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106 lines
5.3 KiB
Text
106 lines
5.3 KiB
Text
---
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title: middleware
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sidebarTitle: middleware
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---
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# `fastmcp.server.middleware.middleware`
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## Functions
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### `make_middleware_wrapper` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L67" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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make_middleware_wrapper(middleware: Middleware, call_next: CallNext[T, R]) -> CallNext[T, R]
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```
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Create a wrapper that applies a single middleware to a context. The
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closure bakes in the middleware and call_next function, so it can be
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passed to other functions that expect a call_next function.
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## Classes
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### `CallNext` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L43" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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### `MiddlewareContext` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L48" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Unified context for all middleware operations.
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**Methods:**
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#### `copy` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L63" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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copy(self, **kwargs: Any) -> MiddlewareContext[T]
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```
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### `Middleware` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L80" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Base class for FastMCP middleware with dispatching hooks.
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**Methods:**
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#### `on_message` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L127" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_message(self, context: MiddlewareContext[Any], call_next: CallNext[Any, Any]) -> Any
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```
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#### `on_request` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L134" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_request(self, context: MiddlewareContext[mt.Request], call_next: CallNext[mt.Request, Any]) -> Any
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```
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#### `on_notification` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L141" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_notification(self, context: MiddlewareContext[mt.Notification], call_next: CallNext[mt.Notification, Any]) -> Any
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```
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#### `on_call_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L148" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_call_tool(self, context: MiddlewareContext[mt.CallToolRequestParams], call_next: CallNext[mt.CallToolRequestParams, ToolResult]) -> ToolResult
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```
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#### `on_read_resource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L155" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_read_resource(self, context: MiddlewareContext[mt.ReadResourceRequestParams], call_next: CallNext[mt.ReadResourceRequestParams, list[ReadResourceContents]]) -> list[ReadResourceContents]
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```
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#### `on_get_prompt` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L162" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_get_prompt(self, context: MiddlewareContext[mt.GetPromptRequestParams], call_next: CallNext[mt.GetPromptRequestParams, mt.GetPromptResult]) -> mt.GetPromptResult
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```
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#### `on_list_tools` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L169" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_list_tools(self, context: MiddlewareContext[mt.ListToolsRequest], call_next: CallNext[mt.ListToolsRequest, list[Tool]]) -> list[Tool]
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```
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#### `on_list_resources` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L176" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_list_resources(self, context: MiddlewareContext[mt.ListResourcesRequest], call_next: CallNext[mt.ListResourcesRequest, list[Resource]]) -> list[Resource]
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```
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#### `on_list_resource_templates` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L183" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_list_resource_templates(self, context: MiddlewareContext[mt.ListResourceTemplatesRequest], call_next: CallNext[mt.ListResourceTemplatesRequest, list[ResourceTemplate]]) -> list[ResourceTemplate]
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```
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#### `on_list_prompts` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/middleware.py#L190" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_list_prompts(self, context: MiddlewareContext[mt.ListPromptsRequest], call_next: CallNext[mt.ListPromptsRequest, list[Prompt]]) -> list[Prompt]
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```
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