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fastmcp.server.middleware.middleware

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Functions

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make_middleware_wrapper 

make_middleware_wrapper(middleware: Middleware, call_next: CallNext[T, R]) -> CallNext[T, R]
Create a wrapper that applies a single middleware to a context. The closure bakes in the middleware and call_next function, so it can be passed to other functions that expect a call_next function.

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Classes

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CallNext

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MiddlewareContext

Unified context for all middleware operations. Methods:

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copy 

copy(self, **kwargs: Any) -> MiddlewareContext[T]

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Middleware

Base class for FastMCP middleware with dispatching hooks. Methods:

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on_message 

on_message(self, context: MiddlewareContext[Any], call_next: CallNext[Any, Any]) -> Any

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on_request 

on_request(self, context: MiddlewareContext[mt.Request], call_next: CallNext[mt.Request, Any]) -> Any

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on_notification 

on_notification(self, context: MiddlewareContext[mt.Notification], call_next: CallNext[mt.Notification, Any]) -> Any

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on_call_tool 

on_call_tool(self, context: MiddlewareContext[mt.CallToolRequestParams], call_next: CallNext[mt.CallToolRequestParams, ToolResult]) -> ToolResult

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on_read_resource 

on_read_resource(self, context: MiddlewareContext[mt.ReadResourceRequestParams], call_next: CallNext[mt.ReadResourceRequestParams, mt.ReadResourceResult]) -> mt.ReadResourceResult

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on_get_prompt 

on_get_prompt(self, context: MiddlewareContext[mt.GetPromptRequestParams], call_next: CallNext[mt.GetPromptRequestParams, mt.GetPromptResult]) -> mt.GetPromptResult

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on_list_tools 

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

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on_list_resources 

on_list_resources(self, context: MiddlewareContext[mt.ListResourcesRequest], call_next: CallNext[mt.ListResourcesRequest, list[Resource]]) -> list[Resource]

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on_list_resource_templates 

on_list_resource_templates(self, context: MiddlewareContext[mt.ListResourceTemplatesRequest], call_next: CallNext[mt.ListResourceTemplatesRequest, list[ResourceTemplate]]) -> list[ResourceTemplate]

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on_list_prompts 

on_list_prompts(self, context: MiddlewareContext[mt.ListPromptsRequest], call_next: CallNext[mt.ListPromptsRequest, list[Prompt]]) -> list[Prompt]