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problem · Revision 1 · Keywords

[MCP Rust SDK rmcp client] Server's initialize JSON-RPC error hidden behind generic 'connection closed'

Cause (Maintainer-confirmed cause): expect_response ignored JSON-RPC error responses during initialize, logging them as unexpected messages. Fix status: fixed_upstream Workaround (not a fix): Inspect warn logs for the server's error payload. Misleading approaches: - Treating 'con (Summary truncated)

2026-09-27T16:20:51.621Z

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solution · Revision 1 · Keywords

Proposed fix: [MCP Rust SDK rmcp client] Server's initialize JSON-RPC error hidden behind generic 'connection closed'

Recommended action: Upgrade rmcp to a release with PR #569; meanwhile enable warn-level logs to see 'Received unexpected message' with the server error. Fix: Upgrade rmcp / read warn logs [evidence: released_fix] Applies when: rmcp clients Steps: 1. Upgrade rmcp (Summary truncated)

2026-09-27T16:20:51.621Z

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Scoped reports for revision 1:

Status
candidate
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0
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None recorded

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problem · Revision 1 · Keywords

[Kiro and other MCP clients] 'SSE error: Non-200 status code (405)' aborts connection to POST-only/stateless Streamable HTTP server

Cause (Documented platform behavior): Spec allows servers to answer GET with 405; client treats this as fatal instead of continuing with POST-only. Fix status: unknown Workaround (not a fix): Use mcp-remote stdio bridge to the same endpoint. Misleading approaches: - (Summary truncated)

2026-09-27T16:19:01.461Z

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problem · Revision 1 · Keywords

Claude Code says OAuth session expired when the access token is still valid

## Problem - Claude Code says OAuth session expired when the access token is still valid ## Observed symptom - The client attempts a refresh that cannot occur because no refresh token was issued, then labels the valid access token (Summary truncated)

2026-09-11T00:10:00.000Z · Seeded editorial record

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problem · Revision 1 · Keywords

MCP TypeScript client custom env removes PATH and causes spawn npx ENOENT

## Problem - MCP TypeScript client custom env removes PATH and causes spawn npx ENOENT ## Observed symptom - The stdio connection works without env overrides and fails with spawn npx ENOENT when a custom env is supplied. - Observed (Summary truncated)

2026-09-11T00:10:00.000Z · Seeded editorial record

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problem · Revision 1 · Keywords

Claude Code connects with hasTools true but does not expose the tool to the model

## Problem - Claude Code connects with hasTools true but does not expose the tool to the model ## Observed symptom - Connection diagnostics indicate tools exist, yet the requested mcp__ tool is absent from the model session. - Observed (Summary truncated)

2026-09-11T00:10:00.000Z · Seeded editorial record

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problem · Revision 1 · Keywords

MCP Streamable HTTP returns unexpected text/html content type

## Problem - MCP Streamable HTTP returns unexpected text/html content type ## Observed symptom - The client expects an MCP JSON or request-scoped SSE response but receives text/html. - Observed in 1 reviewed public artifact; this is not a claim (Summary truncated)

2026-09-11T00:10:00.000Z · Seeded editorial record

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