fix(ai): reporting ignored sampling never reads the catalogue before the gateway is asked

[sebyx07]

Regression in 27.10.0, found by an app that registers its model catalogue when its gateway is first built (a lazy gateway behind configureAi).

27.10.0 added the llm.sampling.ignored span attribute at the TOP of agent() (agent.ts:199) and llm() (llm.ts:185). Computing it calls modelSpec() (sampling.ts:77) before aiGateway() is consulted, so in such an app every agent()/llm() call failed with X_AI_MODEL_UNKNOWN (registered: none), even when no temperature/seed was asked for. In 27.9.0 nothing read the catalogue before the gateway.

Fix: ignoredSampling returns [] without reading a row when no setting was asked for; the attribute is set when the run ends (answered or failed, and on an llm() cache hit) and is left out if the model is still unregistered. A span attribute never fails the call it describes.

Test lazy-catalogue.test.ts reproduces the app's setup (a lazy gateway that registers on first build) for agent() and llm(), with and without sampling: 4 of 4 red before, green after. bun test --isolate packages/ai: 864 pass, 0 fail. Confirmed in the app: its failing job test passes with the patched files.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • AI calls now avoid unnecessary model-catalogue lookups when no sampling options are requested, and can proceed when a model is registered on first use.
  • Unsupported sampling options are reported after a call completes, including on failures and cache hits. If a model is not registered, the call’s failure is no longer replaced by a telemetry error.
• Documentation
  • Added a changelog entry describing the updated sampling telemetry behavior.

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⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 08cbb42 and d271f63.

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📒 Files selected for processing (2)

• packages/ai/src/lazy-catalogue.test.ts
• packages/ai/src/sampling.ts

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📝 Walkthrough

📝 Walkthrough

📝 Walkthrough

Walkthrough

Agent and LLM calls now set llm.sampling.ignored when reporting completes. Sampling requests without knobs avoid model-row reads, and calls for unregistered models omit the attribute.

Changes

Sampling telemetry

Layer / File(s)	Summary
Sampling attribute rules packages/ai/src/sampling.ts	Requests without sampling knobs return no ignored knobs without reading the model row. Requests for unregistered models omit the attribute.
Deferred reporting in agent and LLM calls packages/ai/src/agent.ts, packages/ai/src/llm.ts, packages/ai/src/lazy-catalogue.test.ts, CHANGELOG.md	Agent and LLM calls report ignored sampling at completion, including on failures. LLM cache hits also report. Tests cover lazy gateway initialization and ignored sampling attributes. The changelog describes the behavior.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix

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Merge Risk: 🔵 Low · up to 08cbb

Calls using a gateway whose sampling hook throws could return a reporting error instead of their answer or original error. Guard reporting before merging; add tests for the changed reporting paths.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 4 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the main fix: preventing ignored-sampling reporting from reading the model catalogue before the gateway is called.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 4 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @packages/ai/src/agent.ts:
- Around line 200-207: Make sampling telemetry best-effort in agent() and llm()
by preventing exceptions from reportSampling, including those from the installed
gateway’s optional samplingWires method, from changing the call result. Guard
the telemetry work in both reportSampling implementations so agent and non-cache
llm results remain intact, and cache hits cannot fail while reporting sampling.

Review comments at @packages/ai/src/lazy-catalogue.test.ts:
- Around line 72-99: Extend the lazy catalogue tests around `lazyAgent()` and
`declare()` with separate cases asserting that a failed run still records
`llm.sampling.ignored`, an uncatalogued provider-served model preserves the
call’s original error and omits the reporting attribute without raising
`X_AI_MODEL_UNKNOWN`, and an `llm()` semantic-cache hit records
`llm.sampling.ignored`. Update the existing cache test to assert the attribute
as well as provider-call count.

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• Configuration used: Repository: developerz-ai/ultimate/.coderabbit.yml
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📥 Commits

Reviewing files that changed from the base of the PR and between 1655092 and 08cbb42.

📒 Files selected for processing (5)

• CHANGELOG.md
• packages/ai/src/agent.ts
• packages/ai/src/lazy-catalogue.test.ts
• packages/ai/src/llm.ts
• packages/ai/src/sampling.ts

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