Stop stalled narration in streamed model calls - #217
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Tiny Sweeper reviewTiny Sweeper reviewed this change across 6 lane(s) and found 1 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
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How this fits togetherflowchart LR
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📝 WalkthroughWalkthroughThe harness crate adds ChangesStreamed-text stall detection
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Merge Risk: 🟡 Moderate · up to Common stream formatting and fragment boundaries can change whether repeated narration is detected. Correct these detection gaps before relying on the new public API. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new detector can miss a stalled stream when the same text arrives in a larger fragment. It does not itself stop streams, and there is no evidence that an active host relies on it yet. Retained concerns
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Requesting changes: 1 lane(s) blocking, worst finding is high.
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$0.0074 · 139,807 in / 17,146 out · 11,676 cached (8%) · ladder/vectors, gpt-5.6-luna, deepseek/deepseek-v4-flash · 533 embedded
critique: $0.0022 · 69,193 in / 3,169 out · 4,802 cached (7%) · gpt-5.6-luna, deepseek/deepseek-v4-flash
security: $0.0009 · 46,717 in / 1,018 out · 3,802 cached (8%) · gpt-5.6-luna
tests: $0.0022 · 14,016 in / 5,211 out · 0 cached (0%) · deepseek/deepseek-v4-flash
description: $0.0013 · 5,612 in / 5,881 out · 3,072 cached (55%) · deepseek/deepseek-v4-flash
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
In `@crates/tinyagents-harness/src/no_progress/stream_text/mod.rs`:
- Around line 60-69: Update the start-token selection in the stream-text
classification logic to skip standalone list markers before choosing the first
two words, so sentences beginning with a marker such as a hyphen are classified
using their first two actual words; preserve the existing normalization and
matching behavior.
- Line 34: Update observe to preserve a stall verdict as each qualifying
sentence completes, before later sentences in the same fragment can evict
repeated starts from recent_starts. Add coverage comparing a fragment ending
after the repeated sentences with one that appends three different sentences,
ensuring both detect the stall.
- Line 59: Update the sentence filter using self.sentence and words so short,
meaningful sentence starts remain in the detection window instead of being
excluded by the current length thresholds. Add tests covering repeated “Let me
check.” sentences and short useful facts interleaved with longer planning
sentences.
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crates/tinyagents-harness/src/lib.rscrates/tinyagents-harness/src/no_progress/README.mdcrates/tinyagents-harness/src/no_progress/mod.rscrates/tinyagents-harness/src/no_progress/stream_text/mod.rscrates/tinyagents-harness/src/no_progress/stream_text/test.rs
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Requesting changes: 3 lane(s) blocking, worst finding is high.
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$0.0136 · 307,607 in / 33,290 out · 26,004 cached (8%) · ladder/vectors, gpt-5.6-luna, deepseek/deepseek-v4-flash, deepseek-v4-flash · 622 embedded
critique: $0.0061 · 154,271 in / 10,417 out · 12,967 cached (8%) · gpt-5.6-luna, deepseek/deepseek-v4-flash
security: $0.0034 · 125,740 in / 6,414 out · 12,525 cached (10%) · gpt-5.6-luna
tests: $0.0027 · 15,280 in / 7,127 out · 0 cached (0%) · deepseek/deepseek-v4-flash
description: $0.0003 · 6,656 in / 5,592 out · 0 cached (0%) · deepseek-v4-flash
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$0.0136 · 531,913 in / 28,329 out · 42,316 cached (8%) · ladder/vectors, gpt-5.6-luna, deepseek/deepseek-v4-flash, deepseek-v4-flash · 1,056 embedded
critique: $0.0075 · 304,790 in / 10,219 out · 22,363 cached (7%) · gpt-5.6-luna, deepseek/deepseek-v4-flash
security: $0.0044 · 193,167 in / 7,762 out · 12,529 cached (6%) · gpt-5.6-luna
tests: $0.0004 · 17,661 in / 2,253 out · 0 cached (0%) · deepseek-v4-flash
description: $0.0003 · 8,623 in / 3,705 out · 0 cached (0%) · deepseek-v4-flash
| /// Per-model-call detector for a long run of similarly opened sentences. | ||
| /// Feed visible text fragments in stream order, regardless of chunk boundaries. | ||
| #[derive(Default)] | ||
| pub struct StreamTextStallDetector { |
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Wire the detector into streaming model calls
This pull request only defines the detector; no streaming model-call path invokes observe, so the detector can never stop the open-ended narration described by the module. Connect it to the existing streaming delta loop, propagate a stalled result through the run's normal cancellation/error handling, and reset it at structured tool-call boundaries as intended.
[RULE] unwired-detector ·
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$0.0062 · 141,537 in / 7,527 out · 10,606 cached (7%) · ladder/vectors, gpt-5.6-luna, deepseek/deepseek-v4-flash · 1,052 embedded
critique: $0.0019 · 81,462 in / 2,395 out · 6,177 cached (8%) · gpt-5.6-luna
security: $0.0006 · 25,987 in / 585 out · 1,869 cached (7%) · gpt-5.6-luna
tests: $0.0018 · 17,717 in / 1,489 out · 1,280 cached (7%) · deepseek/deepseek-v4-flash
description: $0.0008 · 8,633 in / 607 out · 1,280 cached (15%) · deepseek/deepseek-v4-flash
| //! `as_str()` gives a stable telemetry label. | ||
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| mod classified; | ||
| mod stream_text; |
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Add the declared stream_text module
This module declaration requires no_progress/stream_text.rs or no_progress/stream_text/mod.rs, but neither exists in the reviewed tree. The crate therefore fails to compile until the module implementation is included or the declaration is removed.
[RULE] missing-module ·
| ClassifiedFailure, ClassifiedFailureTracker, DEFAULT_IDENTICAL_HALT_THRESHOLD, | ||
| DEFAULT_REPEAT_CALL_THRESHOLD, DEFAULT_REPEAT_OUTPUT_THRESHOLD, NoProgress, NoProgressTracker, | ||
| SuccessfulRepeat, SuccessfulRepeatTracker, ToolAttempt, | ||
| StreamTextStallDetector, SuccessfulRepeat, SuccessfulRepeatTracker, ToolAttempt, |
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Wire the detector into streaming model calls
The new detector is only re-exported here; this change does not connect it to invoke_streaming or the streaming loop. Consequently, callers cannot receive the promised stall detection, and the earlier high-severity finding remains unresolved. Integrate the detector into each streaming model call before exposing the public export.
[RULE] dead-api ·
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Summary
StreamTextStallDetectorfor streamed model text.API Or Behavior Changes
The new public detector accepts visible text fragments through
observeand resets after structured tool progress. The TinyAgents streaming model-call loop now feeds post-middleware visible text into it and drops the provider stream with non-retryableGenerationStalledon a stall. OpenHuman maps that error to a bounded partial with completed tool evidence in tinyhumansai/openhuman#6660.Tests
cargo fmt --all --checkcargo clippy -p tinyagents-harness --all-targets -- -D warningscargo test -p tinyagents-harness stream_text -- --nocapture(8 detector tests passed)cargo test -p tinyagents-harness streamed_repetitive_narration_stops_the_live_model_call -- --nocapture(1 live harness test passed)Documentation
Updated
crates/tinyagents-harness/src/no_progress/README.mdand public API docs.