fix(ai): MCPClientError had to be made JSONRPC structure compliant
#9249
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lgrammel
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Oct 8, 2025
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✅ Backport PR created: #9335 |
aayush-kapoor
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Oct 9, 2025
…compliant (#9335) This is an automated backport of #9249 to the release-v5.0 branch. Co-authored-by: Aayush Kapoor <[email protected]>
vercel-ai-sdk bot
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Oct 9, 2025
…9249) ## Background The JSONRPC spec (for MCP) has a `data` field which is important for doing [x402 over mcp](https://github.com/coinbase/x402/blob/main/specs/transports/mcp.md#payment-required-signaling) The AI-SDK didn't expose `error.data`, only `error.message` ## Summary added the `data` property to the MCPClientError to capture the `error.data` from the response ## Manual Verification Added unit test ## Checklist - [x] Tests have been added / updated (for bug fixes / features) - [ ] Documentation has been added / updated (for bug fixes / features) - [x] A _patch_ changeset for relevant packages has been added (for bug fixes / features - run `pnpm changeset` in the project root) - [x] Formatting issues have been fixed (run `pnpm prettier-fix` in the project root) ## Related Issues Fixes #9248
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Background
The JSONRPC spec (for MCP) has a
datafield which is important for doing x402 over mcpThe AI-SDK didn't expose
error.data, onlyerror.messageSummary
added the
dataproperty to the MCPClientError to capture theerror.datafrom the responseManual Verification
Added unit test
Checklist
pnpm changesetin the project root)pnpm prettier-fixin the project root)Related Issues
Fixes #9248