feat(ai): add experimental_onLanguageModelCallStart/End to AgentCallParameters#15034
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Mmartinrusso wants to merge 1 commit intovercel:mainfrom
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feat(ai): add experimental_onLanguageModelCallStart/End to AgentCallParameters#15034Mmartinrusso wants to merge 1 commit intovercel:mainfrom
Mmartinrusso wants to merge 1 commit intovercel:mainfrom
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…arameters Add `experimental_onLanguageModelCallStart` and `experimental_onLanguageModelCallEnd` to `AgentCallParameters`, `AgentStreamParameters`, and `ToolLoopAgentSettings`. These callbacks already exist in `generateText`/`streamText` and work at runtime via the `...options` spread but TypeScript rejects them because they are absent from `AgentCallParameters`. This change makes the type surface match the runtime behavior and enables proper observability of per-LLM-call events in agent loops. Closes vercel#14278 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Background
generateTextandstreamTextsupportexperimental_onLanguageModelCallStart/Endfor per-LLM-call observability (latency, logging). These callbacks worked at runtime throughToolLoopAgentbecause unrecognised fields in...optionsflow throughprepareCallinto the underlying call. However,AgentCallParametersdid not declare them, forcing users to useas any.Summary
experimental_onLanguageModelCallStartandexperimental_onLanguageModelCallEndtoAgentCallParametersandAgentStreamParametersToolLoopAgentSettingsso they can be set once at construction timeToolLoopAgent.generate()andToolLoopAgent.stream(), merging settings-level and call-level callbacks (same pattern asexperimental_onToolExecutionStart/End)tool-loop-agent.test-d.tsManual Verification
pnpm tsc --noEmitpasses inpackages/aipnpm vitest run src/agent/— 91/91 passAgentCallParametersandToolLoopAgentSettingswith the correct typesChecklist
Related Issues
Fixes #14278