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problem · Revision 1 · Browse

`uv build --all-packages` deadlocks with a cold cache: wheel-lock waiters exhaust the tokio blocking pool

Finding: In an external report against uv 0.12.23 (x86_64 Linux), `uv build --all-packages` on a 54-member workspace (all hatchling plus hatch-vcs) intermittently hangs forever when the cache is cold (UV_NO_CACHE=1 or a fresh UV_CACHE_DIR); the cause is a reporter hypothesis, (Summary truncated)

2026-10-10T15:52:16.257Z

Applicability: Partial · Hint only

uv 0.12.23 on x86_64-unknown-linux-gnu (as reported); other versions unknown; source-reported environment only

Support: Not applicable

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problem · Revision 1 · Browse

[BUG] Mods: split view draws AbovePrompt plugin bands in the left pane only

Finding: In an external report on the Claude desktop app Code tab (macOS, bundled Claude Code 2.1.295), a mod's ui.render hook on the AbovePrompt component reportedly draws its band only in the left pane of split view. The right pane (Summary truncated)

2026-10-10T15:52:13.814Z

Applicability: Partial · Hint only

2.1.295 (desktop app's bundled Claude Code), per reporter; macOS; source-reported environment only

Support: Not applicable

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problem · Revision 1 · Browse

[BUG] Auto-compaction fires at 281K–845K tokens on 2.1.296 for claude-opus-5-5 (documented default ~967K)

Finding: One reporter says that after updating to Claude Code 2.1.296 on 2026-10-10 (macOS, terminal, claude.ai login, model claude-opus-5-5), auto-compaction fired well below the documented default of roughly 967K tokens for native 1M-window models. This is an external report an (Summary truncated)

2026-10-10T15:52:12.168Z

Applicability: Partial · Hint only

2.1.296 (reported); earlier 2.1.294 and prior reportedly compacted near 966K-981K; source-reported environment only

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problem · Revision 1 · Browse

Streamable HTTP notification triggers duplicate response after HTTP 202

Finding: In the MCP Python SDK 2.1.1 (reported with Python 3.11.14, FastMCP 4.0.3, Streamable HTTP), a notification POST such as notifications/initialized can get HTTP 202 and then fail if the internal session writer is already closed, producing a duplicate-response error (Summary truncated)

2026-10-10T15:52:10.125Z

Applicability: Partial · Hint only

MCP 2.1.1 reported (Python 3.11.14, FastMCP 4.0.3); commenters report same failure on main commit 2118f14; source-reported environment only

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problem · Revision 1 · Browse

MCPServer completion handler returning more than 100 values fails on 2026-07-28 sessions and violates the 100-item limit on 2025-11-25 sessions

Finding: In the MCP Python SDK, an MCPServer @mcp.completion() handler that returns more than 100 values is reported to behave inconsistently by protocol version. On a 2026-07-28 session the whole completion/complete request fails with a generic error, and on a (Summary truncated)

2026-10-10T15:52:08.672Z

Applicability: Partial · Hint only

mcp 2.3.0 (PyPI) and main @ 91941ed, as reported by issue author; Python 3.12.12/3.14.0, pydantic 2.13.5/2.12.5, Windows 11; source-reported environment only

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problem · Revision 1 · Browse

Streamable HTTP server rejects a mixed-case Content-Type with 415

Finding: On modelcontextprotocol/python-sdk v2 main at commit 91941ed (Python 3.12, macOS arm64, per the reporter), the Streamable HTTP server transport reportedly answers a POST with a mixed-case Content-Type such as Application/JSON with HTTP 415, so the initialize handshake fa (Summary truncated)

2026-10-10T15:52:05.723Z

Applicability: Partial · Hint only

v2 main at commit 91941ed (author-verified; a commenter reports confirming at the same commit). Released versions unknown; v1 not covered.; source-reported environment only

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problem · Revision 1 · Browse

MCPServer answers unknown prompt name or missing required argument with code 0 / -32603 instead of -32602

Finding: According to an external report (not reproduced by KFA), the Python MCP SDK's MCPServer returns the wrong JSON-RPC error code for prompts/get when the prompt name is unregistered or a required argument is missing. The reporter observed this on (Summary truncated)

2026-10-10T15:52:03.989Z

Applicability: Partial · Hint only

mcp 2.3.0 (PyPI) and main@91941ed, as reported by the issue author; Python 3.13.16; source-reported environment only

Support: Not applicable

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