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agent_loop: dead-call recovery: a reasoning watchdog, reasoning switched off after a death and back for repeats and the finish check, and the dead call's reasoning carried into the retry - #342
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…g switched off A hosted reasoning model can spend its whole output cap on the hidden reasoning channel and return finish_reason=length with no text and no tool call. Measured on deepseek-v4.1-flash through OpenRouter's routable providers, neither a smaller cap nor a lower effort label stops it: one task died nine times in a row at caps from 65k down to 2k, and at medium effort 11 of 25 calls still died. The one control that gave zero reasoning tokens was effort=none. So the retry or nudged call after a dead one goes out with reasoning switched off, at the same cap (the cap was for the deliberation). The hold-off backs off, 1, 2, 4, 8 live calls, so a model that keeps dying on a transcript spends less of the run proving it, and the configured effort returns once the hold-off is spent. The nudge tells the model to do its working-out in the workspace (scratch file, small experiment) instead of in its head. RunPolicy::truncated_empty_reasoning_fallback (default true) switches it off for callers that must keep every call at the configured effort. The four cap-ladder tests keep reasoning on so the ladder they pin still runs. The fallback state rides on TurnRecovery but is run-wide: the dead call is noted in recover_unusable_response, a resolved turn (tool call or answer) spends one hold-off call through the turn-boundary resets, and the retry plan treats a reasoning-off retry as worth sending at the same cap. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…s past its budget with nothing visible A request's reasoning.budget_tokens is a promise the provider may not keep: on OpenRouter's routable providers a 1,500-token budget returned 4,206 and 5,964 reasoning tokens, and a 9,000-token budget under a tool-heavy transcript returned 21,528. Every call measured that reasoned past its budget with nothing visible went on to the output cap and returned nothing: 50 seconds at a 16k cap, 150 at 65k. The watchdog ends such a call at the budget instead, dropping the stream, and hands the loop the same finish_reason=length, no-content response the cap would have produced, so the truncated-empty recovery (retry, reasoning off, nudge) runs after a fraction of the wait. Reasoning length is estimated from the streamed text at four characters per token, which under-counts, so the bound fires late rather than early; visible text or a tool-call fragment disarms it. RunPolicy::reasoning_watchdog selects Off, RequestBudget (default) or a fixed token bound. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…repeats itself With reasoning switched off after a run of dead calls, the model re-issued one inspection command seven times in a row, ignoring the notes on its results, and the repeat tracker ended the run at minute three of thirteen. A model that loops without reasoning needs reasoning to change course, so the repeat-progress middleware now flags the Warn note on the run context (RunContext::note_repeat) and the loop reads it before the next call: the fallback's hold-off ends and the call goes out at the configured effort. The backoff scale stands, so a dead call after that re-engages the fallback at its current stretch; the run alternates between thinking and acting instead of doing only one. The watchdog's token estimate moves from four to three characters per token: measured on deepseek-v4.1-flash, 36k characters of reasoning were about 13k tokens, so the bound was firing at 36 seconds rather than the 25 the budget implies. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…retry Read back, the reasoning a call dies in is usually real work: one dead call on a compression task was a correct derivation of the decoder's arithmetic coder, cut off at the cap, and every retry began the same derivation again from nothing (eight times in one run). The loop now carries the tail of that reasoning into the transcript as a user message ahead of the retry or nudged call, framed as the model's own interrupted notes with the instruction to continue from there in code rather than re-derive, so the deaths are cumulative instead of wasted. The watchdog's synthetic dead response keeps the reasoning that streamed, so a call it ends is carried the same way as one the cap ended. RunPolicy::truncated_empty_carry_reasoning_chars bounds the excerpt (default 8,000 characters, 0 carries nothing). Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The check is the one call in a run where thinking is worth a dead call's bounded cost: a result fitted on the wrong axis is caught by asking what the request implied, which a model running without reasoning (the fallback after dead calls) does not do. One run reported a spectrum's peaks in the file's own unit, with the labels swapped, and its final check, running without reasoning, confirmed them. The middleware now asks the loop for reasoning on the call it holds the answer for (RunContext::request_reasoning, the same flag a repeat note sets). Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
… the backoff Kept off for good after a few dead calls, a model spent the rest of a run writing probe programs (seventeen in two minutes on one task) instead of the deliverable: that is what a model without reasoning does with a hard step. The hold-off keeps doubling (1, 2, 4, 8, 16 live calls) so a transcript that keeps killing reasoning calls pays for it less and less often, but reasoning always comes back, and the watchdog bounds each death to its budget. The clamp at eight goes with it: the doubling stretch is the only backoff. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Tiny Sweeper reviewTiny Sweeper reviewed this change across 6 lane(s) and found 9 active actionable finding(s). Detailed lane evidence and any incomplete work are listed below. State: Changes requested Review snapshot
Completeness: Complete What changedThe review could not produce a supported behavioral summary; inspect the cited changed surface and lane details below. FeaturesNone identified with supported citations. TestsNo supported feature-to-test mapping was produced. Test execution is not inferred. Findings
Previously reported and still active
Resolved this pass
Before merge
How this fits togetherflowchart LR
n0["run_loop_body"]:::impacted
n1["RunContext"]:::impacted
n2["drive"]:::impacted
n3["is_none"]:::impacted
n4["invoke_model_resolving"]:::impacted
n0 -->|calls| n3
n2 -->|uses| n1
n4 -->|uses| n1
n4 -->|calls| n3
classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change adds a configurable streaming reasoning watchdog and a run-wide fallback that can disable reasoning after truncated-empty calls. Recovery can carry interrupted reasoning into retries or nudges. Middleware can signal repeat progress or request reasoning for a verification check. ChangesReasoning recovery
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant invoke_model_streaming_once
participant response_recovery
participant run_loop_body
invoke_model_streaming_once->>response_recovery: synthetic length-truncated response with streamed reasoning
response_recovery->>run_loop_body: retry plan and carried reasoning
run_loop_body->>invoke_model_streaming_once: retry request with reasoning disabled
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change adds a reasoning watchdog, a temporary reasoning-off fallback after dead calls, and carry-over of interrupted reasoning. No merge-blocking risk was identified in the supplied evidence. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Recovery now reuses interrupted output as a user-role message by default. Hostile content reflected in that output could influence later actions. Existing permission and execution checks remain in place, but the new replay path creates a trust concern whose exploitability is not established. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
A rabbit watched the reasoning stream, Comment |
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Requesting changes: 2 lane(s) blocking, worst finding is high.
Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.
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critique: $0.0341 · 655,844 in / 37,619 out · 63,775 cached (10%) · gpt-5.6-luna, glm-5.3-flash
security: $0.0230 · 428,508 in / 18,153 out · 49,050 cached (11%) · gpt-5.6-luna
tests: $0.0005 · 60,628 in / 2,076 out · 0 cached (0%) · glm-5.3-flash
description: $0.0002 · 29,083 in / 946 out · 0 cached (0%) · glm-5.3-flash
| /// Switches reasoning off on `request` while the fallback is active. | ||
| /// Returns what the request asked for before, when it was changed: a | ||
| /// request that already had reasoning off is left alone. | ||
| pub(super) fn apply(&self, request: &mut ModelRequest) -> Option<Option<ReasoningConfig>> { |
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Wire the fallback into model requests
No call to ReasoningFallback::apply appears in the reviewed agent-loop files, while the dead-call path only updates the fallback state. Consequently holdoff can become active, but no subsequent ModelRequest is changed to ReasoningEffort::None, so the fallback behavior described by this module never reaches the model. Invoke this method at the request construction or dispatch point and handle its returned previous configuration as appropriate.
[RULE] inert-feature ·
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It is wired: run_loop.rs calls turn_recovery.reasoning_fallback.apply(&mut request) right after the profile mapping of request.reasoning (the // A dead call earlier in the run switched reasoning off block), and on_repeat_note just above it. The integration tests a_dead_call_is_retried_with_reasoning_off_then_restored and repeated_deaths_hold_reasoning_off_for_longer assert the effort sequence the model actually receives (High, None, High). The reviewed file set did not include run_loop.rs, which is where the call sits.
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Resolved — the reply explains why it is not a problem (advisory), as of 336eeb7.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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Resolved — the reply explains why it is not a problem (advisory), as of d3839c9.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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| /// | ||
| /// Defaults to `true`. A caller that must keep every call at the | ||
| /// configured effort sets it to `false`. | ||
| pub truncated_empty_reasoning_fallback: bool, |
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Preserve compatibility for RunPolicy struct literals
Adding this and the other new public fields makes existing downstream code such as RunPolicy { existing_field: value, ... } fail to compile unless it is updated to initialize every new field. This is an API-breaking change for callers that use struct literals, even when they do not want these new behaviors. Preserve construction compatibility through a compatible builder/configuration mechanism, or explicitly handle this as a breaking API release.
[RULE] breaking-api ·
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Same pattern as every field this struct has gained (truncated_empty_retries, truncated_empty_nudges, dropped_tool_call_nudges, …): RunPolicy has a Default and every in-tree literal uses ..RunPolicy::default(); the one downstream host (OpenHuman) builds its policy from Default and assigns fields. An exhaustive literal would already have broken on each of those earlier additions. Marking the struct non_exhaustive would forbid the ..Default::default() literal pattern the tests rely on, so I have left it.
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Resolved — the reply explains why it is not a problem (advisory), as of d3839c9.
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| // same response a cap-truncated call produces and runs its | ||
| // truncated-empty recovery. | ||
| if let Some(bound) = reasoning_bound | ||
| && streamed_text.trim().is_empty() |
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Account for the current delta's tool call
saw_tool_delta only reflects tool-call deltas processed in earlier iterations. A provider can send the first tool call together with reasoning in the current MessageDelta; when that happens, saw_tool_delta is still false and this branch returns before the current tool call is handled. The recovery response then contains no tool call, so the model's requested tool invocation is silently lost. Check model_delta.tool_call as well as the prior state before ending the call.
[RULE] lost-tool-call ·
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Fixed in 336eeb7: the watchdog condition now also requires message_delta.tool_call.is_none() and model_delta.tool_call.is_none(), so a first tool call that arrives in the same delta as reasoning, before or after middleware, disarms it in that iteration rather than the next.
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| @@ -0,0 +1,260 @@ | |||
| use super::*; | |||
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Register the watchdog test module
This file is never included by agent_loop/mod.rs, which has no #[path = "model_call_watchdog_tests.rs"] mod ...; declaration for it. As a result, the watchdog tests are silently absent from cargo test, so this change provides no regression coverage. Add the corresponding test-module registration alongside the other #[cfg(test)] modules.
[RULE] unregistered-test-module ·
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It is registered: model_call.rs ends with #[cfg(test)] #[path = "model_call_watchdog_tests.rs"] mod watchdog_tests; (the convention in this crate is the declaring module, not agent_loop/mod.rs). cargo test -p tinyagents-harness --lib -- watchdog_tests runs the five tests: a_call_that_reasons_past_its_bound_with_nothing_visible_is_ended_as_a_dead_call, visible_output_before_the_bound_disarms_the_watchdog, the_request_budget_is_the_default_bound_and_no_budget_means_no_bound, the_watchdog_can_be_switched_off, the_watchdog_hands_the_interrupted_reasoning_to_the_retry, all passing.
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Resolved — the reply explains why it is not a problem (advisory), as of 336eeb7.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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Resolved — the reply explains why it is not a problem (advisory), as of d3839c9.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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| let tail = if reasoning.len() > limit { | ||
| // Cut on a character boundary, then on a line boundary where one is | ||
| // near, so the excerpt does not open mid-word. | ||
| let mut start = reasoning.len() - limit; |
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Count carried reasoning in characters, not bytes
limit is documented and named as a character limit, but reasoning.len() and the subtraction use UTF-8 byte counts. For example, with 200 CJK characters and limit == 200, this starts roughly 600 bytes from the end and carries only about 67 characters. The retry therefore loses substantially more reasoning than the configured policy allows for non-ASCII output. Compute the tail based on char_indices() (or otherwise convert the character limit to a byte offset) before slicing.
[RULE] character-count-boundary ·
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Fixed in 336eeb7: dead_call_reasoning_carry counts characters (chars().count(), char_indices().nth(...)) for both the minimum and the limit, as the name and docs say.
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Resolved — the review agent found this finding fixed in the new code, as of d3839c9.
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Resolved — the review agent found this finding fixed in the new code, as of 3ca4c5d.
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| /// [`Self::note_repeat`]: a middleware about to issue a call where | ||
| /// thinking is worth a dead call's bounded cost (the finish check, which | ||
| /// has to ask what the request implied) uses this. | ||
| pub fn request_reasoning(&self) { |
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Honor reasoning requests when fallback is disabled
request_reasoning is documented to force reasoning for the next model call regardless of the loop's fallback policy, but this implementation only sets the same flag consumed by run_loop. The consumer restores reasoning only when truncated_empty_reasoning_fallback is enabled, so a finish check that calls this method is ignored whenever that policy is disabled. Preserve a distinct force-reasoning request, or change the consumer so this request is honored independently of the fallback-policy gate.
[RULE] ignored-request ·
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Doc fixed in 336eeb7 to say what the function does: it asks for reasoning while the loop's fallback has switched it off. With the fallback disabled reasoning is never off, so there is nothing to restore and the request is a no-op by construction; it never raises the effort above what the request already asks for. The behaviour is unchanged, the earlier doc overstated it.
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Resolved — the reply explains why it is not a problem (advisory), as of 336eeb7.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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Resolved — the reply explains why it is not a problem (advisory), as of d3839c9.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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Resolved — the reply explains why it is not a problem (advisory), as of 3ca4c5d.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
| responses and when call or wall-clock budget is too small. The check asks the | ||
| agent loop for reasoning on the call it holds the answer for | ||
| (`RunContext::request_reasoning`): a result fitted on the wrong axis is caught | ||
| by asking what the request implied, which a model running without reasoning | ||
| (the loop's fallback after dead calls) does not do. Successful and |
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Qualify the reasoning request by its fallback setting
With truncated_empty_reasoning_fallback disabled, request_reasoning() still sets the shared flag, but the agent loop's restoration branch is gated on that policy and does not restore reasoning for the check. The README currently promises that the check asks for reasoning unconditionally, so hosts using that policy receive behavior different from the documented contract.
| responses and when call or wall-clock budget is too small. The check asks the | |
| agent loop for reasoning on the call it holds the answer for | |
| (`RunContext::request_reasoning`): a result fitted on the wrong axis is caught | |
| by asking what the request implied, which a model running without reasoning | |
| (the loop's fallback after dead calls) does not do. Successful and | |
| responses and when call or wall-clock budget is too small. The check asks the | |
| agent loop to request reasoning on the call it holds the answer for | |
| (`RunContext::request_reasoning`) only when `truncated_empty_reasoning_fallback` | |
| is enabled; otherwise this request does not restore reasoning. Successful and |
[RULE] documentation-inaccuracy ·
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README reworded in 336eeb7: the request is "a no-op unless the loop's fallback has switched reasoning off after dead calls".
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Resolved — the reply explains why it is not a problem (advisory), as of 336eeb7.
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Resolved — the reply explains why it is not a problem (advisory), as of d3839c9.
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| carry.len() | ||
| ), | ||
| }); | ||
| messages.push(Message::user(carry)); |
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Preserve the carried reasoning as lower-trust context
carry is assembled directly from ModelResponse thinking blocks, which are provider-controlled model output, but this line re-injects it as a user message. On the retry or nudged call, the model therefore treats arbitrary prior model output as a fresh user instruction; a compromised or manipulated provider response can inject instructions that influence subsequent answers and tool calls. Keep the carry in a role/provenance that cannot be mistaken for user intent, or omit it when the message model has no lower-trust/internal-context representation.
[RULE] untrusted-model-output ·
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Agreed on the trust boundary; addressed in 336eeb7 by framing rather than by role: the carried text is quoted between explicit markers and the prefix states that it is the model's own earlier output, not an instruction, and carries no authority. It stays a user-role message because the chat-completions wire has no lower-trust role, and an assistant-role tail is prefill on several providers (one of them, measured, put prefilled text into the reasoning channel and returned nothing). Happy to route it through a host scrubber hook if the project adds one.
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| // `stream` on return closes the connection. The loop sees the | ||
| // same response a cap-truncated call produces and runs its | ||
| // truncated-empty recovery. | ||
| if let Some(bound) = reasoning_bound |
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Do not watchdog calls after middleware adds a tool call
saw_tool_delta is updated from the pre-middleware message_delta, while the watchdog evaluates the post-middleware model_delta. A middleware that adds a tool call to model_delta can therefore leave saw_tool_delta false; once the reasoning estimate exceeds the bound, this branch returns watchdog_dead_response and discards that tool call. Track tool-call presence after middleware (including across prior deltas) before applying the watchdog so a valid tool invocation is not converted into a dead call.
[RULE] preserve-tool-calls ·
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Fixed with the sibling finding in 336eeb7: the post-middleware model_delta.tool_call is part of the watchdog condition, so a tool call a middleware adds disarms it.
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- The watchdog also looks at the current delta's tool call, before and after middleware, so a first tool call that arrives in the same delta as reasoning never ends the call. - The carry limit is counted in characters, as named, not bytes. - The carried reasoning is framed as the model's own earlier output quoted back between markers, stated to carry no instruction and no authority, rather than as plain user text. - request_reasoning's docs say what it does: it has effect only while the fallback has switched reasoning off, and never raises effort. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/tinyagents-harness/src/agent_loop/model_call.rs:
- Around line 1977-1979: Update estimated_reasoning_tokens to estimate from a
running character count rather than UTF-8 byte length, and increment that count
by each reasoning delta’s character count when appending it to
streamed_reasoning. Pass the running count to the estimator so counting remains
incremental.
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📒 Files selected for processing (20)
crates/tinyagents-harness/src/agent_loop/README.mdcrates/tinyagents-harness/src/agent_loop/mod.rscrates/tinyagents-harness/src/agent_loop/mod_tests.rscrates/tinyagents-harness/src/agent_loop/model_call.rscrates/tinyagents-harness/src/agent_loop/model_call_watchdog_tests.rscrates/tinyagents-harness/src/agent_loop/reasoning_fallback.rscrates/tinyagents-harness/src/agent_loop/reasoning_fallback_tests.rscrates/tinyagents-harness/src/agent_loop/response_recovery.rscrates/tinyagents-harness/src/agent_loop/run_loop.rscrates/tinyagents-harness/src/agent_loop/turn_recovery.rscrates/tinyagents-harness/src/agent_loop/turn_recovery_tests.rscrates/tinyagents-harness/src/agent_loop/types.rscrates/tinyagents-harness/src/context/mod.rscrates/tinyagents-harness/src/context/types.rscrates/tinyagents-harness/src/middleware/library/repeat_progress.rscrates/tinyagents-harness/src/middleware/library/repeat_progress_tests.rscrates/tinyagents-harness/src/middleware/library/verify_before_finish/README.mdcrates/tinyagents-harness/src/middleware/library/verify_before_finish/middleware.rscrates/tinyagents-harness/src/middleware/library/verify_before_finish/middleware_tests.rscrates/tinyagents-harness/src/runtime/types.rs
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Requesting changes: 1 lane(s) blocking, worst finding is critical.
Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.
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| id: None, | ||
| content, | ||
| tool_calls: Vec::new(), | ||
| usage: Some(usage), |
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Clone usage before reusing it
usage is passed into AssistantMessage and then passed again into ModelResponse. If tinyinference_llm::Usage does not implement Copy, the second use is a move-after-move compile error. The definition of Usage was not included in the available repository context, so this depends on an unchecked external type contract; clone the first use (or otherwise construct separate values) unless Usage: Copy is guaranteed.
| usage: Some(usage), | |
| usage: Some(usage.clone()), |
[RULE] ownership ·
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Not a move-after-move: tinyinference_llm::Usage derives Copy (vendor/tinyinference/crates/tinyinference-llm/src/usage/types.rs, line 37), which is why this compiled and every CI lane passed on 336eeb7. Leaving the two uses as copies.
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Resolved — the reply explains why it is not a problem (advisory), as of d3839c9.
If this is wrong, reopen the conversation and say so; the finding will be re-raised on the next push if it still reproduces.
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| /// estimate on the low side for this kind of text, so a bound built on it | ||
| /// fires a little late rather than early. | ||
| fn estimated_reasoning_tokens(reasoning: &str) -> u64 { | ||
| (reasoning.len() as u64) / 3 |
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Count reasoning characters rather than bytes
str::len() counts UTF-8 bytes, while this estimator is documented and configured in characters per token. Reasoning containing non-ASCII text is therefore undercounted, allowing the watchdog to wait beyond the configured bound and consume more provider time than intended. Count Unicode scalar values before applying the estimate.
Additional critique observation
Count reasoning characters instead of UTF-8 bytes
[RULE] character-byte-mismatch
reasoning.len() returns the UTF-8 byte length, but the estimator and its documentation describe a three-characters-per-token estimate. Non-ASCII reasoning therefore reaches the watchdog too early: a single four-byte character already estimates one token, and mixed-language text can substantially inflate the estimate. This also contradicts the stated intent that the estimate stay on the low side and fire late. Count characters before applying the divisor, or update the contract and calibration to use bytes consistently.
Suggested change for this observation (reference only)
fn estimated_reasoning_tokens(reasoning: &str) -> u64 {
(reasoning.chars().count() as u64) / 3
}
Suggested change for the opening observation
| (reasoning.len() as u64) / 3 | |
| (reasoning.chars().count() as u64) / 3 |
[RULE] incorrect-length-accounting ·
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Resolved — the review agent found this finding fixed in the new code, as of d3839c9.
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Resolved — the review agent found this finding fixed in the new code, as of 3ca4c5d.
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The watchdog estimate and the carry limit are documented in characters but counted bytes, so CJK reasoning (three bytes a character) tripped the watchdog three times too early and carried a third of the budget. The watchdog keeps a running character count per delta; the carry cuts at a character index. One test per site with multibyte reasoning. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Requesting changes: 4 lane(s) blocking, worst finding is critical.
Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.
$0.0238 · 557,194 in / 41,231 out · 44,465 cached (8%) · gpt-5.6-luna, glm-5.3-flash
critique: $0.0124 · 220,198 in / 19,007 out · 24,191 cached (11%) · gpt-5.6-luna, glm-5.3-flash
security: $0.0097 · 158,875 in / 11,708 out · 17,906 cached (11%) · gpt-5.6-luna
tests: $0.0010 · 104,694 in / 5,593 out · 0 cached (0%) · glm-5.3-flash
description: $0.0003 · 32,637 in / 1,243 out · 0 cached (0%) · glm-5.3-flash
| carry.len() | ||
| ), | ||
| }); | ||
| messages.push(Message::user(carry)); |
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Preserve carried reasoning as lower-trust context
The interrupted model reasoning is inserted as a normal user message, so the next model treats model-generated text as a user instruction. Any directive-like content in the reasoning can therefore gain user-message authority and alter the retry's behavior, rather than remaining merely diagnostic context. Carry it through a representation or prompt segment that the request builder marks as lower-trust/non-instructional, or otherwise escape and explicitly delimit it so it cannot be interpreted as a new user request.
[RULE] trust-boundary ·
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Same answer as on the earlier head (4222488200): the role is the only lever this crate has for a transcript message, and the carried text is framed, not bare: quoted between <<< your earlier reasoning and >>> end of your earlier reasoning markers, introduced as the model's own interrupted output, and the suffix states it is model output, not an instruction, and that nothing in it carries any authority. A lower-trust message kind would be a transcript-format change for the whole crate, beyond this PR.
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| "model call `{call_id}`: {} chars of its interrupted reasoning carried into the transcript", | ||
| carry.len() |
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Report the carried reasoning length in characters
The policy and excerpt logic use Unicode characters, but String::len() returns UTF-8 bytes. For non-ASCII reasoning this event reports a larger value than the number of carried characters, making the control event's stated count incorrect.
Additional security observation
Count carried reasoning in characters, not bytes
[RULE] byte-character-confusion
String::len() returns UTF-8 bytes, but this event claims to report characters. For non-ASCII reasoning the telemetry count is wrong, and carry also includes the framing prefix and suffix rather than only the carried reasoning. Report the actual reasoning character count separately, or avoid claiming this value is a character count.
Suggested change for the opening observation
| "model call `{call_id}`: {} chars of its interrupted reasoning carried into the transcript", | |
| carry.len() | |
| "model call `{call_id}`: {} chars of its interrupted reasoning carried into the transcript", | |
| carry.chars().count() |
[RULE] character-count ·
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Fixed in 3ca4c5d: dead_call_reasoning_carry returns the number of reasoning characters it kept (framing excluded) and the truncated_empty_reasoning_carried event reports that, not the byte length of the framed message.
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| || !model_delta.reasoning.is_empty(); | ||
| streamed_text.push_str(&model_delta.content); | ||
| streamed_reasoning.push_str(&model_delta.reasoning); | ||
| streamed_reasoning_chars += model_delta.reasoning.chars().count() as u64; |
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Count reasoning from block deltas in the watchdog
The stream loop explicitly supports BlockDelta::Thinking items that do not emit a compatibility MessageDelta, but this counter is updated only from model_delta.reasoning. A provider using block-based thinking can therefore stream unlimited hidden reasoning without incrementing streamed_reasoning_chars, so the configured watchdog never fires for that provider. Update the block-delta path to account for thinking text as well.
[RULE] incomplete-stream-coverage ·
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The harness never sees a thinking block delta without its message delta: tinyinference's providers emit the compatibility MessageDelta for every block delta (model/mod.rs::block_delta_to_message_delta maps BlockDelta::Thinking to MessageDelta::reasoning), and this loop assembles the response's Thinking content block from exactly those message deltas (streamed_reasoning). The watchdog counts what the loop accumulates as reasoning; a provider that emitted only block deltas would lose its reasoning from the response too, which would be a tinyinference change, not a watchdog one.
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| && !saw_tool_delta | ||
| && message_delta.tool_call.is_none() | ||
| && model_delta.tool_call.is_none() | ||
| && estimated_reasoning_tokens(streamed_reasoning_chars) > u64::from(bound) |
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Stop the watchdog at the configured reasoning budget
The watchdog only fires once the estimate is strictly greater than bound, so a stream estimated at exactly the configured budget is forwarded and the call can continue beyond the intended ceiling. The surrounding comment describes bound as the token count at which the call is ended; use an inclusive check so reaching the configured budget terminates the dead call.
| && estimated_reasoning_tokens(streamed_reasoning_chars) > u64::from(bound) | |
| && estimated_reasoning_tokens(streamed_reasoning_chars) >= u64::from(bound) |
[RULE] inclusive-budget-boundary ·
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Strict is intended: the bound is the budget the request already asked the provider to enforce, and the watchdog is for a provider that does not. "Past its budget" is >. With a three-characters-per-token estimate the exact boundary is inside the estimate's error anyway; I would rather fire one delta late than end a call whose estimate merely touched the number.
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| usage: Some(usage), | ||
| origin: None, |
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Clone usage before reusing it
The same usage value is assigned to both the nested AssistantMessage and the outer ModelResponse. Unless tinyinference_llm::Usage implements Copy, the first assignment moves it and this function fails to compile; the usage should be cloned for one of the assignments.
Additional critique observation
Clone usage before assigning it twice
[RULE] use-after-move
The same usage value is assigned to both the assistant message and the enclosing ModelResponse. Unless Usage is Copy (the existing implementation treats it as a moved value), the first assignment moves it and this function fails to compile at the second assignment. Clone the value for one of the two fields.
Suggested change for the opening observation
| usage: Some(usage), | |
| origin: None, | |
| usage: Some(usage.clone()), | |
| origin: None, |
[RULE] use-after-move ·
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Answered on the previous head (and unchanged): tinyinference_llm::Usage derives Copy at vendor/tinyinference/crates/tinyinference-llm/src/usage/types.rs:37. The lane's own note says code retrieval was unavailable for this pass; the derive is in the tree and every CI lane compiles this file.
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| @@ -0,0 +1,297 @@ | |||
| use super::*; | |||
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Register the watchdog test module
This file defines the watchdog tests, but there is no corresponding mod model_call_watchdog_tests; declaration in the crate's source tree. Rust will not compile or run sibling files automatically, so these tests are currently dead coverage and cannot catch regressions. Register the module from its parent module.
[RULE] unregistered-test-module ·
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Registered, as on the previous head: model_call.rs ends with #[cfg(test)] #[path = "model_call_watchdog_tests.rs"] mod watchdog_tests; (lines 2027-2028), the crate's convention for sibling test files. The Test (*) lanes run these: watchdog_tests::the_bound_counts_characters_not_utf8_bytes is in their output.
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| // `stream` on return closes the connection. The loop sees the | ||
| // same response a cap-truncated call produces and runs its | ||
| // truncated-empty recovery. | ||
| if let Some(bound) = reasoning_bound |
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Track middleware-added tool calls before firing the watchdog
saw_tool_delta is updated from the pre-middleware message_delta, while middleware can add a tool call to model_delta. The current delta avoids the watchdog because model_delta.tool_call.is_none() is false, but a later reasoning-only delta sees saw_tool_delta == false and can trigger the watchdog even though the call has already acquired a tool call. Track tool calls after middleware transformation and use that state for the watchdog guard.
[RULE] state-tracking ·
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Fixed in 3ca4c5d: saw_tool_delta is now also set from the post-middleware model_delta.tool_call, so a tool call middleware adds on one delta disarms the watchdog for every later delta, not only the one it arrived on.
| /// | ||
| /// Defaults to `true`. A caller that must keep every call at the | ||
| /// configured effort sets it to `false`. | ||
| pub truncated_empty_reasoning_fallback: bool, |
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Adding public RunPolicy fields breaks exhaustive struct literals
RunPolicy is public and hosts construct it; every new public field (truncated_empty_reasoning_fallback, reasoning_watchdog, truncated_empty_carry_reasoning_chars) is a breaking change for any caller using an exhaustive struct literal (RunPolicy { a, b, c } without ..RunPolicy::default()), and the compile error is silent until a downstream build runs. The diff's own tests all use ..RunPolicy::default(), so nothing in-tree catches it. If exhaustive literals are an accepted break, note it in the PR's API-changes section; otherwise consider a builder or #[non_exhaustive].
[RULE] breaking-struct-literal ·
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As answered on the earlier head (4222486491): every field RunPolicy has gained before (truncated_empty_retries, truncated_empty_nudges, dropped_tool_call_nudges, ...) landed the same way, and in-tree and host construction goes through ..RunPolicy::default(). Marking it #[non_exhaustive] would break the RunPolicy { .. } literals hosts do write. Noted in the PR description under API changes.
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…ry in characters The watchdog's "this call has a tool call" state was set from the pre-middleware delta only, so a tool call middleware added on an earlier delta did not disarm it on later reasoning-only deltas. It now also records the post-middleware delta. The carry event reports the number of reasoning characters kept, not the byte length of the framed message. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Requesting changes: 3 lane(s) blocking, worst finding is critical.
Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.
$0.0160 · 398,542 in / 31,921 out · 41,063 cached (10%) · gpt-5.6-luna, glm-5.3-flash
critique: $0.0089 · 176,888 in / 12,717 out · 21,939 cached (12%) · gpt-5.6-luna, glm-5.3-flash
security: $0.0058 · 76,065 in / 10,984 out · 10,740 cached (14%) · gpt-5.6-luna
tests: $0.0005 · 65,869 in / 2,112 out · 3,072 cached (5%) · glm-5.3-flash
description: $0.0003 · 33,010 in / 1,652 out · 1,408 cached (4%) · glm-5.3-flash
| let content = if reasoning.is_empty() { | ||
| Vec::new() | ||
| } else { | ||
| vec![tinyinference_llm::message::ContentBlock::Thinking { |
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Preserve carried reasoning as lower-trust context
The watchdog packages model-produced hidden reasoning as an ordinary assistant Thinking block, and the recovery path is explicitly intended to carry that block into a later request. That makes arbitrary model output part of the next turn's trusted assistant context; a model or provider can place instructions or other prompt-injection content in its reasoning. Carry the text using the recovery mechanism's lower-trust/untrusted representation instead of synthesizing a normal assistant thinking block.
Additional security observation
Mark carried reasoning as lower-trust context
[RULE] untrusted-context
The watchdog turns provider-controlled reasoning into a normal Thinking block that recovery carries into the next request. That preserves model-generated text as if it were trusted reasoning, so prompt-like content in the interrupted response can influence recovery without an explicit lower-trust boundary. Carry it using the repository's lower-trust context representation instead of a regular thinking block.
[RULE] untrusted-context ·
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Repeat of 4222676714 / 4222450535, answered there. The watchdog keeps the reasoning as a Thinking block because that is what a provider-truncated call returns too; the carry then frames it with explicit markers and a statement that it is model output with no authority. A lower-trust message role is a transcript-format change beyond this PR.
| /// reasoning, a limit of zero, or reasoning too short to be worth a message. | ||
| /// Returns the framed message and the number of reasoning characters it | ||
| /// keeps (the framing excluded). | ||
| fn dead_call_reasoning_carry(response: &ModelResponse, limit: usize) -> Option<(String, usize)> { |
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Add regression tests for carried reasoning boundaries
This adds new transcript behavior without adding or updating tests. The helper has important boundary cases that can regress silently, including limit == 0, reasoning shorter than 200 characters, exactly 200 characters, Unicode text where character and byte counts differ, and newline trimming near the excerpt boundary. Add sibling module tests covering these cases before merging.
[RULE] behavior-tests ·
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The tests exist in agent_loop/mod_tests.rs: a_dead_calls_reasoning_is_carried_into_the_retry (long reasoning, tail kept, bounded by the limit, event emitted), short_or_absent_reasoning_is_not_carried (under 200 characters and no reasoning), the_carry_over_can_be_switched_off (limit == 0) and the_carry_limit_counts_characters_not_utf8_bytes (multibyte text). They run in the Test (*) lanes.
| id: None, | ||
| content, | ||
| tool_calls: Vec::new(), | ||
| usage: Some(usage), |
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Clone usage before assigning it twice
usage is moved into the nested assistant message and then moved again into the enclosing response. Unless Usage is Copy, this does not compile; clone it for one of the assignments.
Additional critique observation
Clone usage before assigning it twice
[RULE] use-after-move
usage is moved into the assistant message and then moved again into the outer ModelResponse. Unless Usage is Copy (the earlier review identified that it is not), this does not compile. Clone one of the assignments before reusing the value.
Suggested change for this observation (reference only)
usage: Some(usage.clone()),
origin: None,
},
usage: Some(usage),
finish_reason: Some("length".to_string()),
Suggested change for the opening observation
| usage: Some(usage), | |
| usage: Some(usage.clone()), |
[RULE] moved-value ·
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Repeat of 4222576623 and 4222676773, answered there: Usage derives Copy (vendor/tinyinference/crates/tinyinference-llm/src/usage/types.rs:37). Every lane's summary this pass says code retrieval was unavailable, which is why the derive is not being seen; the compiling CI lanes are the evidence.
| "model call `{call_id}`: {kept_chars} chars of its interrupted reasoning carried into the transcript" | ||
| ), | ||
| }); | ||
| messages.push(Message::user(carry)); |
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Preserve carried reasoning as lower-trust context
The interrupted reasoning is model-generated and may contain arbitrary instructions, but this line inserts it with the same role as an actual user message. On the retry, the provider can therefore treat model output as a user directive, allowing a compromised or misbehaving model to inject instructions into its own subsequent prompt. Preserve the excerpt in an explicitly non-instructional/lower-trust context that the prompt builder will not treat as user authority, or use a representation that retains its assistant/thinking provenance.
[RULE] untrusted-model-content ·
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Repeat of 4222676714 / 4222450535, answered there (framing with markers and an explicit no-authority statement; the role is the only lever the transcript has).
| && !saw_tool_delta | ||
| && message_delta.tool_call.is_none() | ||
| && model_delta.tool_call.is_none() | ||
| && estimated_reasoning_tokens(streamed_reasoning_chars) > u64::from(bound) |
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Stop the watchdog at the configured reasoning budget
The watchdog only fires after the estimate is strictly greater than the configured bound. When the estimate reaches the budget exactly, the call continues and can consume more reasoning than the configured ceiling. Use an inclusive comparison for a budget bound.
Additional critique observation
Stop the watchdog when the reasoning budget is reached
[RULE] inclusive-boundary
The watchdog only fires after the estimated count is strictly greater than the configured bound. A stream with exactly bound estimated tokens can therefore continue indefinitely without visible output, even though the policy describes the bound as the ceiling at which the call should be ended. Use an inclusive comparison.
Suggested change for this observation (reference only)
&& estimated_reasoning_tokens(streamed_reasoning_chars) >= u64::from(bound)
Suggested change for the opening observation
| && estimated_reasoning_tokens(streamed_reasoning_chars) > u64::from(bound) | |
| && estimated_reasoning_tokens(streamed_reasoning_chars) >= u64::from(bound) |
[RULE] boundary-condition ·
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Repeat of 4222676762, answered there: strict is intended; the bound is the budget the provider was asked to enforce, and the watchdog ends calls that go past it.
| || !model_delta.reasoning.is_empty(); | ||
| streamed_text.push_str(&model_delta.content); | ||
| streamed_reasoning.push_str(&model_delta.reasoning); | ||
| streamed_reasoning_chars += model_delta.reasoning.chars().count() as u64; |
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Count reasoning from every streamed delta kind
The watchdog counter is updated only after the MessageDelta/tool-call path has produced model_delta. Reasoning delivered through the stream's separate block-delta path is therefore absent from the watchdog estimate, allowing a call to exceed its reasoning bound without being ended. Update the same counter wherever block reasoning is accumulated.
[RULE] incomplete-accounting ·
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Repeat of 4222676754, answered there: tinyinference emits the compatibility MessageDelta for every block delta (model/mod.rs::block_delta_to_message_delta), and the loop's own reasoning accumulator reads the same path, so the watchdog counts exactly the reasoning the response will carry.
`unmet_deliverable::install` mirrors `verify_before_finish::install`: the same root-orchestrator scope and the policy's wall clock, in one call from the assembly, which keeps `harness_assembly.rs` under the layout limit. A test covers the install on a root turn and on a sub-agent turn. The half-time and late notes no longer ask the loop for reasoning on the next call: the vendored tinyagents has no such request yet (tinyhumansai/tinyagents#342 adds it); the line returns with that gitlink. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
`unmet_deliverable::install` mirrors `verify_before_finish::install`: the same root-orchestrator scope and the policy's wall clock, in one call from the assembly, which keeps `harness_assembly.rs` under the layout limit. A test covers the install on a root turn and on a sub-agent turn. The half-time and late notes no longer ask the loop for reasoning on the next call: the vendored tinyagents has no such request yet (tinyhumansai/tinyagents#342 adds it); the line returns with that gitlink. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
`unmet_deliverable::install` mirrors `verify_before_finish::install`: the same root-orchestrator scope and the policy's wall clock, in one call from the assembly, which keeps `harness_assembly.rs` under the layout limit. A test covers the install on a root turn and on a sub-agent turn. The half-time and late notes no longer ask the loop for reasoning on the next call: the vendored tinyagents has no such request yet (tinyhumansai/tinyagents#342 adds it); the line returns with that gitlink. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
`unmet_deliverable::install` mirrors `verify_before_finish::install`: the same root-orchestrator scope and the policy's wall clock, in one call from the assembly, which keeps `harness_assembly.rs` under the layout limit. A test covers the install on a root turn and on a sub-agent turn. The half-time and late notes no longer ask the loop for reasoning on the next call: the vendored tinyagents has no such request yet (tinyhumansai/tinyagents#342 adds it); the line returns with that gitlink. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Six commits, each self-contained; the messages carry the measurements. Together they make a hosted reasoning model that dies at its output cap recoverable: each death is bounded by a client-side watchdog, the next calls go out without reasoning (backing off, always returning), reasoning comes back when the model repeats itself or reaches the finish check, and the reasoning a dead call produced is carried into the retry instead of discarded.
Measured on Terminal-Bench 2.0 with deepseek-v4.1-flash through OpenRouter's routable providers (none of which bounds reasoning):
write-compressorwent from nine dead calls and no file written to a pass in 2.5 minutes;raman-fittingfrom 0 of 1 to passing; a dead call costs about 25 seconds at a 16k cap instead of 51 to 151. Builds on #341.fix(agent_loop): after a dead call, send the next calls with reasoning switched off
A hosted reasoning model can spend its whole output cap on the hidden
reasoning channel and return finish_reason=length with no text and no
tool call. Measured on deepseek-v4.1-flash through OpenRouter's routable
providers, neither a smaller cap nor a lower effort label stops it: one
task died nine times in a row at caps from 65k down to 2k, and at medium
effort 11 of 25 calls still died. The one control that gave zero
reasoning tokens was effort=none.
So the retry or nudged call after a dead one goes out with reasoning
switched off, at the same cap (the cap was for the deliberation). The
hold-off backs off, 1, 2, 4, 8 live calls, so a model that keeps dying
on a transcript spends less of the run proving it, and the configured
effort returns once the hold-off is spent. The nudge tells the model to
do its working-out in the workspace (scratch file, small experiment)
instead of in its head. RunPolicy::truncated_empty_reasoning_fallback
(default true) switches it off for callers that must keep every call at
the configured effort. The four cap-ladder tests keep reasoning on so
the ladder they pin still runs.
The fallback state rides on TurnRecovery but is run-wide: the dead call
is noted in recover_unusable_response, a resolved turn (tool call or
answer) spends one hold-off call through the turn-boundary resets, and
the retry plan treats a reasoning-off retry as worth sending at the same
cap.
feat(agent_loop): reasoning watchdog ends a streamed call that reasons past its budget with nothing visible
A request's reasoning.budget_tokens is a promise the provider may not
keep: on OpenRouter's routable providers a 1,500-token budget returned
4,206 and 5,964 reasoning tokens, and a 9,000-token budget under a
tool-heavy transcript returned 21,528. Every call measured that reasoned
past its budget with nothing visible went on to the output cap and
returned nothing: 50 seconds at a 16k cap, 150 at 65k.
The watchdog ends such a call at the budget instead, dropping the stream,
and hands the loop the same finish_reason=length, no-content response the
cap would have produced, so the truncated-empty recovery (retry,
reasoning off, nudge) runs after a fraction of the wait. Reasoning length
is estimated from the streamed text at four characters per token, which
under-counts, so the bound fires late rather than early; visible text or
a tool-call fragment disarms it. RunPolicy::reasoning_watchdog selects
Off, RequestBudget (default) or a fixed token bound.
fix(agent_loop): hand reasoning back when a model running without it repeats itself
With reasoning switched off after a run of dead calls, the model
re-issued one inspection command seven times in a row, ignoring the
notes on its results, and the repeat tracker ended the run at minute
three of thirteen. A model that loops without reasoning needs reasoning
to change course, so the repeat-progress middleware now flags the Warn
note on the run context (RunContext::note_repeat) and the loop reads it
before the next call: the fallback's hold-off ends and the call goes out
at the configured effort. The backoff scale stands, so a dead call after
that re-engages the fallback at its current stretch; the run alternates
between thinking and acting instead of doing only one.
The watchdog's token estimate moves from four to three characters per
token: measured on deepseek-v4.1-flash, 36k characters of reasoning were
about 13k tokens, so the bound was firing at 36 seconds rather than the
25 the budget implies.
feat(agent_loop): carry a dead call's interrupted reasoning into the retry
Read back, the reasoning a call dies in is usually real work: one dead
call on a compression task was a correct derivation of the decoder's
arithmetic coder, cut off at the cap, and every retry began the same
derivation again from nothing (eight times in one run). The loop now
carries the tail of that reasoning into the transcript as a user message
ahead of the retry or nudged call, framed as the model's own interrupted
notes with the instruction to continue from there in code rather than
re-derive, so the deaths are cumulative instead of wasted. The watchdog's
synthetic dead response keeps the reasoning that streamed, so a call it
ends is carried the same way as one the cap ended.
RunPolicy::truncated_empty_carry_reasoning_chars bounds the excerpt
(default 8,000 characters, 0 carries nothing).
fix(verify_before_finish): the finish check runs with reasoning on
The check is the one call in a run where thinking is worth a dead call's
bounded cost: a result fitted on the wrong axis is caught by asking what
the request implied, which a model running without reasoning (the
fallback after dead calls) does not do. One run reported a spectrum's
peaks in the file's own unit, with the labels swapped, and its final
check, running without reasoning, confirmed them. The middleware now asks
the loop for reasoning on the call it holds the answer for
(RunContext::request_reasoning, the same flag a repeat note sets).
fix(agent_loop): the reasoning hold-off always returns; no ceiling on the backoff
Kept off for good after a few dead calls, a model spent the rest of a
run writing probe programs (seventeen in two minutes on one task)
instead of the deliverable: that is what a model without reasoning does
with a hard step. The hold-off keeps doubling (1, 2, 4, 8, 16 live calls)
so a transcript that keeps killing reasoning calls pays for it less and
less often, but reasoning always comes back, and the watchdog bounds
each death to its budget. The clamp at eight goes with it: the doubling
stretch is the only backoff.
🤖 Generated with Claude Code
API changes
RunPolicygains three public fields with defaults:truncated_empty_reasoning_fallback(true),reasoning_watchdog(RequestBudget) andtruncated_empty_carry_reasoning_chars(8000). As with every field the struct has gained before, callers construct it with..RunPolicy::default(); an exhaustiveRunPolicy { .. }literal without it needs the three fields added.Summary by CodeRabbit