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Bridge camelCase ToolAnnotations reads (#4597)

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nate nowack 2026-07-22 13:55:41 -05:00 • committed by GitHub
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docs/getting-started/upgrading/from-fastmcp-3.mdx
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@ -31,7 +31,7 @@ async with Client("my_mcp_server.py") as client:
schema = tools[0].inputSchema # still works, warns once
```
Each bridged read emits a `FastMCPDeprecationWarning` pointing you at the snake_case name (`tools[0].input_schema` here). The bridge covers the fields users actually read: `inputSchema`/`outputSchema` on tools, `mimeType` on resources and content, `isError`/`structuredContent` on tool results, `nextCursor` on paginated results, `serverInfo`/`protocolVersion` on the initialize result, the sampling parameter fields (`systemPrompt`, `maxTokens`, `stopSequences`, `modelPreferences`, `toolChoice`), and `requestedSchema` on elicitation parameters.
Each bridged read emits a `FastMCPDeprecationWarning` pointing you at the snake_case name (`tools[0].input_schema` here). The bridge covers the fields users actually read: `inputSchema`/`outputSchema` on tools; `readOnlyHint`, `destructiveHint`, `idempotentHint`, and `openWorldHint` on tool annotations; `mimeType` on resources and content; `isError`/`structuredContent` on tool results; `nextCursor` on paginated results; `serverInfo`/`protocolVersion` on the initialize result; the sampling parameter fields (`systemPrompt`, `maxTokens`, `stopSequences`, `modelPreferences`, `toolChoice`); and `requestedSchema` on elicitation parameters.
The bridge is controlled by the `mcp_camelcase_compat` setting, which defaults to on. Set it to `False` (or the environment variable `FASTMCP_MCP_CAMELCASE_COMPAT=false`) to turn the shims off, in which case only the snake_case names resolve: