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fix(ai): batch Anthropic parallel tool results - #41948
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Sep 26, 2026
Co-authored-by: Aiden Cline <[email protected]>
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Summary
usermessageAnthropic expects every result for one assistant tool-use response in a single immediately following
usermessage. The native AI route previously emitted oneusermessage per persisted tool-result message, which split parallel results on the wire.Checks
bun typecheck(packages/ai)bun test test/provider/anthropic-messages.test.ts test/tool-stream.test.ts test/tool-runtime.test.ts test/provider/anthropic-messages.recorded.test.ts --timeout 30000(79 passed, 1 skipped)bun x prettier --check src/protocols/anthropic-messages.ts test/provider/anthropic-messages.test.tsThe full package suite still has 11 unrelated failures on the current
v2base in existing Azure URL, Bedrock fixture, and OpenRouter reasoning tests.Requested by: @rekram1-node (Aiden Cline via Slack)