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The pattern reduces per-request tool-schema overhead by roughly 75% and narrows the model's tool-selection search space from 35 options to 5–8, addressing two concrete costs — token burn and selection accuracy — that grow with MCP server size.
The post documents a concrete failure mode — HTTP transport becoming unworkable for local multi-IDE agentic setups — and shows how a stdio coordinator pattern resolves port conflicts, restart fragility, and routing ambiguity that HTTP cannot cleanly solve in a desktop environment.
These three bugs — broken `$ref` resolution in Cline, auth header stripping in Smithery, and scanner stalls from blanket 401s — can silently break real client connections on any hosted MCP server, and the fixes are non-obvious without going through the multi-directory listing process that surfaced them.