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//! Budget enforcement at the model-call boundary (ARCH §6, v0.7): a
//! conversation that exhausts `max_total_tokens` is stopped before the
//! next adapter invocation and gets the
//! `refs/lernie/budget-exhausted/<branch>` marker; an unbounded workflow
//! never triggers a stop.
use super::fixtures::*;
use crate::prompt::run;
use brazen::FinishReason;
use serde_json::json;
/// `budgets: {max_total_tokens: 8}` — exactly one `stream_of` step's
/// `Usage{input:5, output:3}` = 8 tokens, so the step-2 boundary check
/// trips at `8 >= 8`.
const WORKFLOW_WITH_TOKEN_BUDGET: &str = "events: {}\nbudgets:\n max_total_tokens: 8\n";
fn tool_use_stream() -> Vec<u8> {
// Finishes `tool_use` so the loop advances toward a second step.
stream_of(
FinishReason::ToolUse,
&[Block::ToolUse {
id: "toolu_01",
name: "bash",
input: json!({ "cmd": "ls" }),
}],
)
}
#[test]
fn exhausted_conversation_stops_before_next_model_call_and_marks_the_ref() {
let repo = scaffold_repo_with_workflow(
VALID_PER_REPO_PROVIDERS_YAML,
WORKFLOW_WITH_TOKEN_BUDGET,
Some("body"),
);
let harness = scaffold_harness_root();
// Only two adapter replies are scripted (version guard + step 1). Had
// the budget check failed to stop the loop, step 2 would invoke the
// adapter a third time and the stub would panic — so "no third call"
// is enforced structurally as well as asserted below.
let adapter = StubAdapter::scripted([
StubAdapter::reply_ok(&version_line()),
StubAdapter::reply_ok(&tool_use_stream()),
]);
let git = StubGit::ok();
let (clock, id) = (FixedClock::default(), FixedIdGen);
let (sleeper, tool_executor) = (StubSleeper::default(), StubToolExecutor::ok());
let branch = run(
repo.path(),
"go",
None,
None,
None,
crate::prompt::PinnedDocs::none(),
&valid_deps(
&adapter,
&sleeper,
&git,
&clock,
&id,
&tool_executor,
harness.path(),
),
)
.unwrap();
assert_eq!(branch, "ct-1-deadbeef");
// Step 1 landed 8 tokens; the step-2 boundary check tripped (8 >= 8),
// so the adapter was invoked exactly twice: version guard + step 1.
assert_eq!(adapter.observed.borrow().len(), 2);
assert!(repo.path().join("steps/ct-1-deadbeef/001").exists());
// Step 2 was abandoned before its model call — no step-2 record.
assert!(!repo.path().join("steps/ct-1-deadbeef/002").exists());
// The git-native marker was written at the branch tip (§6).
let runs = git.runs.borrow();
assert!(
runs.iter().any(|(_, args)| args
== &vec![
"update-ref".to_string(),
"refs/lernie/budget-exhausted/ct-1-deadbeef".to_string(),
"HEAD".to_string(),
]),
"expected budget-exhausted update-ref; got {runs:?}"
);
// Terminal-by-exhaustion: no compaction dispatch, no rebase/merge.
assert!(
!runs.iter().any(|(_, args)| {
let head = args.first().map(String::as_str);
head == Some("rebase") || head == Some("merge")
}),
"exhausted conversation must not merge back; got {runs:?}"
);
}
#[test]
fn unbounded_workflow_never_triggers_a_budget_stop() {
// No `budgets:` block → every limit unbounded → the loop runs to a
// normal terminal completion with no budget stop (baseline).
let repo = scaffold_repo(VALID_PER_REPO_PROVIDERS_YAML, Some("body"));
let harness = scaffold_harness_root();
let adapter = StubAdapter::happy(&happy_response_bytes());
let git = StubGit::ok();
let (clock, id) = (FixedClock::default(), FixedIdGen);
let (sleeper, tool_executor) = (StubSleeper::default(), StubToolExecutor::ok());
run(
repo.path(),
"go",
None,
None,
None,
crate::prompt::PinnedDocs::none(),
&valid_deps(
&adapter,
&sleeper,
&git,
&clock,
&id,
&tool_executor,
harness.path(),
),
)
.unwrap();
// Ran to a normal terminal completion — no budget stop, no ref.
let runs = git.runs.borrow();
assert!(
!runs.iter().any(|(_, args)| {
args.iter()
.any(|a| a.starts_with("refs/lernie/budget-exhausted/"))
}),
"no budget-exhausted ref expected under an unbounded workflow"
);
}
#[test]
fn budget_ref_write_failure_surfaces_as_a_git_error() {
// Indices below are relative to the first post-control op; the
// start's preamble precedes them with eight: the fork-point
// lineage query (§2.3), the `config/*` head enumeration and its
// merge-base (the governing-config ancestry derivation, §2.2), and
// five `show` reads (`version` first, the §10 schema-version guard;
// manifest.yaml last before the soul, §5.2).
// The marker `update-ref` is git op #20 in the exhaustion path (0
// worktree add, 1 control rm, 2-6 the descriptor derivation (§3.3 —
// four `cat-file -e` existence reads against the governing config
// commit and one `checkout`), 7 dispatch add, 8 dispatch commit, 9
// step-1 drain stray-probe, 10/11 user-message delivery add+commit,
// 12 step-1 rev-parse, 13/14 step-1 model-output transcript
// add+commit, 15 the tool window's hold-mark probe (§3.3 *Tool
// control*), 16/17 the tool transcript add+commit, 18 step-2 drain
// stray-probe, 19 step-2 rev-parse, 20 mark_exhausted update-ref).
// Failing it surfaces the §6 exhaustion write's error arm.
let repo = scaffold_repo_with_workflow(
VALID_PER_REPO_PROVIDERS_YAML,
WORKFLOW_WITH_TOKEN_BUDGET,
Some("body"),
);
let harness = scaffold_harness_root();
let adapter = StubAdapter::scripted([
StubAdapter::reply_ok(&version_line()),
StubAdapter::reply_ok(&tool_use_stream()),
]);
let git = StubGit::failing_at(29);
let (clock, id) = (FixedClock::default(), FixedIdGen);
let (sleeper, tool_executor) = (StubSleeper::default(), StubToolExecutor::ok());
let err = run(
repo.path(),
"go",
None,
None,
None,
crate::prompt::PinnedDocs::none(),
&valid_deps(
&adapter,
&sleeper,
&git,
&clock,
&id,
&tool_executor,
harness.path(),
),
)
.unwrap_err();
assert!(
matches!(
err,
crate::prompt::Error::Git {
op: "budget-exhausted update-ref",
..
}
),
"got {err:?}"
);
}