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fix(agent_loop): grant one deliver-first turn when a no-progress guard halts - #588
When the repeat/no-progress guard trips, the run ends immediately in the Pause branch of the steering loop. The model is stopped mid-loop with its deliverable possibly unwritten, so the run terminates as Halted having produced nothing — even when it was one step from finishing.
Change
Grant the model exactly one final "deliver-first" turn when the pause was caused by a guard halt (ctx.halted_by_guard is set):
clear the guard latch (take_halted_by_guard / _cause) and resume() steering,
push a nudge instructing it to write its final output now and stop,
continue the loop for one more turn.
It is gated one-shot per run via a new ctx.deliver_first_attempted flag and on remaining_model_calls() > 0, so a model that ignores the nudge and trips the guard a second time ends the run for real — it cannot loop on the nudge. Human- and orchestrator-initiated pauses are untouched; the new path fires only on a guard-caused pause.
Three files, +45 lines, all additive:
agent_loop/run_loop.rs — the nudge constant + the guard-halt branch
context/types.rs, context/mod.rs — the one-shot deliver_first_attempted latch and its init
Validation (what I did and did not verify)
Applies cleanly on current main; every API it calls (take_halted_by_guard, remaining_model_calls, AgentEvent::ControlApplied, steering resume, SteeringOutcome::Pause) is present on main, and the hunks land at near-identical offsets — the surrounding code region is unchanged.
This exact change compiles as part of the OpenHuman build that vendors tinyagents.
I did not run cargo check/the harness test suite against this branch locally (no toolchain in that environment). Leaving the compile and tests to CI. A focused unit test for "guard halt → one deliver-first turn → second halt ends the run" is a reasonable follow-up.
When enabled, a run halted for repeated actions or lack of progress can take one final model turn to provide a response, if model-call capacity remains and no host pause takes precedence at the halt checkpoint. This option is disabled by default. If the final turn makes a tool call or is paused, the run ends with the original guard halt still reported.
…d halts
When the repeat/no-progress guard trips, the run ended immediately in the Pause
steering branch -- the model is stopped mid-loop with its deliverable possibly
unwritten, so the run terminates as Halted having produced nothing.
Grant exactly one final "deliver-first" turn when the pause was a guard halt
(ctx.halted_by_guard set): clear the guard latch, resume steering, push a nudge
telling the model to write its final output now, and loop once more. Gated
one-shot per run via ctx.deliver_first_attempted and on remaining model calls,
so a model that ignores the nudge and trips the guard again ends the run for
real -- it cannot loop on the nudge.
The change is additive and fires only on a guard-caused pause; human and
orchestrator pauses are unaffected.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
medium: Update the PR body to cover the steering counter changes and tests ((pull request description)) Problem: The body says "Three files, +45 lines, all additive" and lists only `agent_loop/run_loop.rs`, `context/types.rs` and `context/mod.rs`. The branch actually touches nine files and ch Suggested fix:
## Problem
When the repeat/no-progress guard trips, the run ends immediately in the `Pause` branch of the steering loop. The model is stopped mid-loop with its deliverable possibly unwritten, so the run terminates as `Halted` having produced nothing — even when it was one step from finishing.
## Change
Opt in via the new `RunPolicy::deliver_first_on_guard_halt` (off by default): a guard-caused pause first grants the model exactly one "deliver-first" turn.
- `agent_loop/run_loop.rs` — the nudge constant and the guard-halt branch: move the guard latch (`take_halted_by_guard` / `_cause`) into a new `ctx.deferred_halt`, `resume()` steering, push the nudge, and `continue` for one more turn. A first checkpoint after that turn restores the halt and returns `Paused` whatever the turn asked for, so the run still ends `Halted` with the guard's cause; the same restore runs after the loop, so a pause that ends the deliver-first turn still reports the guard halt.
- `context/types.rs`, `context/mod.rs` — the one-shot `deliver_first_attempted` latch, `deferred_halt`, and `DeferredHalt { summary, cause, pause }`.
- `steering/mod.rs`, `steering/types.rs` — `pause_requests` / `guard_pauses` counters on the handle, `note_guard_pause()`, `latch_pause` counting applied pauses (now `pub(crate)`), and `resume()` clearing both counters so a host pause after a resume is never counted as a guard's. The deliver-first turn is granted only when every pause applied at that checkpoint is a guard's (`pause_requests() == guard_pauses()`), so a host pause at the same checkpoint still ends the run. Also gated on `remaining_model_calls() > 0` and one-shot per run, so a model that ignores the nudge and trips the guard again ends the run for real.
- `middleware/library/repeat_progress.rs`, `middleware/library/failure_scope.rs` — call `note_guard_pause()` before sending `Pause`.
Human- and orchestrator-initiated pauses are untouched.
## Tests
- `repeat_escalation_loop_tests.rs`: opting in grants exactly one turn and the run finishes when the model delivers; a tool call in that turn is its last (no model call after it) and the run ends `Halted`; a host pause at the halting checkpoint is not lifted; two guards halting together still grant the turn; a host pause during the deliver-first turn keeps its reason and the run still reports `Halted` with the guard's cause.
- `steering/mod_tests.rs`: a resume clears guard-pause ownership before a later host pause.
## Validation
I did not run `cargo check` or the harness test suite locally (no toolchain in that environment); leaving compile and tests to CI.
Verdict: Ready for maintainer review · Priority: medium Coverage: Reviewed 10 of 10 files.
Diagnostics and supporting details
Full summary
Pull request purpose (title): fix(agent_loop): grant one deliver-first turn when a no-progress guard halts. Tiny Sweeper completed its review; deterministic results follow.
Review snapshot
Change surface
Files
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8
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0
Tests
2
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1
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Completeness: Complete Test assessment: Test coverage is assessed from changed tests and lane evidence; execution is not claimed without trusted check data.
Features
Added — Opt-in deliver-first turn on guard halt: With `RunPolicy::deliver_first_on_guard_halt` enabled, a repeat/no-progress guard halt first gives the model one nudge turn to write its deliverable instead of ending the run at once; disabled by default, and not granted when a host pause shares the checkpoint or no model call remains. (crates/tinyagents-harness/src/agent_loop/run_loop.rsimpl<State: Send + Sync, Ctx: Send + Sync> AgentHarness<State, Ctx> {, crates/tinyagents-harness/src/runtime/types.rspub struct RunPolicy {, crates/tinyagents-harness/src/runtime/types.rsimpl Default for RunPolicy {)
Added — Deferred halt restored after the nudge turn: The guard halt is stashed in `ctx.deferred_halt` and reinstated at the next steering checkpoint or when the run ends paused, so the run still terminates paused/halted with the guard's reported cause after the single deliver-first turn. (crates/tinyagents-harness/src/context/types.rspub struct RunContext<Ctx = ()> {, crates/tinyagents-harness/src/context/types.rsuse crate::ids::{CallId, RunId, ThreadId};, crates/tinyagents-harness/src/agent_loop/run_loop.rsimpl<State: Send + Sync, Ctx: Send + Sync> AgentHarness<State, Ctx> {)
Modified — Guard-vs-host pause accounting on the steering handle: `pause_requests` and `guard_pauses` counters live on `SteeringLocal`, `latch_pause` increments `pause_requests`, `resume` clears both, both library guards call `note_guard_pause`, and the loop compares the counters so guard pauses alone are lifted while a host pause at the same checkpoint still ends the run. (crates/tinyagents-harness/src/steering/mod.rsimpl SteeringHandle {, crates/tinyagents-harness/src/steering/types.rspub(crate) struct SteeringLocal {, crates/tinyagents-harness/src/middleware/library/repeat_progress.rsimpl RepeatProgressMiddleware {, crates/tinyagents-harness/src/middleware/library/failure_scope.rsimpl<Ctx: Send + Sync> FailureScopeMiddleware<Ctx> {, crates/tinyagents-harness/src/context/mod.rsimpl<Ctx> RunContext<Ctx> {)
Tests
added — An opted-in guard halt grants exactly one nudge; the model delivers and the run finishes with no pause and the answer last.: Asserts on observable run state (nudge count, last message, paused). No trusted evidence confirms it executed or passed. (crates/tinyagents-harness/src/middleware/library/repeat_escalation_loop_tests.rsasync fn a_guard_halt_is_reported_as_a_halted_terminal_outcome() {)
added — The deliver-first turn is the last one even when it calls a tool: tool run count, absence of a later model call, paused state, and `TerminalReason::Halted` are asserted.: Asserts observable run state tied to the deferred-halt restore. No trusted evidence confirms it executed or passed. (crates/tinyagents-harness/src/middleware/library/repeat_escalation_loop_tests.rsasync fn a_guard_halt_is_reported_as_a_halted_terminal_outcome() {, crates/tinyagents-harness/src/agent_loop/run_loop.rsimpl<State: Send + Sync, Ctx: Send + Sync> AgentHarness<State, Ctx> {)
added — A host pause at the halting checkpoint is not lifted: no nudge is sent, the tool run count is as before, and the run stays paused.: Covers the pause-ownership comparison. No trusted evidence confirms it executed or passed. (crates/tinyagents-harness/src/middleware/library/repeat_escalation_loop_tests.rsasync fn a_guard_halt_is_reported_as_a_halted_terminal_outcome() {, crates/tinyagents-harness/src/steering/types.rspub(crate) struct SteeringLocal {)
added — Two guards halting at the same call still grant the deliver-first turn because multiple guard pauses are not treated as a host pause.: Asserts nudge count and final message. No trusted evidence confirms it executed or passed. (crates/tinyagents-harness/src/middleware/library/repeat_escalation_loop_tests.rsasync fn a_guard_halt_is_reported_as_a_halted_terminal_outcome() {, crates/tinyagents-harness/src/middleware/library/failure_scope.rsimpl<Ctx: Send + Sync> FailureScopeMiddleware<Ctx> {)
added — A host pause arriving inside the deliver-first turn is kept as the pause reason while the terminal reason stays `Halted` and the guard's failure cause is reported.: Asserts pause reason, `TerminalReason::Halted`, and presence of a failure cause. The tests lane separately reports that two branches added by the diff remain untested, including the `remaining_model_calls()` gate. No trusted evidence confirms execution. (crates/tinyagents-harness/src/middleware/library/repeat_escalation_loop_tests.rsasync fn a_guard_halt_is_reported_as_a_halted_terminal_outcome() {, crates/tinyagents-harness/src/agent_loop/run_loop.rsimpl<State: Send + Sync, Ctx: Send + Sync> AgentHarness<State, Ctx> {)
Before merge
None.
Agent review details
critique
Conclusion: Success
Scope reviewed: all assigned evidence
Positive: The critique lane answered 2 findings across the 10 reviewed files; its summary does not enumerate them, and lane status is authoritative only for the fact that it answered.
Lane summary: Reviewed 9 files; 2 findings. _The code index is behind this pull request (indexed at `882e0b63480e`), so retrieved context may be out of date._
security
Conclusion: Success
Scope reviewed: all assigned evidence
Positive: The security lane answered with 0 findings across the 10 reviewed files.
Lane summary: Reviewed 9 files; 0 findings. _The code index is behind this pull request (indexed at `882e0b63480e`), so retrieved context may be out of date._
tests
Conclusion: Success
Scope reviewed: all assigned evidence
Lane summary: The change adds an opt-in deliver-first turn after a repeat/no-progress guard halt, plus new steering counters that separate a guard's pause from a host pause at the same checkpoint. The central paths (grant, tool-calling final turn, host pause at the halt, two guards, host pause inside the final turn, counter reset on resume) are pinned by new tests in `repeat_escalation_loop_tests.rs` and `steering/mod_tests.rs`, but two branches added by the diff have no test at all, including the `remaining_model_calls()` condition the public doc comment in this same PR promises. _The code index is behind this pull request (indexed at `882e0b63480e`), so retrieved context may be out of date._
commits
Conclusion: Success
Scope reviewed: all assigned evidence
Positive: The commits lane answered: no sensitive content in committed files.
Lane summary: No sensitive content in committed files. _The code index is behind this pull request (indexed at `882e0b63480e`), so retrieved context may be out of date._
description
Conclusion: Success
Scope reviewed: all assigned evidence
Positive: The description lane answered that the code change is coherent and covered by new tests, but the PR body is stale: it describes a three-file, +45-line, purely additive change with no tests, while the branch rewrites steering pause accounting, adds `DeferredHalt` and its restore paths, touches both guard middlewares, and ships six new tests; the body needs rewriting to match.
Lane summary: The code change itself is coherent and covered by new tests, but the pull request body is stale: it describes a three-file, +45-line, purely additive change with no tests, while the branch also rewrites steering-handle pause accounting (`pause_requests`/`guard_pauses`, `latch_pause` counting, `resume()` clearing them), adds `DeferredHalt` and its restore paths, touches both guard middlewares, and ships six new tests. The body needs rewriting to match. _The code index is behind this pull request (indexed at `882e0b63480e`), so retrieved context may be out of date._
Resolve them on the pull request, or post @coderabbitai approve as a new top-level comment to resolve them and request approval.
Commit: 82ff67defba9.
Walkthrough
An opt-in run policy grants one final model turn after an eligible repeat/no-progress guard halt. The run loop defers and restores the halt. Pause tracking distinguishes guard pauses from host pauses. Tests cover final answers, tool calls, and pause outcomes.
Changes: Guard halt final turn
Layer / File(s)
Summary
Policy and pause state crates/tinyagents-harness/src/runtime/types.rs, crates/tinyagents-harness/src/context/*, crates/tinyagents-harness/src/steering/*, crates/tinyagents-harness/src/middleware/library/failure_scope.rs, crates/tinyagents-harness/src/middleware/library/repeat_progress.rs
RunPolicy adds an opt-in final-turn setting that defaults to disabled. RunContext stores attempt and deferred-halt state. Steering counts pause requests until resume, and guard middleware records guard pauses.
The loop grants the turn only when the policy is enabled, pause requests are exclusively guard pauses, no prior attempt occurred, a guard halt exists, and model-call capacity remains. It saves the halt, resumes steering, adds the nudge, emits a control event, and continues. The loop restores the halt after the turn, except when cancellation takes precedence.
Tests cover completion after a final answer, a tool call that ends the run without another model call, simultaneous guard halts, host pauses at the halt checkpoint or during the final turn, and clearing guard-pause ownership on resume.
sequenceDiagram
participant RunLoop
participant SteeringHandle
participant Model
participant ControlEvent
RunLoop->>SteeringHandle: Applies pending steering and checks pause requests
SteeringHandle-->>RunLoop: Provides pause state and request counts
RunLoop->>RunLoop: Checks final-turn eligibility
RunLoop->>ControlEvent: Emits deliver_first_nudge
RunLoop->>Model: Continues with the final-turn nudge
Model-->>RunLoop: Returns a turn result
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Possibly related PRs
tinyhumansai/tinyagents#583: Both PRs affect preservation of the classified halt cause when a guard-terminated run ends.
Suggested reviewers:senamakel
Merge Risk: Moderate · up to 82ff6
The new final-turn behavior is opt-in, but two edge cases remain. A host pause can be lifted in unusual queue orderings. A guard halt can be lost when a tool approval is deferred during the final turn. Resolve these before relying on the option.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Docstring Coverage
Docstring coverage is 44.44% 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
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Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title clearly and concisely describes the primary change: granting one deliver-first turn when a no-progress guard halts the agent loop.
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Check skipped because no linked issues were found for this pull request.
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Full details: Docstring Coverage
Explanation
Docstring coverage is 44.44% 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 9 functions across 10 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
A guard pause marks the end of the run, One final turn may yet be done. The nudge is added; the model replies, The saved halt waits as the turn goes by. If hosts pause, their reason stays, The rabbit hops through guarded ways.
312-313: Major · Data Integrity & Integration · Heavy lift
⚠️Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.
Preserve the guard cause through the final turn.
If the model responds that it cannot complete the task, the loop now reports a normal completion with no failure_cause. The caller loses the classified guard reason that previously distinguished this halt from a successful answer. Retain the guard cause and expose it when the final turn does not resolve the halt. (raw.githubusercontent.com)
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/tinyagents-harness/src/agent_loop/run_loop.rs:
- Line 330: Update the final-turn handling in the run loop so the last permitted
model call can settle its response and any permitted tool calls without starting
another normal model turn. Ensure a continue_turn response cannot bypass the
limit or lead to a subsequent model-call-limit failure.
- Line 315: Update the pause handling around handle.resume() to distinguish the
guard’s pause from independent pauses accepted by apply_pending_steering. Resume
only when no independent pause was requested, preserving that request in the
shared latch.
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Thanks for this. The idea is reasonable, but the change currently breaks an existing contract: a_later_registered_after_tool_sees_the_marker_on_refused_calls (repeat_escalation_loop_tests.rs:161) fails on every CI lane and on our own build of this branch merged with main. The extra turn re-issues the guarded call, so the guard refuses it a second time ("halted" appears twice). Main passes that test.
Could you (1) make the deliver-first turn avoid re-tripping the guard, or update that test and explain the new contract; (2) add a test for "guard halt → one deliver-first turn → a second halt ends the run"; and (3) reply to CodeRabbit's two Major threads (a same-checkpoint human pause is discarded by resume(); the final turn can still make further calls)?
Also worth weighing: OpenHuman already gives halted runs a closing summary after the loop, without tools, so a maintainer should decide whether an in-loop final turn is wanted as well.
- RunPolicy::deliver_first_on_guard_halt turns the deliver-first turn
on; it is off by default, so a guard halt still ends the run at once
and existing hosts and tests see no change.
- The turn is granted only when the guard's pause is the only one at
that checkpoint, so a host or orchestrator pause sent alongside it is
no longer cleared by resume().
- The halt is kept rather than discarded and restored at the next
checkpoint, so the run ends halted after that one turn even if the
turn made new tool calls; a text-only answer still finishes the run.
- The new field's doc comment no longer takes over halted_by_guard's.
- Tests: one deliver-first turn, nothing after it, and a host pause at
the halting checkpoint is not lifted.
Thanks for this. We pushed two commits on top of your branch (nothing rewritten): a clean merge of main, and b0d548a, which makes CI green and answers both review threads:
The deliver-first turn is opt-in, through RunPolicy::deliver_first_on_guard_halt (off by default). A guard halt keeps ending the run at once unless a host turns it on, so the existing a_later_registered_after_tool_sees_the_marker_on_refused_calls contract holds unchanged. Some hosts already write their own closing summary after a halted run, so we didn't want to add a billable turn for them by default.
It's granted only when the guard's pause is the only one at that checkpoint, so a host pause is kept.
The halt is restored after the one turn, so the run ends halted even if the model starts new tool calls.
The new field's doc comment had taken over halted_by_guard's; that's fixed.
Three tests: one deliver-first turn and then the answer, nothing after that turn, and a host pause not lifted.
Let us know if you'd rather it be on by default.
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Actionable comments posted: 2
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/tinyagents-harness/src/agent_loop/run_loop.rs:
- Line 358: Update the Pause branch in settle_natural_finish to restore the
removed guard summary and typed cause before returning, so terminal mapping
reports Halted while preserving the host’s latched pause. Leave
ctx.deferred_halt unconsumed on this path and keep the successful-answer path
unchanged.
- Line 392: Update the pause handling around pause_requests() to distinguish
pauses issued by repeat guards from pauses requested by the host. Track pause
ownership so multiple guard pauses for the same result do not suppress the
opt-in final turn; suppress it only when a host pause is present.
---
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… pause
- The deliver-first turn compared the checkpoint's pause count with 1,
so two guards halting on the same result looked like a host pause and
blocked it. The guards now count the pauses they send on the run
context, and the turn is granted when every applied pause is a guard's.
- A host pause that ends the deliver-first turn, through the natural
finish's steering checkpoint, returned without the deferred halt, so
the run reported Paused without its guard cause. Any paused exit now
restores the deferred halt first; the host's pause state is kept.
- Tests for both.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/tinyagents-harness/src/agent_loop/run_loop.rs:
- Line 400: Update pause ownership accounting where commands are applied so an
explicit host Resume clears any earlier guard-pause ownership, while a
subsequent host PauseWith remains attributed to the host. Keep pause_requests
and ctx.guard_pauses synchronized with command order so the deliver-first check
cannot mistake a host pause for a guard pause.
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The run context counted the pauses guards sent, but a resume cleared
only the handle's pause count. A guard pause, a host Resume and a host
PauseWith at one checkpoint then left both counts at one, and the
deliver-first turn could lift the host's pause.
The guards now record their pauses on the steering handle (which
their clones share with the run's), and a resume clears that record
together with the pause count, so a host pause applied after a resume
is never taken for a guard's. A guard pause queued behind a resume is
then not counted either, which can only withhold the extra turn.
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⚠️ Outside diff range comments (1)
Major · Preserve the guard halt across deferred tool approval. · run_loop.rs:143-144
crates/tinyagents-harness/src/agent_loop/run_loop.rs:143-144 Major · Stability & Availability · Heavy lift
Preserve the guard halt across deferred tool approval.
If a deliver-first tool call requires approval and exits as LoopExit::Deferred, the original guard halt stays in the consumed RunContext. On resume_deferred, a new context has no halt to restore, so the loop can request another model turn and finish without reporting the halt.
Persist the halt with the deferred request. After resolving the request, restore the halt without requesting another model turn. Preserve normal resume behavior for requests without a deferred halt.
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Review comment at @crates/tinyagents-harness/src/agent_loop/run_loop.rs around lines 143 - 144:
Preserve the guard halt when the loop exits as LoopExit::Deferred: store it with the deferred request, then restore it in resume_deferred after resolving the request and exit without requesting another model turn. Keep the existing resume behavior for deferred requests that have no halt.
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/tinyagents-harness/src/steering/mod.rs:
- Line 421: Update queued-command handling in the steering loop to retain
ownership with each pause command and adjust guard and host pause counts when
each command is applied. Preserve the deliver-first turn for an eligible run
when a queued Resume precedes a guard pause, and ensure retracting a guard pause
cannot cause the loop to clear a host pause or execute another model turn.
---
Outside diff comments:
Review comments at @crates/tinyagents-harness/src/agent_loop/run_loop.rs:
- Around line 143-144: Preserve the guard halt when the loop exits as
LoopExit::Deferred: store it with the deferred request, then restore it in
resume_deferred after resolving the request and exit without requesting another
model turn. Keep the existing resume behavior for deferred requests that have no
halt.
---
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cat -n crates/tinyagents-harness/src/agent_loop/run_loop.rs | sed -n '1120,1245p'
cat -n crates/tinyagents-harness/src/agent_loop/run_loop.rs | sed -n '1310,1385p'
cat -n crates/tinyagents-harness/src/agent_loop/run_loop.rs | sed -n '115,160p'
Repository: tinyhumansai/tinyagents
Length of output: 13297
Record guard ownership when the queued pause is applied.
If a queued Resume precedes a guard pause, it clears the guard count before the pause is applied. An eligible run then halts without its deliver-first turn.
If a caller retracts the guard pause and a host pause remains, the counts can match. The loop can then clear the host pause and execute another model turn, including tool calls.
Store ownership with each queued command and update the counts when commands are applied.
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Review comment at @crates/tinyagents-harness/src/steering/mod.rs at line 421:
Update queued-command handling in the steering loop to retain ownership with each pause command and adjust guard and host pause counts when each command is applied. Preserve the deliver-first turn for an eligible run when a queued Resume precedes a guard pause, and ensure retracting a guard pause cannot cause the loop to clear a host pause or execute another model turn.
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priority: p2Soon. Real but survivable — a rough edge, a gap, a thing that will bite later.
3 participants
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Problem
When the repeat/no-progress guard trips, the run ends immediately in the
Pausebranch of the steering loop. The model is stopped mid-loop with its deliverable possibly unwritten, so the run terminates asHaltedhaving produced nothing — even when it was one step from finishing.Change
Grant the model exactly one final "deliver-first" turn when the pause was caused by a guard halt (
ctx.halted_by_guardis set):take_halted_by_guard/_cause) andresume()steering,continuethe loop for one more turn.It is gated one-shot per run via a new
ctx.deliver_first_attemptedflag and onremaining_model_calls() > 0, so a model that ignores the nudge and trips the guard a second time ends the run for real — it cannot loop on the nudge. Human- and orchestrator-initiated pauses are untouched; the new path fires only on a guard-caused pause.Three files, +45 lines, all additive:
agent_loop/run_loop.rs— the nudge constant + the guard-halt branchcontext/types.rs,context/mod.rs— the one-shotdeliver_first_attemptedlatch and its initValidation (what I did and did not verify)
main; every API it calls (take_halted_by_guard,remaining_model_calls,AgentEvent::ControlApplied, steeringresume,SteeringOutcome::Pause) is present onmain, and the hunks land at near-identical offsets — the surrounding code region is unchanged.cargo check/the harness test suite against this branch locally (no toolchain in that environment). Leaving the compile and tests to CI. A focused unit test for "guard halt → one deliver-first turn → second halt ends the run" is a reasonable follow-up.🤖 Generated with Claude Code
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