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fix(openai): fail on a reply cut at max_tokens instead of returning partial reasoning - #1495
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…artial reasoning When a reasoning model spends the whole max_tokens budget on reasoning, an OpenAI-compatible API answers 200 with finish_reason "length", no content and a partial reasoning field. The reasoning fallback returned that fragment as a successful result, so compression stored chain-of-thought as the summary. Throw a clear error for that case and keep the fallback for replies that finished normally. Signed-off-by: Rex57 <203883624+Rex57@users.noreply.github.com>
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Walkthrough
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| Check name | Status | Explanation |
|---|---|---|
| Description Check |  |
Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | |
The title states the main change: OpenAIProvider now fails when a reply is cut at max_tokens and has no content, instead of returning partial reasoning. The raw summary confirms this change in src/pro… |
| Linked Issues check | |
Directly linked issue #1393 requires rejection of an empty-content response with finish_reason "length" and preservation of the reasoning fallback for a normally completed response. In src/providers/o… |
| Out of Scope Changes check | |
The whole pull request changes only src/providers/openai.ts, its focused regression tests, and the related release-gate fixture and scenario. Each change tests or validates the #1393 truncation behavi… |
| Docstring Coverage | |
Docstring coverage is inconclusive: files from earlier reviews still need to be rechecked within the check's analysis limits. Not blocking. |
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Explanation
The title states the main change: OpenAIProvider now fails when a reply is cut at max_tokens and has no content, instead of returning partial reasoning. The raw summary confirms this change in src/providers/openai.ts, with matching tests and a release-gate scenario. The title is specific, uses a conventional prefix, and is 85 characters long, which is within a reasonable single-line length.
Full details: Linked Issues check
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Explanation
Directly linked issue
#1393requires rejection of an empty-content response with finish_reason "length" and preservation of the reasoning fallback for a normally completed response. In src/providers/openai.ts, OpenAIProvider checks the first choice. It throws the max_tokens error when content is absent and finish_reason is "length". It keeps both reasoning and reasoning_content fallbacks for other responses. test/fetch-timeout.test.ts covers null and empty content, both reasoning fields, compress and summarize, normal stop responses, and nonempty content with finish_reason "length". scripts/release-gate/summary-recovery.mjs adds an end-to-end check that truncated reasoning fails summary and compression and is not stored. Optional warning and retry behavior is not required by#1393.
Full details: Out of Scope Changes check
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Explanation
The whole pull request changes only src/providers/openai.ts, its focused regression tests, and the related release-gate fixture and scenario. Each change tests or validates the
#1393truncation behavior. The changes do not add unrelated product behavior or unrelated documentation changes.
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Thanks for this focused fix. Current Please cover null and empty content with both reasoning fields, normally completed reasoning-only responses, and the existing nonempty-content behavior. An actual packaged CLI test against a local OpenAI-compatible fixture should confirm that truncated reasoning is rejected through compression and summarization without being stored as successful model output. Please keep these updates in this PR so the contribution remains yours. |
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@Rex57 still needed: on current main, The branch is 35 commits behind main and conflicts in |
Resolve src/providers/openai.ts by keeping main's shared timeout and authentication handling and re-applying the finish_reason check inside it. Commit what npm run docs:sync changes. Signed-off-by: Rex57 <203883624+Rex57@users.noreply.github.com>
…ged gate Provider tests now cover a reply cut at max_tokens with null or empty content and only reasoning or reasoning_content, through both compress and summarize; replies that finished normally with reasoning only (the fallback stays); and nonempty content, which is still returned even when finish_reason is "length". The packaged summary-recovery gate gains a truncated-reasoning-is-rejected scenario. Its loopback model returns finish_reason "length", null content and partial reasoning that parses as valid XML. Against the installed archive, summarize returns success: false with the max_tokens error, the compression is stored as failed (compression_failed), and the reasoning marker appears nowhere in the export. With the provider change reverted, the scenario fails because the partial reasoning is stored as the session summary. Signed-off-by: Rex57 <203883624+Rex57@users.noreply.github.com>
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Updated, as two new commits (merge, no rebase or force-push):
With the provider change reverted (main's Checks: build, #1497 is stacked on this branch; I will merge main into it separately once this settles. |
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Review comments at @README.md:
- Line 75: Update the test-count badge wording in the README and its source
counterpart from “tests passing” to “tests collected,” while preserving the
existing collected-count value and leaving scripts/docs-sync.state.json
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Keep the branch current; commit what npm run docs:sync changes. Signed-off-by: Rex57 <203883624+Rex57@users.noreply.github.com>
Take main's side for the generated statistics, then commit what npm run docs:sync changes. Signed-off-by: Rex57 <203883624+Rex57@users.noreply.github.com>
…m-usage-totals Bring in current main through the updated rohitg00#1495 branch. Resolve src/providers/openai.ts by taking main's try block (with the finish_reason check) and re-adding the usage type and recordLlmUsage call inside it; keep both imports in src/functions/status.ts. Commit what npm run docs:sync changes. Signed-off-by: Rex57 <203883624+Rex57@users.noreply.github.com>
… error The max_tokens error now reads as two sentences. The fixture and provider comments are removed; the tests already describe the behavior.
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A reply cut at max_tokens with whitespace-only content was returned as a success, so the truncation error never fired, the fallback chain did not try the next provider and the circuit breaker recorded a success. Whitespace-only content now counts as missing, so it reaches the max_tokens error, or the reasoning fallback when the reply finished normally.
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Summary
Fixes #1393.
OpenAIProviderfalls back tomessage.reasoning/reasoning_contentwhencontentis empty. A reasoning model that uses the wholemax_tokensbudget answers HTTP 200 withfinish_reason: "length", no content and a partial reasoning field, and the fallback returned that fragment as a successful result. Compression then stored chain-of-thought as the observation summary.The provider now throws a clear error for that case:
The reasoning fallback added for #627 stays for replies that finished normally.
Checks
test/fetch-timeout.test.ts: new cases for afinish_reason: "length"reply (throws) and afinish_reason: "stop"reply with reasoning only (still returned)npm run build,npm run skills:gen,npm run docs:sync(no changes),npm run skills:checknpm test: 2596 passed, 4 skippedSummary by CodeRabbit