[lhk0504]

What changed

Both guardrail stops now mark the run INCOMPLETE when the headless completion gate is on:

• consecutive empty-turn stop (internal/agent/loop.go:588)
• repeated-tool-failure stop (internal/agent/loop.go:809)

Each sets Result.Incomplete = true and a non-empty IncompleteReason. Thresholds (3 empty turns; hint at 2, stop at 6 identical failures), stop answers, message sequence, and retry behavior are unchanged. Interactive runs and --no-completion-gate never take the branch, so their behavior is unchanged.

zero exec already maps Incomplete to exit 4 plus the terminal error/run_end events; these two paths simply never set the flag.

Why

zero exec reported success (exit 0, run_end.status = "success") after both guards halted work, so cron/automation could record an abandoned run as complete. Reproduced on 2e10a4b6 before the change:

empty_turns:            turns=3 incomplete=false reason=""
repeated_tool_failures: turns=6 incomplete=false reason=""
CLI: exit=0 ... {"exitCode":0,"status":"success","type":"run_end"}

After the change, both agent cases are incomplete and the CLI test asserts exit 4, error{code:"incomplete"}, and run_end{status:"incomplete",exitCode:4}.

Tests

• TestHeadlessGuardStopsAreIncomplete: both guard paths under the gate; asserts trigger turns (3/6), Incomplete, and a reason mentioning the stop cause.
• Existing TestRunStopsAfterConsecutiveEmptyTurns / TestRunStopsAfterRepeatedToolFailures now also pin Incomplete == false with the gate off.
• TestRunExecGuardrailStopIncompleteContract: stream-json CLI coverage for gate on (exit 4 + incomplete terminal events) and --no-completion-gate (exit 0 + success). Uses isolateCLIUserState(t) so the models.dev refresh cannot race the TempDir cleanup (the fix(sessions): preserve image attachment summaries on resume #1152/test(cli): isolate the exec image tests from the models.dev refresh #1161 flake).

Verification

• go test ./internal/agent -race -count=1 with the four pre-existing environment failures below skipped: pass
• go test ./internal/cli -race -count=1: the new test passes; only the same pre-existing environment failures below
• make fmt-check vet: pass
• go run ./cmd/zero-release build / smoke: pass
• git diff HEAD --check: pass

Seven tests fail identically on a clean upstream/main worktree in this environment (Linux, root, degraded sandbox helper), so they are unrelated to this change:

• internal/agent: TestRequestPermissionsTurnGrantAllowsLaterToolAndCleansUp, TestRunPromptsAndAllowsOutsideWorkspaceWrite, TestRunSessionAllowsLaterOutsideWorkspaceWrite, TestRunAppliesSandboxEvenInUnsafeMode
• internal/cli: TestRunAddDirDispatchForwardsGrantIntoExecScope, TestExecScopeReRegistrationSwapsCoreToolsByName, TestRunSandboxCheckJSONDeniesOutOfWorkspaceWrite

Fixes #1154

Summary by CodeRabbit

• Bug Fixes
  • Headless runs configured to require a completion signal are now marked incomplete when they stop after repeated empty turns or repeated failures of the same tool.
  • The incomplete result includes a reason identifying the stopping condition and its turn or failure count.
  • Interactive runs and runs without the completion requirement retain their existing behavior.

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• Source mode: Auto
• Repository: Twigpine/zero
• Branch: main
• File: .coderabbit.yaml
• Commit: 2e10a4b
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Commits

Reviewing files that changed from the base of the PR and between 3d60785 and e73ca30.

Files selected for processing: 2

• internal/agent/guardrails_test.go
• internal/agent/loop.go

Files skipped from review as they are similar to previous changes: 2

• internal/agent/guardrails_test.go
• internal/agent/loop.go

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Walkthrough

When the completion signal is required, empty-turn and repeated-tool-failure guard stops now mark the result incomplete and record a reason. Agent and CLI tests cover the guard paths and verify behavior when the completion gate is disabled.

Changes

Headless guard-stop status

Layer / File(s)	Summary
Mark guarded runs incomplete internal/agent/loop.go, internal/agent/guardrails_test.go	Both guard paths now set Incomplete and record a reason when RequireCompletionSignal is enabled. Agent tests cover headless stops, including empty turns after successful tool work, and confirm interactive runs remain complete.
Verify headless CLI status internal/cli/exec_guard_stop_incomplete_test.go	Tests check the exit code, terminal status, error event, and final text with the completion gate enabled. With the gate disabled, tests expect success and no error event.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Possibly related PRs

• Twigpine/zero#1112: It changes daemon handling of exit code 4, which this pull request’s headless guard stops can produce.

Suggested reviewers: kevincodex1

Merge Risk: Minimal · up to e73ca

The change correctly reports guarded headless stops as incomplete while preserving completion-gate opt-out behavior. No actionable merge-blocking issue was found.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely identifies the main change: marking headless agent guardrail stops as incomplete. It matches the implementation and stated objectives.
Linked Issues check		Issue #1154 requires both guard stops to mark headless runs incomplete and preserve the existing CLI contract. In internal/agent/loop.go, the consecutive-empty-turn and repeated-tool-failure branche…
Out of Scope Changes check		The production changes are limited to the two guard-stop branches required by issue #1154. The agent tests verify headless and gate-off behavior. The CLI test verifies the required terminal contract a…

Full details: Linked Issues check

Explanation

Issue #1154 requires both guard stops to mark headless runs incomplete and preserve the existing CLI contract. In internal/agent/loop.go, the consecutive-empty-turn and repeated-tool-failure branches set Result.Incomplete and non-empty IncompleteReason when RequireCompletionSignal is enabled. The gate-off path remains unchanged. Tests cover both guards, expected stop turns, reasons, and gate-off behavior. internal/cli/exec_guard_stop_incomplete_test.go verifies exit code 4, error code incomplete, and terminal run_end status incomplete; it also verifies success with --no-completion-gate. The existing thresholds and stop answers remain unchanged.

Full details: Out of Scope Changes check

Explanation

The production changes are limited to the two guard-stop branches required by issue #1154. The agent tests verify headless and gate-off behavior. The CLI test verifies the required terminal contract and uses isolated user state to prevent an existing test flake. The added test tool supports a required progress-then-empty-turn case. No unrelated production behavior or ignored-file changes appear in the whole-PR diff.

Full details: Docstring Coverage

Explanation

Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 5 functions across 3 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches

Generate unit tests (beta)

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Actionable comments posted: 1

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• Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix review comments

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Inline comments:
Review comments at @internal/agent/loop.go:
- Line 596: Update the headless no-output stop reason to use the consecutive
empty-turn count from `guards.emptyTurns` and describe it as consecutive; keep
the interactive `noOutputStopAnswer(result.Turns)` call unchanged.

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• Source mode: Auto
• Repository: Twigpine/zero
• Branch: main
• File: .coderabbit.yaml
• Commit: 2e10a4b
• Layers: Repository YAML
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• Plan: Advanced
• Run ID: f32998db-e79a-4009-b033-7a9745a859f6

Commits

Reviewing files that changed from the base of the PR and between 2e10a4b and 3d60785.

Files selected for processing: 3

• internal/agent/guardrails_test.go
• internal/agent/loop.go
• internal/cli/exec_guard_stop_incomplete_test.go

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.