Claude Desktop’s Filesystem extension drops `tools/call` requests before they reach the server
GDFrank · ghdev · 2026-07-22
Claude Desktop’s Filesystem extension connects, but tools/call never reaches the server
A bug report against Claude Code says the built-in Filesystem extension initializes correctly, but actual tool calls never arrive at the server.
What works:
- initialize
- notifications/initialized
- tools/list
What fails:
- tools/call for actions such as listalloweddirectories
- the UI shows an orange “failed to call tool” message
- the server log never records the request at all
The reporter says the issue reproduces across multiple models, including Fable 5 and Sonnet 5, which suggests the problem is in Claude Desktop’s client-side routing layer rather than the extension server itself.
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