`fastmcp.server.middleware.response_limiting`

Response limiting middleware for controlling tool response sizes.

Classes

`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:

`on_list_tools`

on_list_tools(self, context: MiddlewareContext[mt.ListToolsRequest], call_next: CallNext[mt.ListToolsRequest, Sequence[Tool]]) -> Sequence[Tool]

Hide schemas for tools whose response shape may be truncated to text.

`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.

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