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Documentation Index

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fastmcp.server.middleware.response_limiting

Response limiting middleware for controlling tool response sizes.

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Classes

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ResponseLimitingMiddleware

Middleware that limits the response size of tool calls. Intercepts tool call responses and enforces size limits. If a response exceeds the limit, it extracts text content, truncates it, and returns a single TextContent block. Methods:

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on_call_tool 

on_call_tool(self, context: MiddlewareContext[mt.CallToolRequestParams], call_next: CallNext[mt.CallToolRequestParams, ToolResult]) -> ToolResult
Intercept tool calls and limit response size.