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auth: improve ClientAuthenticator error messaging Claude Code #2621: Issue comment #2709 (comment) created by aiwebb
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Deep JSON-RPC request over stdio logs a validation error and leaves the original request pending Claude Code #2620: Issue #2751 opened by cclabadmin
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Exception in ClientSessionGroup if streamable_http MCP server is not available Claude Code #2619: Issue comment #915 (comment) created by m13v
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Flaky streamable-HTTP/SSE tests: TOCTOU port race under pytest -n auto Claude Code #2618: Issue comment #2704 (comment) created by Ar-maan05
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Exception in ClientSessionGroup if streamable_http MCP server is not available Claude Code #2617: Issue comment #915 (comment) created by mcp-claude Bot
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FastMCP crashes when tool return type uses Python 3.10+ A | B | C union syntax Claude Code #2616: Issue comment #2591 (comment) created by mcp-claude Bot
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streamable_http_client: one concurrent request HTTPStatusError tears down sibling requests Claude Code #2615: Issue comment #2604 (comment) created by mcp-claude Bot
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Duplicate initialize with changed parameters can overwrite ServerSession.client_params Claude Code #2614: Issue comment #2605 (comment) created by mcp-claude Bot
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RequestResponder.__exit__ leaks CancelledError on cancelled request, killing the stdio receive loop Claude Code #2613: Issue comment #2610 (comment) created by mcp-claude Bot
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DCR registration accepts redirect_uris with non-HTTPS / non-loopback / fragmented schemes Claude Code #2612: Issue comment #2629 (comment) created by mcp-claude Bot
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Add invalid_target to AuthorizationErrorCode (RFC 8707) Claude Code #2611: Issue comment #2641 (comment) created by mcp-claude Bot
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mcp.server.fastmcp.FastMCP HTTP transport deadlocks after ~5 sequential client sessions on Windows (companion to PrefectHQ/fastmcp#4192) Claude Code #2610: Issue comment #2653 (comment) created by mcp-claude Bot
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Streamable HTTP server silently drops in-flight request when client reuses a JSON-RPC id Claude Code #2609: Issue comment #2655 (comment) created by mcp-claude Bot
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FastMCP.run(transport="stdio") produces noisy traceback on KeyboardInterrupt instead of clean exit Claude Code #2608: Issue comment #2663 (comment) created by mcp-claude Bot
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FastMCP/stdio: in-flight tool responses dropped on stdin EOF when input is bash-redirected from a file Claude Code #2607: Issue comment #2678 (comment) created by mcp-claude Bot
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OAuthClientInformationFull.redirect_uris: pydantic strict-type-equality breaks AnyUrl(x) != AnyHttpUrl(x) round-trip Claude Code #2606: Issue comment #2687 (comment) created by mcp-claude Bot
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ClientSessionGroup attempts to use capabilities that were not advertised Claude Code #2605: Issue comment #2689 (comment) created by mcp-claude Bot
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Dead code path in MCPServer._handle_call_tool and incorrect call_tool return type Claude Code #2604: Issue comment #2695 (comment) created by mcp-claude Bot
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FastMCP: streamable_http_app() silently breaks when BaseHTTPMiddleware is added Claude Code #2603: Issue comment #2702 (comment) created by mcp-claude Bot
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Flaky streamable-HTTP/SSE tests: TOCTOU port race under pytest -n auto Claude Code #2602: Issue comment #2704 (comment) created by mcp-claude Bot
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streamable_http: early response.aclose() poisons keepalive connection, causes ~260ms latency on every subsequent tool call Claude Code #2601: Issue comment #2707 (comment) created by mcp-claude Bot
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docs(examples): fix subject-verb agreement in examples README Claude Code #2600: Issue comment #2738 (comment) created by vidigoat
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fix: prevent CRLF translation in stdio_server on Windows Claude Code #2599: Issue comment #2743 (comment) created by yyzquwu
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Avoid shell invocation for Windows npx Claude Code #2598: Issue comment #2748 (comment) created by yyzquwu
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Stateful Streamable HTTP: in-session exceptions are masked as an empty -32603; real cause only in a separate "Session crashed" log Claude Code #2597: Issue #2741 opened by SingingOwl
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