Proxy MCP client name in local stdio server User-Agent#304
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keshavc-stripe merged 3 commits intostripe:mainfrom Mar 18, 2026
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Extract the client name from the MCP initialize request and include it in the User-Agent header sent to mcp.stripe.com. When a client like Cursor or Claude Desktop connects, the User-Agent now reads "stripe-mcp-local/0.3.1 (cursor)" instead of just "stripe-mcp-local/0.3.1". The HTTP transport creation is deferred until the first stdio message arrives, so the client name from the initialize request can be captured before any HTTP requests are made. Fixes stripe#250
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Move extractClientName and buildUserAgent into userAgent.ts so tests don't transitively import the MCP SDK's streamableHttp transport, which pulls in pkce-challenge (ESM-only) and breaks Jest in CI. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Committed-By-Agent: claude
matv-stripe
reviewed
Mar 18, 2026
| } | ||
| return BASE_USER_AGENT; | ||
| } | ||
| export {extractClientName, buildUserAgent}; |
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do we need to reexport here?
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Testing: Run that from tools/modelcontextprotocol/ |
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Committed-By-Agent: claude
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Thanks for the review and merge! |
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Summary
Extracts the MCP client name from the
initializerequest and includes it in theUser-Agentheader sent tomcp.stripe.com. When Cursor connects, the header readsstripe-mcp-local/0.3.1 (cursor)instead of the staticstripe-mcp-local/0.3.1.Changes
initializemessage forclientInfo.namebefore building headers.extractClientName(): Parses aJSONRPCMessageand returns the client name if the message is aninitializerequest withclientInfo.buildUserAgent(): Appends the client name in parentheses to the base user agent string.All messages are still forwarded unchanged - the proxy only peeks at the first message for metadata.
Testing
All CI checks pass locally:
pnpm run build- cleanpnpm run lint- cleanpnpm run prettier-check- cleanpnpm run test- 17/17 passing (6 new + 11 existing)Fixes #250
This contribution was developed with AI assistance (Claude Code).