fix: Vercel AI SDK parallel tool results + Anthropic base URL hint#55
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luokerenx4 merged 2 commits intomasterfrom Mar 14, 2026
Merged
fix: Vercel AI SDK parallel tool results + Anthropic base URL hint#55luokerenx4 merged 2 commits intomasterfrom
luokerenx4 merged 2 commits intomasterfrom
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Parallel tool calls (multiple tool_use in one step) previously flushed each tool_result as a separate user message. On the next turn, toModelMessages() would reconstruct a history where the assistant had N tool calls but each result was its own message, causing Vercel AI SDK to throw MissingToolResultsError. Fix: accumulate tool results and only flush when the next round begins (new tool_use or text event), so all results land in one user message. Adds A16 (persistence) and parallel tool call test (agent.spec) to pin the correct behaviour. Fixes #50 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@ai-sdk/anthropic constructs request URLs as `${baseURL}/messages`,
so the baseURL must already include /v1 — unlike the Anthropic SDK
which appends /v1 automatically. Added an inline hint in the channel
config modal when the anthropic provider is selected.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
MissingToolResultsErrorwhen Vercel AI SDK backend uses parallel tool calls (issue 使用Vercel AI SDK 的兼容api遇到问题 #50)/v1when using Vercel AI SDK backendRoot Cause
@ai-sdk/anthropicconstructs request URLs as${baseURL}/messages(assuming/v1is already in the base URL), whereas the Anthropic SDK appends/v1/messagesautomatically. This means the same base URL works with Agent SDK but returns 404 with Vercel AI SDK.Test plan
pnpm test— A16 parallel tool call persistence test addedMissingToolResultsErrorwith Vercel AI SDK/v1🤖 Generated with Claude Code