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//! Every way driving an agent can fail (ARCH §2, §4.4, §6).
//!
//! One taxonomy for the whole executor — the step loop, the config
//! reads, the adapter, the dispatch gate, the inbox — deliberately
//! narrower than brazen's: wire-level distinctions are brazen's, spoken
//! in band as the `CanonicalError` this enum folds into
//! [`Error::AdapterError`] (§4.4). It lives beside [`super::run`] rather
//! than inside it because it is the module's shared vocabulary, not one
//! function's.
use super::{budget, dispatch, fork_point, inbox};
use crate::prompt::ExecError;
use std::path::PathBuf;
use thiserror::Error as ThisError;
/// Every way [`run`] can fail. The taxonomy is intentionally narrower
/// than brazen's: wire-level distinctions are brazen's, surfaced in-band
/// as the `CanonicalError` this enum folds into [`Error::AdapterError`].
#[derive(Debug, ThisError)]
// `AdapterError` deliberately keeps the suffix; renaming would churn every
// call site for no clarity. The lint only surfaced once the §3.4 narrowing
// made this enum non-exported.
#[allow(clippy::enum_variant_names)]
pub enum Error {
#[error("config: {0}")]
Config(#[from] crate::config::LoadError),
#[error("harness root: {0}")]
HarnessRoot(#[from] crate::harness_root::Error),
#[error("providers.yaml has no {0:?} role")]
RoleMissing(String),
#[error(transparent)]
Layout(#[from] crate::workspace::LayoutError),
/// The start named a fork point that resolves to nothing, or named
/// two (§2.3, [`fork_point`]) — declined before the branch exists.
#[error(transparent)]
ForkPoint(#[from] fork_point::Error),
#[error("read control {path} from the config commit (ARCH §2.2): {source}")]
ControlRead {
path: PathBuf,
#[source]
source: std::io::Error,
},
#[error(
"model id {0:?} collides with the reserved transcript origin token `tool` (ARCH §2.3); \
rename the model row"
)]
ReservedModelId(String),
#[error("i/o writing conversation artifact: {0}")]
Io(#[from] std::io::Error),
#[error("adapter subprocess: {0}")]
AdapterSpawn(#[source] std::io::Error),
/// The adapter binary is not there. `NotFound` at the spawn is the
/// one launch failure the user can act on, and the first real
/// command of every binary-install user hits it — neither `cargo
/// install litany` nor the release tarball lays down `bz`. So it
/// gets the version guard's voice rather than a bare errno: the
/// binary, the fact, the section, and the literal fix-it command
/// carrying the linked pin ([`brazen_pin`], the number's one home).
/// The errno trails as detail.
#[error(
"provider adapter {binary:?} not found (ARCH §4.4 — the default adapter is `bz` on \
PATH; install the pinned binary: cargo install brazen --version ={pin} --locked, \
or name an adapter you have with `adapter:` in the harness root's models.yaml): \
{source}"
)]
AdapterMissing {
binary: String,
pin: String,
#[source]
source: std::io::Error,
},
#[error("tool {tool}: {source}")]
ToolExec {
tool: String,
#[source]
source: ExecError,
},
/// The configured tool control could not adjudicate — it would not
/// spawn, crashed, or broke the verdict protocol (§3.3 *Tool
/// control*). **Fails closed**: the invocation never executes and
/// the step aborts loudly. Closed because a control exists to keep
/// an invocation from running unreviewed — failing open would run
/// exactly what the operator asked to gate; loud rather than
/// in-band because a broken control is operator infrastructure the
/// model can neither see nor fix, and an in-band decline would
/// invite blind retries against it.
#[error(
"tool control {command:?} failed adjudicating {tool:?}: {detail} — a control that \
cannot answer fails closed: the invocation does not run and the step aborts \
(ARCH §3.3 Tool control); fix the control or remove the workflow's tool_control: block"
)]
ToolControl {
command: String,
tool: String,
detail: String,
},
#[error("adapter emitted malformed v=1 event JSON: {0}")]
AdapterJson(#[source] serde_json::Error),
/// A provider failure brazen spoke in band (§4.4), carrying the
/// **provider row** the model call was routed to. The row is litany's own
/// fact — a role's `provider:` in the config commit's
/// `providers.yaml` (§4.3) — and brazen, which owns endpoints and
/// auth, never learns which name litany knows it by, so naming it is
/// this side's job: a workspace binds several rows, and a decline
/// that names none of them says nothing about where to look.
#[error("provider error ({kind}) on provider row {row:?}: {message}")]
AdapterError {
kind: String,
row: String,
message: String,
},
/// The credential-shaped case of the above — brazen's `auth` kind,
/// which it normalizes a 401/403 into. It is split out for the same
/// reason [`Error::AdapterMissing`] is split from `AdapterSpawn`: it
/// is the one provider failure a first-run user is *certain* to hit
/// and can act on unaided, so it gets a remedy rather than a
/// classification. brazen's own message already names the remedies —
/// but as `bz --login --provider <id>`, a literal placeholder,
/// because the row id is exactly what it cannot supply. This variant
/// substitutes it.
#[error(
"provider error (auth) on provider row {row:?}: {message} — no credential is \
reaching that row; authenticate it with `bz --login --provider {row}`, or export \
the API-key env var it is configured to read. `bz --list-providers` shows every \
row's auth mode and credential state, and the row a role uses is its `provider:` \
in the config commit's providers.yaml (ARCH §4.3). Auth and endpoints are \
brazen's alone — the harness never sees credential material (ARCH §4.4)"
)]
AdapterAuth { row: String, message: String },
#[error(
"adapter stream ended without a terminal `end` (killed mid-stream, ARCH §2.9); \
adapter stderr tail: {tail} (full capture: {stderr_log})"
)]
AdapterHalfStream { stderr_log: PathBuf, tail: String },
#[error(
"bz version {found:?} does not match the linked brazen crate {expected:?} \
(ARCH §4.4 — install the pinned binary: cargo install brazen --version ={expected})"
)]
VersionSkew { found: String, expected: String },
#[error("adapter-override handshake failed: MessageStart.v={found:?}, expected {expected}")]
HandshakeMismatch { found: Option<u8>, expected: u8 },
#[error("git {op}: {source}")]
Git {
op: &'static str,
#[source]
source: std::io::Error,
},
/// The §6 budget gate refused a dispatch before it forked
/// ([`child_dispatch::run`]) — the declared ceiling would be breached
/// by the child that does not exist yet. Distinct from the
/// `budget-exhausted` *terminal* state (§6, [`budget::mark_exhausted`]),
/// which retires a branch that already exists: nothing was created
/// here, so there is no branch to mark and no epitaph to deposit.
#[error(
"dispatch of {child} from {parent} refused: {exhausted} (ARCH §6 budgets — \
the limit is declared in the governing config's workflow.yaml)"
)]
DispatchRefused {
child: String,
parent: String,
exhausted: budget::Exhausted,
},
/// A grant the governing config commit does not describe (§3.3),
/// refused at the fork rather than composed into a smaller toolset.
#[error(transparent)]
GrantUndescribed(#[from] dispatch::Undescribed),
/// A `--name` malformed, id-shaped or taken (§2.3) — refused pre-fork.
#[error(transparent)]
NameUnavailable(#[from] crate::workspace::agent_name::Unavailable),
/// The hop's target has no `agents/*` ref — the shared existence
/// decline ([`crate::workspace::require_agent`]), fired *before* the
/// lease so the refusal leaves no inbox directory behind. It is
/// deliberately distinct from the §2.11 lost-lease no-op: that one
/// is a live agent already being driven, this one is no agent at all.
#[error(transparent)]
UnknownAgent(#[from] crate::workspace::UnknownAgent),
#[error("acquire executor lock on inbox {path}: {source}")]
ExecutorLock {
path: PathBuf,
#[source]
source: std::io::Error,
},
#[error(
"adopt LITANY_LOCK_FD lease for {agent}: {detail} — a bad fd means a defective \
launcher; declined, never silently reacquired (ARCH §6)"
)]
LeaseAdopt { agent: String, detail: String },
#[error(
"branch {branch} tip is an assistant entry with tool_use unmatched by committed \
tool results — a mid-step crash after the assistant entry landed; tool side \
effects are not replayable, so this is declined (ARCH §6). Recover by \
fork-from-history (ARCH §2.3)."
)]
UnpairedToolUse { branch: String },
#[error(
"workflow action {action:?} is not yet interpreted at the {event} event (ARCH §6 \
binding interpreter — shipped subset is the terminal ref marks); the action is \
in the closed set but its executor is a tracked follow-on of bl-6a3b"
)]
ActionUnsupported { action: String, event: &'static str },
#[error("deposit initial user message: {0}")]
Deposit(#[from] inbox::DepositError),
/// A selected `summary/**` entry carries git conflict-marker lines
/// (§5.2 marker guard). The write path promises this can never
/// happen — the compaction landing declines any content conflict
/// during the replay (§2.6) — so a marked summary is a violated
/// invariant, and composing it would send corrupted context into
/// every subsequent model call on the branch (§2.7). Refused
/// loudly, naming the path; recovery is §5.4 deletion or repair.
#[error(
"assembly refused {path}: it carries git conflict-marker lines, which the ARCH §2.6 \
compaction-landing decline promises summary/** never does; composing it would \
corrupt the branch's context (ARCH §2.7). Repair or delete the file (ARCH §5.4) \
to resume"
)]
SummaryConflictMarkers { path: String },
/// A compactor nominated the branch's **dispatch entry** — the
/// transcript entry its opening prompt landed as (§2.3, §2.11). The
/// goal is not compaction-eligible (§2.7): the same text rides
/// `goal.md` and is quoted verbatim into the compactor's own goal, so
/// that one entry reads as pure duplication to a model told to
/// nominate superseded files, and deleting it deletes the operator's
/// only copy of the prompt the conversation exists to serve.
#[error(
"{path} is the branch's dispatch entry — its opening prompt, the goal in transcript \
form — and is not compaction-eligible (ARCH §2.7). Nominate a later transcript \
entry, a superseded summary/, or a spent skills/ body instead"
)]
DispatchEntryNotEligible { path: String },
#[error("tool {name} schema unreadable at {path}: {source}")]
ToolSchemaIo {
name: String,
path: PathBuf,
#[source]
source: std::io::Error,
},
#[error("tool {name} schema at {path} is not valid JSON: {source}")]
ToolSchemaJson {
name: String,
path: PathBuf,
#[source]
source: serde_json::Error,
},
#[error("tool {name} skill frontmatter unreadable at {path}: {source}")]
SkillFrontmatterIo {
name: String,
path: PathBuf,
#[source]
source: std::io::Error,
},
#[error("tool {name} skill frontmatter at {path} is malformed: {source}")]
SkillFrontmatter {
name: String,
path: PathBuf,
#[source]
source: serde_yaml_ng::Error,
},
}
impl Error {
/// Fold a settled in-band `CanonicalError` into this taxonomy,
/// naming the **provider row** `bz` was invoked with (§4.3). The
/// choice between the two adapter variants belongs here, beside the
/// wordings it picks between, not at the retry loop that happens to
/// hold the row: brazen's `auth` kind (its normalization of a
/// 401/403) takes the remedy-bearing variant, everything else keeps
/// the classification.
pub(super) fn from_adapter(row: &str, err: brazen::CanonicalError) -> Self {
if err.kind == brazen::ErrorKind::Auth {
return Error::AdapterAuth {
row: row.to_string(),
message: err.message,
};
}
Error::AdapterError {
kind: format!("{:?}", err.kind),
row: row.to_string(),
message: err.message,
}
}
}