fix(core): fix the core defects the reviewers found, part 2

[murdore]

Summary

Nine review findings and one optional finding on the core code, in one commit. A cancel that lands during a rate-limit wait now ends the call, a 404 is no longer taken for a missing model unless the text says so, two keyless local runtimes report healthy, the OpenAI default surfaces now agree with what the runtime does, a scanned PDF and a clip with no readable duration are handled, and three comment and test cleanups are included.

It sits on release after the first part of this work (#1905, merged). The runtime model resolution, the registry defaults, config/models.json and openAI/client.ts are untouched.

What changed

Id	Thread	Change
T3792807258	#1337 (comment)	withProviderRetry takes an optional abort signal. The wait between attempts ends when it aborts, and an aborted signal is checked before every attempt and after every wait. The signal is passed at the OpenAI-wire generate and stream calls, the Anthropic and SageMaker generate calls, and the agentic loop engine.
T3792807262	#1337 (comment)	A 404 becomes InvalidModelError only when its text names a model or deployment as missing (the old "model not found" text still matches at any status; "invalid model", "no such model", "not supported", "unavailable" and "unable to access … model" also count). Any other 404 is a ProviderError reading <provider> returned HTTP 404: <message>. A wrong base URL is sent once instead of once per fallback model. NVIDIA NIM answers most of its roster with a 404 that says "Function … not found for account …", which names no model; its own rule now keys on the status, so it keeps its model fallback. Other vendors with their own 404 rules are unchanged.
T3792807268	#1337 (comment)	The key check no longer looks up an empty variable name for LM Studio and llama.cpp. They report a key as not needed and healthy. Observable effects: NeuroLink.hasProviderEnvVars("lm-studio") and ("llamacpp") now return true (they returned false on a clean release build), and getProviderStatus() now runs a real 5 s call against each (about 5 s each when no server is running) instead of reporting not-configured. Because nothing probes these two in the health check, getBestHealthyProvider's first-healthy fallback now skips local runtimes that are env-only; without that, a user whose only key was for a catalog provider would have been given LM Studio by automatic selection (reproduced on a clean build and on this commit before the guard).
F-openai-default-surface-divergence	#1823 (no thread)	modelChoices.ts: the OpenAI default is gpt-4o-mini and the top list leads with gpt-5.4. The health recommendations lead with gpt-5.4, gpt-5.4-mini. The three docs pages say the default is gpt-4o-mini and describe the order of precedence.
T3860677175	#1558 (comment)	A scanned PDF is detected from the per-page text, because pdf-parse adds a page marker after every page and the joined text is never empty. On a vision provider the inline note and the log say page images are attached.
T4135201652	#1861 (comment)	The ffmpeg metadata fallback also runs when the first reader reports no positive duration (mediabunny reports 0 for a clip it can open but not time).
T3804841913	#1351 (comment)	ProviderModelManifestEntry docs name the consumers that read it and the real helper. Comment change, generated page regenerated.
T3792807269	#1337 (comment)	The hard-coded order comment in getBestProvider is a pointer to autoSelectPriority, which now carries the rationale. Comment change, generated page regenerated.
T3813998716-c	#1354 (comment)	The clearHandlers case re-registers only its own provider instead of replaying stubs under real provider names.
T3803156915	#1349 (comment)	Not changed (optional). Both env-name fields come from one call in the only place that builds entries, so they cannot diverge.

Tests

Every case drives NeuroLink or the built CLI from dist. These were run once with the source changes reversed and once with them in place (log: rg-core-b/red.log and green.log):

• Cancel during the retry wait, four cases: OpenAI-compatible stream() and generate(), Anthropic stream() and generate(). A 429 with retry-after: 20 is answered, the caller cancels 300 ms later, and the call must settle within 5 s. Without the change each waits out the 20 s.
• Error classification (error-classification-e2e): a 404 naming no model is a ProviderError with the vendor text, is sent once, and "The model gateway route is missing" is not a missing model; three more wordings ("Invalid model", "No such model", "not supported") stay InvalidModelError; a NIM "not found for account" 404 stays InvalidModelError. The existing case that asserted the old behaviour was edited to use a body that names the model, not deleted.
• Health (provider-descriptors), three cases: LM Studio and llama.cpp are healthy without a key; automatic selection with only a Groq key and Ollama down chooses Groq, not LM Studio; the OpenAI recommendation line starts with gpt-5.4, gpt-5.4-mini.
• Scanned PDF (pdf-image-streaming): one case red; the case with a text layer stays green as a control.
• MPEG-TS clip (video-no-ffprobe): red with 0 frames, green with 2; the AVI and MP4 cases stay green. A probe on the fixture printed a mediabunny duration of 0 and an ffmpeg duration of 4.00 s.
• New suite test:model-default-resolution (4 cases, built CLI against local stand-ins): no-model generate and stream use the default from the model configuration, OPENAI_MODEL beats it, --model beats both. It is a characterization of the runtime, green before and after by design. Changing one expected model made it print a failing case and exit non-zero.
• chatStandIn gained a requestedModels() accessor; nothing else about it changed.

Gates: the author's first runs were on the tree before it was rebased onto the current release; after the rebase and after the review changes (the NIM rule, the wider 404 wording, the auto-selection guard, the cancel-case diagnostics, wording and doc corrections) the gate suites listed in the commit were run again on the final head. check:docs-api and the search index are re-checked on the final head too. On the amended head before the last rebase: build, check, lint, check:tools-tests, check:deps, check:docs-api, test:provider-structure, test:model-manifests and 23 suites that cover the changed files all pass, including test:error-classification-e2e (175 of 175) and test:provider-descriptors (70), and test:providers-mocked passes (529 of 529). After rebasing onto the newest release (an Anthropic base-URL change) the search index was regenerated (a second build changed nothing) and these were run again and pass: build, check, lint, check:tools-tests, check:deps, check:docs-api, provider-structure, model-manifests, error-classification-e2e, provider-descriptors, both streaming-retry suites, the Anthropic loop suite and the credentials suite. The full set of 23 suites and the mocked-provider suite were not repeated after that last rebase; the required provider-safety-net check runs the mocked suite on the pushed head.

Notes for review

• Cancellation reaches five of the six withProviderRetry callers. Replicate createPrediction builds its own per-attempt timeout and has no caller signal; it is unchanged.
• Without the change, a second request is not what separates red from green: after the wait the aborted signal stops the next attempt before it is sent. The timing assertion carries the proof.
• Interactive setup: Enter on the OpenAI model prompt now saves gpt-5.4 as OPENAI_MODEL, which outranks the config and registry defaults, so a user who accepts it pins gpt-5.4 while the documented default stays gpt-4o-mini. o3, gpt-4-turbo and gpt-3.5-turbo are no longer among the 5 choices shown and remain reachable as a custom model. The labels say "Direct OpenAI GPT-5.4 model" rather than "current flagship", because the enum labels the GPT-6 family the current flagship.
• The 404 rule keeps the old message-only match for every status. Only the status-only match was removed.
• docs/reference/provider-capabilities-audit.md is a dated snapshot (v9.62, May 2026) that still lists gpt-4o as the OpenAI default; it is left as a record. docs/sdk/api-reference.md and docs/rag/CLI-COVERAGE.md state the live default and were corrected.
• The same page-marker pattern exists in src/lib/files/fileReferenceRegistry.ts and src/lib/rag/document/loaders.ts. Not changed here.
• The cancel changes also reach the agentic loop engine: an abort during a rate-limit wait in the Anthropic, Vertex, AI Studio and Bedrock loops now rejects with the abort reason instead of waiting out the delay. Only the Anthropic cancel path has an end-to-end case; the loop and Bedrock suites pass.
• A turn deadline that lands during a backoff wait surfaces on the Anthropic and SageMaker generate paths as the provider's network-timeout error, where a deadline during a request still surfaces as a timeout error. Read from the code, not run.
• The 404 wording list is a heuristic. A 404 body that says something else (for example a vendor-specific phrase naming no model) is a ProviderError and does not walk the fallback models. The new ProviderError text embeds the vendor's message unredacted, as other provider errors do.

Not done

• T3803156915 (optional, see above).
• Replicate does not receive a caller signal. SageMaker generate cancellation is wired but has no end-to-end case, because the AWS SDK client has its own retry layer and a test there would measure the SDK.
• getDefaultModel, DEFAULT_MODELS and the wizard lists have no automated test: nothing shipped reaches them without an interactive prompt. The before/after printout is in modelchoices-before-after.txt.

Could not verify

• In the combined reversed run the OpenAI-compatible stream() cancel case failed on its first assertion (the first request not seen) instead of the timing assertion. Two later runs on a rebuilt reversed tree failed it on the timing assertion, and it passed with the change in every run. The cause of the first run's difference is not established. Review judged that the case cannot give a false green but could give a false red if something ends the call before the scheduled cancel; the two OpenAI cancel cases now record that the request was seen separately from the scheduled cancel, report the two conditions with separate messages, and print what ended the call.
• test:video-frames ran 2 cases and skipped 7, and test:bedrock-loop-characterization skipped 2, for missing credentials. Those skipped cases do run through code this change touches (VideoProcessor.ts, the loop engine), so they are not evidence for it.
• SageMaker generate cancellation and the Replicate path have no end-to-end case.
• The interactive setup wizard was not driven.

Summary by CodeRabbit

• New Features
  • Added GPT-5.4 and GPT-5.4 Mini to OpenAI model recommendations.
  • Model selection now follows a documented order: explicit option, environment variable, configured default, then registry default. The SDK/CLI default is GPT-4o Mini.
• Bug Fixes
  • Cancelled requests now stop waiting during provider retry delays.
  • Improved handling of scanned PDFs, videos with missing or zero-duration metadata, and provider errors for missing models.
  • Local provider health checks and automatic provider selection are more reliable.
• Documentation
  • Updated provider setup, model guidance, and OpenAI defaults.

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📝 Commit Details

• Hash: a85c22ecc7f1b24b80c9e1e282a7617ce91ab63d
• Message: fix(core): fix the core defects the reviewers found, part 2
• Author: Sachin Sharma

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📚 Code guidelines (1)

CLAUDE.md — auto-discovered

📝 Walkthrough

Walkthrough

The changes update OpenAI model defaults and selection guidance, add abort-aware provider retries, refine 404 classification and provider health selection, correct PDF text-layer messaging, and invoke video metadata fallback for non-positive durations. Tests cover these behaviors and adjust provider-registry test scope.

Changes

OpenAI model resolution

Layer / File(s)	Summary
Model defaults and metadata src/lib/utils/modelChoices.ts, src/lib/types/model.ts	OpenAI model recommendations and registry defaults are updated. Comments describe the manifest shape and derivation path.
Model selection guidance docs/getting-started/*, docs/rag/CLI-COVERAGE.md, docs/sdk/api-reference.md, docs-site/static/search-index.json	The documentation identifies gpt-4o-mini as the registry or CLI default, adds GPT-5.4 models, and describes model-selection precedence and the direct-construction fallback.
CLI model-resolution tests package.json, test/continuous-test-suite-model-default-resolution.ts, test/helpers/chatStandIn.ts	An offline CLI test checks configured defaults and precedence for OPENAI_MODEL and --model. The chat stand-in records requested model IDs.

Retry cancellation

Layer / File(s)	Summary
Abort-aware retry handling src/lib/utils/providerRetry.ts	The retry helper checks abort signals before attempts and after waits. Its delay rejects when the signal aborts.
Provider cancellation propagation src/lib/core/loopEngine.ts, src/lib/providers/amazonSagemaker.ts, src/lib/providers/anthropic/client.ts, src/lib/providers/openaiChatCompletionsBase.ts	Retry calls in these provider paths now receive their abort signals.
Retry cancellation tests test/continuous-test-suite-anthropic-streaming-retry.ts, test/continuous-test-suite-openai-compat-streaming-retry.ts	Tests check that cancellation during a long retry delay settles without another request for generate() and stream().

404 error classification

Layer / File(s)	Summary
404 classification rules src/lib/utils/errorClassifier.ts, src/lib/providers/nvidiaNim/client.ts	The shared classifier distinguishes model-related 404 messages from other 404s. NVIDIA NIM also classifies 404 responses as invalid-model errors.
404 classification coverage test/continuous-test-suite-error-classification-e2e.ts, test/continuous-test-suite-stream-tool-telemetry.ts	Tests distinguish model-specific, generic, and gateway-route 404 responses. A test comment reflects the message-sensitive rule.

Provider health and selection

Layer / File(s)	Summary
Health checks and provider selection src/lib/utils/providerHealth.ts, src/lib/utils/providerUtils.ts, src/lib/types/providers.ts	Health checks account for local runtimes and optional credentials. Healthy-provider fallback selection skips local runtimes with env-only health checks. Provider priority documentation identifies descriptor and catalog sources.
Provider health regression tests test/continuous-test-suite-provider-descriptors.ts	Tests cover local-provider health, configured-provider selection, and OpenAI common model recommendations.

PDF text and image messages

Layer / File(s)	Summary
PDF text-layer and image messaging src/lib/utils/messageBuilder.ts	Text-layer detection checks individual pages. For image-capable providers, the no-text message states that page images are attached.
PDF message tests test/continuous-test-suite-pdf-image-streaming.ts	Tests check image and message content for scanned PDFs and extracted text for PDFs with a text layer.

Video duration fallback

Layer / File(s)	Summary
Metadata fallback conditions src/lib/processors/media/VideoProcessor.ts	The ffmpeg metadata fallback runs when metadata is absent or its duration is not positive. Warnings distinguish absent metadata from unusable duration.
Zero-duration video test test/continuous-test-suite-video-no-ffprobe.ts	A video-only MPEG-TS test checks frame extraction when the initial duration is zero.

Provider registry test

Layer / File(s)	Summary
Provider registry clearing test test/continuous-test-suite-video-generation-unit.ts	The test now checks clearing and re-registering only its test provider.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant withProviderRetry
  participant ProviderAPI
  participant sleepWithTimeout
  withProviderRetry->>ProviderAPI: Send request
  ProviderAPI-->>withProviderRetry: Return retryable response
  withProviderRetry->>sleepWithTimeout: Wait with abort signal
  Caller->>sleepWithTimeout: Abort signal
  sleepWithTimeout-->>withProviderRetry: Reject with abort reason

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Merge Risk: 🔵 Low · up to a85c2

A particular gateway-route error can cause an unnecessary model fallback, while a local proxy can make a regression test fail and the model lists can mislead readers. The change is mergeable with these bounded fixes or explicit owner acceptance.

Security Architecture Review

Security architecture risk: 🔵 Low · up to a85c2

The inspected changes strengthen cancellation handling and retain existing selection and media-processing controls. No introduced security concern was established, but incomplete coverage leaves some uncertainty.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The directly inspected security-relevant scope is caller cancellation across shared provider execution and attacker-supplied media reaching local decoding and temporary-file writes. Deployment privileges, tenant isolation, and external exposure are not established by the supplied evidence.

Security Findings and Attack Paths

• inferred — No introduced or materially worsened security attack path was established in the inspected changes. This is a bounded result, not a safety conclusion for the deferred security unit or uninspected production surfaces.

Trust Boundaries and Controls

• observed — Keyless health acceptance changes readiness reporting rather than granting credentials. Standard providers retain their API-key lookup and format checks, and explicit provider choice remains authoritative.
• observed — The expanded media path retains input validation, bounded frame counts and dimensions, and request-owned temporary-directory cleanup. The newly exercised metadata probe has a ten-second timeout and bounded output capture.

Resilience and Maintainability Implications

• observed — Replicate submission still uses its own per-attempt timeout without receiving caller cancellation; cancellation reaches polling separately. Both submission code and caller reachability are unchanged by this PR, so this is a pre-existing limitation rather than an active PR concern.
• observed — The existing frame-extraction timeout rejects its promise without explicitly terminating the fluent-ffmpeg command. This lifecycle limitation predates the PR; the inspected evidence does not establish independent child termination or a newly increased maximum attacker-controlled scope.

Hardening Proposals

• proposed — As pre-existing lifecycle hardening, explicitly terminate frame-extraction children at timeout and await their exit before releasing temporary files. Promise rejection alone should not be treated as proof that decoding has stopped.

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Title check	✅ Passed	The title matches the pull request’s core fixes, but it does not name the specific changes.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 71.43% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 24 files. (7 skipped: 7 unsupported.)

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src/lib/core/loopEngine.ts

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error TS5012: Cannot read file '/.svelte-kit/tsconfig.json': ENOENT: no such file or directory, open '/.svelte-kit/tsconfig.json'.

src/lib/processors/media/VideoProcessor.ts

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src/lib/providers/amazonSagemaker.ts

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Actionable comments posted: 3

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @docs-site/static/search-index.json:
- Line 4730: Update the OpenAI supported-model lists in the environment
variables guide and its repeated indexed entries to include gpt-6-astra,
gpt-6-sol, gpt-6-luna, and gpt-5.4-nano, or clarify that the lists are examples
rather than exhaustive; keep them consistent with the OpenAI guide’s indexed
enum table.

Review comments at @src/lib/utils/errorClassifier.ts:
- Line 156: Narrow the missing-model regex in errorClassifier.ts so “not found”
messages referring to a model gateway route do not match; add a test for the
reverse-order wording “Not found: model gateway route” and verify it does not
classify the error as InvalidModelError.

Review comments at @test/continuous-test-suite-provider-descriptors.ts:
- Around line 718-719: In the provider-selection test, save the existing
LITELLM_BASE_URL and set it to an unreachable address during the test so LiteLLM
cannot be selected via its default port; restore the saved value afterward.

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⛔ Files ignored due to path filters (2)

• docs/api/type-aliases/ProviderDescriptor.md is excluded by !docs/api/**
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📒 Files selected for processing (31)

• docs-site/static/search-index.json
• docs/getting-started/environment-variables.md
• docs/getting-started/provider-setup.md
• docs/getting-started/providers/openai.md
• docs/rag/CLI-COVERAGE.md
• docs/sdk/api-reference.md
• package.json
• src/lib/core/loopEngine.ts
• src/lib/processors/media/VideoProcessor.ts
• src/lib/providers/amazonSagemaker.ts
• src/lib/providers/anthropic/client.ts
• src/lib/providers/nvidiaNim/client.ts
• src/lib/providers/openaiChatCompletionsBase.ts
• src/lib/types/model.ts
• src/lib/types/providers.ts
• src/lib/utils/errorClassifier.ts
• src/lib/utils/messageBuilder.ts
• src/lib/utils/modelChoices.ts
• src/lib/utils/providerHealth.ts
• src/lib/utils/providerRetry.ts
• src/lib/utils/providerUtils.ts
• test/continuous-test-suite-anthropic-streaming-retry.ts
• test/continuous-test-suite-error-classification-e2e.ts
• test/continuous-test-suite-model-default-resolution.ts
• test/continuous-test-suite-openai-compat-streaming-retry.ts
• test/continuous-test-suite-pdf-image-streaming.ts
• test/continuous-test-suite-provider-descriptors.ts
• test/continuous-test-suite-stream-tool-telemetry.ts
• test/continuous-test-suite-video-generation-unit.ts
• test/continuous-test-suite-video-no-ffprobe.ts
• test/helpers/chatStandIn.ts

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