created: the person is notified
                    // once; calls joining it notify no one.
                    if !told_budget {
                        needs_person(observer.as_ref(), &asked, object.as_ref());
                    }
                    if !told_budget && let Some((_, p)) = &observer {
                        p.event(&crate::progress::Event::Notice {
                            text: format!(
                                "approval budget ({}) reached: calls wait in Needs You (speccoder approvals)",
                                asking.budget
                            ),
                        });
                    }
                    told_budget = true;
                } else {
                    needs_person(observer.as_ref(), &asked, object.as_ref());
                }
                let decided = wait_for_person(
                    cx,
                    asker,
                    &mut obligation,
                    &crate::approvals::tasks::approval_task(&request, &log),
                )
                .await?;
                seen(cx);
                let read = crate::approvals::tasks::read(&decided);
                // A batch decision may start the run's asking again.
                if read.resume_asking {
                    prompted = 0;
                }
                let answer: Answer = read.answer.clone();
                // Who decided, and how that is known, is journaled with it.
                let approver = serde_json::to_value(&answer.by).unwrap_or(Value::Null);
                let operator = read.by.as_ref().map(Who::view);
                person_decided(
                    observer.as_ref(),
                    &asked,
                    if answer.decision == Said::Approve {
                        "approve"
                    } else {
                        "reject"
                    },
                    (answer.decision == Said::Approve).then(|| answer.scope.name()),
                    read.by.as_ref().filter(|_| !read.expired),
                    object.as_ref(),
                );
                match answer.decision {
                    Said::Approve => {
                        let mut p = json!({
                            "approved_by": "person",
                            "scope": answer.scope.name(),
                            "note": answer.note,
                            "approver": approver,
                            "operator": operator,
                        });
                        if answer.always {
                            p["always"] = json!(true);
                        }
                        if let (Some(o), Scope::Task | Scope::Run) = (&object, answer.scope) {
                            let remembered_as = if answer.scope == Scope::Run {
                                "run-grant"
                            } else {
                                "task-grant"
                            };
                            p["grant"] = json!({ "scope": answer.scope.name(), "run": run });
                            remembered.push((o.clone(), remembered_as));
                        }
                        person = Some(p);
                        note = answer.note;
                        decision = Decision::Allow;
                    }
                    // "Later" is a task left undecided: the run stays
                    // suspended and never reaches here.
                    Said::Reject | Said::Stop => {
                        let why = answer
                            .reason
                            .unwrap_or_else(|| "no reason given".to_owned());
                        person = Some(if read.expired {
                            json!({ "expired": true, "rejection": why })
                        } else {
                            json!({ "rejected_by": "person", "approver": approver, "operator": operator, "rejection": why })
                        });
                        decision = Decision::Deny(format!("a person rejected this: {why}"));
                    }
                }
            }
            // Who decided: a person (now, or by a grant they gave), or a rule
            // — named, so a rule's decision is never read as a person's.
            let rule = person
                .is_none()
                .then(|| policy.rule(&asked.name, &asked.arguments, object.as_ref()));
            let with_person = |mut entry: Value| {
                if let Some(o) = entry.as_object_mut() {
                    // The object decided on, whoever decided.
                    if let Some(obj) = &object {
                        o.insert("object".to_owned(), json!(obj));
                    }
                    match (person.as_ref().and_then(Value::as_object), &rule) {
                        (Some(p), _) => {
                            // An expiry is nobody's decision.
                            let by = if p.contains_key("expired") {
                                "expiry"
                            } else {
                                "person"
                            };
                            o.insert("by".to_owned(), json!(by));
                            o.extend(p.clone());
                        }
                        (None, Some(r)) => {
                            o.insert("by".to_owned(), json!("rule"));
                            o.insert("rule".to_owned(), json!(r));
                            // Ran without asking: the sandbox confined it.
                            if r.starts_with("contained (") {
                                o.insert("contained".to_owned(), json!(true));
                            }
                        }
                        (None, None) => {}
                    }
                }
                entry
            };
            match decision {
                Decision::Deny(reason) => {
                    let entry = with_person(
                        json!({ "tool": asked.name, "arguments": asked.arguments, "decision": "deny", "reason": reason }),
                    );
                    emit(observer.as_ref(), turn + 1, &entry);
                    log.push(entry);
                    // The reason quotes the call (its tool, path, command, or a
                    // person's words about it): it carries the call's label.
                    transcript.failed(
                        asked,
                        refusal(format!("denied: {reason}"), completion.label()),
                    );
                    // Escalation: a model that keeps asking for what it may
                    // not do is stopped for a person.
                    denied_in_a_row += 1;
                    if denied_in_a_row >= MAX_CONSECUTIVE_DENIALS {
                        return end(
                            "denied",
                            json!({ "reason": format!("{denied_in_a_row} calls in a row were denied; last: {reason}") }),
                            &log,
                            usage,
                            &conversation,
                            prompted,
                        );
                    }
                    continue;
                }
                Decision::Approval(reason) => {
                    let mut entry = json!({ "tool": asked.name, "arguments": asked.arguments, "decision": "approval", "reason": reason });
                    if let Some(obj) = &object {
                        entry["object"] = json!(obj);
                    }
                    emit(observer.as_ref(), turn + 1, &entry);
                    needs_person(observer.as_ref(), &asked, object.as_ref());
                    log.push(entry);
                    return end(
                        "needs_approval",
                        json!({ "pending": {
                            "tool": asked.name,
                            "arguments": asked.arguments,
                            "reason": reason,
                            "object": object,
                            "run": run,
                            "request": request,
                        } }),
                        &log,
                        usage,
                        &conversation,
                        prompted,
                    );
                }
                Decision::Allow => {
                    denied_in_a_row = 0;
                    // The arguments carry the model's label: agentplane's
                    // taint gate checks them against the grant's fields (an
                    // argument-less mutating tool is granted exactly `{}`).
                    // A command gets the call's id (`SPECCODER_CALL_ID`):
                    // a call resumed after a crash has the same one, so a
                    // script can tell a repeat from a new call.
                    let mut arguments = asked.arguments.clone();
                    if asked.name == "run_command"
                        && let Some(o) = arguments.as_object_mut()
                    {
                        o.insert("call_id".to_owned(), Value::String(asked.id.clone()));
                    }
                    // Decided on an object: the tool checks it again at
                    // use, and refuses when the call now reaches another.
                    if let (Some(obj), Some(o)) = (&object, arguments.as_object_mut())
                        && matches!(
                            asked.name.as_str(),
                            "write_file" | "edit_file" | "run_command"
                        )
                    {
                        o.insert(crate::tools::EXPECT.to_owned(), json!(obj));
                    }
                    let args = Tainted::with_label(arguments, completion.label().clone());
                    let result = cx.call_tool(target.clone(), args).await;
                    seen(cx);
                    let result = match result {
                        Ok(r) => r,
                        // A failure the far side reported is the model's to
                        // read, labelled by who wrote it.
                        Err(error) => match cx.relayed(&error) {
                            Some(detail) => {
                                let entry = with_person(
                                    json!({ "tool": asked.name, "arguments": asked.arguments, "decision": "allow", "ok": false }),
                                );
                                emit(observer.as_ref(), turn + 1, &entry);
                                log.push(entry);
                                transcript.failed(asked, detail);
                                continue;
                            }
                            None => return Err(error.into()),
                        },
                    };
                    let output = result.peek().clone();
                    let ok = output["ok"].as_bool() != Some(false);
                    let mut entry = with_person(
                        json!({ "tool": asked.name, "arguments": asked.arguments, "decision": "allow", "ok": ok }),
                    );
                    // A read the answer may cite: its id rides on the result.
                    let result = match next_read.as_mut() {
                        Some(n) if ok => {
                            let id = format!("r{n}");
                            *n += 1;
                            entry["read"] = json!(crate::ask::read_of(
                                &id,
                                &asked.name,
                                &asked.arguments,
                                &output
                            ));
                            result.map(|mut v| {
                                if let Some(o) = v.as_object_mut() {
                                    o.insert("read".to_owned(), json!(id));
                                }
                                v
                            })
                        }
                        _ => result,
                    };
                    if let Some(changed) = output["object_changed"].as_object() {
                        entry["decision"] = json!("refused_changed");
                        entry["expected"] = changed.get("expected").cloned().unwrap_or(Value::Null);
                        entry["found"] = changed.get("found").cloned().unwrap_or(Value::Null);
                    }
                    // What the tool returned is content the attempt read:
                    // arguments copied from it later are named as such.
                    if let Some(part) = crate::approvals::derived::part_of(
                        &asked.name,
                        &asked.arguments,
                        &output,
                        turn + 1,
                        &format!("tool://{}/{}", target.server, target.tool),
                        |p: &str| {
                            policy.protected().write_class(p)
                                == Some(crate::tools::paths::Class::Intent)
                        },
                    ) {
                        parts.push(part);
                    }
                    if additions_only {
                        entry["frozen_additions"] = json!(true);
                    }
                    let tail = if asked.name == "run_command" && !ok {
                        crate::progress::tail(&format!(
                            "{}\n{}",
                            output["stdout"].as_str().unwrap_or_default(),
                            output["stderr"].as_str().unwrap_or_default()
                        ))
                    } else {
                        Vec::new()
                    };
                    emit_with_tail(observer.as_ref(), turn + 1, &entry, tail);
                    log.push(entry);
                    // A command that changed a judge input ends the attempt
                    // before the model sees another turn.
                    if let Some(drift) = output["integrity"].as_array().filter(|d| !d.is_empty()) {
                        let paths: Vec<&str> =
                            drift.iter().filter_map(|d| d["path"].as_str()).collect();
                        return end(
                            "integrity",
                            json!({
                                "reason": format!("a command changed what judges the task: {}", paths.join(", ")),
                                "integrity": drift,
                            }),
                            &log,
                            usage,
                            &conversation,
                            prompted,
                        );
                    }
                    // A tool that refused (`error`) is a failed call; a
                    // command that ran and exited non-zero is a result the
                    // model must read in full — its stdout and stderr are
                    // the diagnostics (found by the first real evaluation,
                    // where the model saw only the word "failed").
                    match output["error"].as_str() {
                        Some(error) if !ok => transcript.failed(
                            asked,
                            Tainted::with_label(error.to_owned(), result.label().clone()),
                        ),
                        // A person's note rides with the result it approved.
                        _ => match &note {
                            Some(n) => {
                                let n = format!("Note from the person who approved this call: {n}");
                                transcript.answered(
                                    asked,
                                    &result.map(|mut v| {
                                        v["note_from_person"] = Value::String(n);
                                        v
                                    }),
                                );
                            }
                            None => transcript.answered(asked, &result),
                        },
                    }
                }
            }
        }
    }
    end(
        "budget_exhausted",
        json!({ "reason": format!("more than {max_turns} model turns (`[budget] max_turns`)") }),
        &log,
        usage,
        &conversation,
        prompted,
    )
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn labels_are_read_from_the_parts_and_refusals_carry_the_call() {
        use agentplane::core::{Label, SourceId};
        let model = Label::untrusted(SourceId::new("model:x/y"));
        // A refusal quoting the call is the call's; a constant is trusted.
        assert!(
            refusal("denied: `src/x` is protected".to_owned(), &model)
                .label()
                .is_untrusted()
        );
        // Parts labelled when admitted: the spec trusted, the digest the verifier's.
        let input = Tainted::object([
            ("bundle", Tainted::trusted(json!({}))),
            (
                "digest",
                Tainted::with_label(json!({}), provenance::from(provenance::VERIFIER)),
            ),
            (
                "settings",
                Tainted::object([("nudges", Tainted::trusted(json!([])))]),
            ),
        ]);
        let label = conversation_label(&input);
        assert!(
            label
                .provenance
                .contains(&SourceId::new(provenance::VERIFIER))
        );
        // No labels of its own: every part takes the whole input's (fails closed).
        let flat = Tainted::with_label(json!({ "bundle": {} }), model.clone());
        assert_eq!(conversation_label(&flat).provenance, model.provenance);
    }

    #[test]
    fn absolute_paths_inside_the_root_become_relative_and_others_stay() {
        let mut a = json!({ "path": "/work/repo/specs/001-x/plan.md" });
        relativise(&mut a, Some("/work/repo"));
        assert_eq!(a["path"], "specs/001-x/plan.md");
        let mut outside = json!({ "path": "/work/repository-two/x" });
        relativise(&mut outside, Some("/work/repo"));
        assert_eq!(outside["path"], "/work/repository-two/x");
        let mut none = json!({ "path": "/etc/passwd" });
        relativise(&mut none, None);
        assert_eq!(none["path"], "/etc/passwd");
    }

    /// A stop is its evidence: what speccoder cannot check goes on, the
    /// rest is asked once, a refused call stops at once.
    #[test]
    fn a_stop_stands_on_evidence_speccoder_checks() {
        let gate = StopGate {
            spec: "Rows are sorted\n  ascending by name.".to_owned(),
            frozen: vec!["tests/test_us3.py".to_owned()],
            rejected: false,
        };
        let call = |kind: &str, evidence: &str| json!({ "kind": kind, "evidence": evidence, "reason": "why" });
        let judge =
            |args: &Value, refused: bool, asked: bool| judge_stop(&gate, args, refused, asked, 5);
        let unproven = |s: Stop| matches!(s, Stop::Refused(_));

        // The T018 stop: scope is no kind, an entry point is no evidence.
        assert!(unproven(judge(
            &json!({ "reason": "beyond the task's module scope" }),
            false,
            false
        )));
        assert!(unproven(judge(&call("scope", "src/cli"), false, false)));
        assert!(unproven(judge(
            &call("wrong_test", "tests/new_test.py"),
            false,
            false
        )));
        assert!(unproven(judge(
            &call("spec_conflict", "sorted descending by name"),
            false,
            false
        )));
        assert!(unproven(judge(
            &call("spec_conflict", "sorted"),
            false,
            false
        )));
        assert!(unproven(judge(
            &call("refused", "cargo add x"),
            false,
            false
        )));

        // Checked evidence is asked about once, with the turns left; the
        // second call stops, its reason first.
        let quote = call("spec_conflict", "sorted ascending by name");
        assert!(
            matches!(judge(&quote, false, false), Stop::Asked(t) if t.contains("5 turns are left"))
        );
        assert_eq!(
            judge(&quote, false, true),
            Stop::Stopped("why — the spec says “sorted ascending by name”".to_owned())
        );
        assert_eq!(
            judge(&call("wrong_test", "./tests/test_us3.py"), false, true),
            Stop::Stopped("why — frozen test `./tests/test_us3.py`".to_owned())
        );
        // A refused call needs no second word, nor does the last turn.
        assert!(matches!(
            judge(&call("refused", "cargo add x"), true, false),
            Stop::Stopped(_)
        ));
        let q = call("needs_information", "which locale?");
        assert!(matches!(
            judge_stop(&gate, &q, false, false, 0),
            Stop::Stopped(_)
        ));
    }

    /// The md2csv example (2026-11-04): after each answer the attempt's
    /// whole turn log was printed again. What a replayed step says is not.
    #[test]
    fn a_replayed_step_says_nothing() {
        #[derive(Debug, Default)]
        struct Seen(std::sync::Mutex<Vec<u32>>);
        impl crate::progress::Progress for Seen {
            fn event(&self, e: &crate::progress::Event) {
                if let crate::progress::Event::ToolCall { turn, .. } = e {
                    self.0.lock().unwrap().push(*turn);
                }
            }
        }
        let seen = std::sync::Arc::new(Seen::default());
        let replaying = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(true));
        let quiet = Quiet {
            replaying: std::sync::Arc::clone(&replaying),
            next: seen.clone(),
        };
        let call = |turn| crate::progress::Event::ToolCall {
            task: "T012".to_owned(),
            turn,
            tool: "run_command".to_owned(),
            target: String::new(),
            decision: "allow".to_owned(),
            ok: Some(true),
            tail: Vec::new(),
            contained: false,
        };
        crate::progress::Progress::event(&quiet, &call(1));
        replaying.store(false, std::sync::atomic::Ordering::SeqCst);
        crate::progress::Progress::event(&quiet, &call(2));
        assert_eq!(*seen.0.lock().unwrap(), [2]);
    }
}