> ## Documentation Index
> Fetch the complete documentation index at: https://gofastmcp.com/llms.txt
> Use this file to discover all available pages before exploring further.
# middleware
# `fastmcp.server.middleware.middleware`
## Functions
### `make_middleware_wrapper`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
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.
## Classes
### `CallNext`
### `MiddlewareContext`
Unified context for all middleware operations.
**Methods:**
#### `copy`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
copy(self, **kwargs: Any) -> MiddlewareContext[T]
```
### `Middleware`
Base class for FastMCP middleware with dispatching hooks.
**Methods:**
#### `on_message`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_message(self, context: MiddlewareContext[Any], call_next: CallNext[Any, Any]) -> Any
```
#### `on_request`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_request(self, context: MiddlewareContext[mt.Request[Any, Any]], call_next: CallNext[mt.Request[Any, Any], Any]) -> Any
```
#### `on_notification`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_notification(self, context: MiddlewareContext[mt.Notification[Any, Any]], call_next: CallNext[mt.Notification[Any, Any], Any]) -> Any
```
#### `on_initialize`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_initialize(self, context: MiddlewareContext[mt.InitializeRequest], call_next: CallNext[mt.InitializeRequest, mt.InitializeResult | None]) -> mt.InitializeResult | None
```
#### `on_call_tool`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_call_tool(self, context: MiddlewareContext[mt.CallToolRequestParams], call_next: CallNext[mt.CallToolRequestParams, ToolResult]) -> ToolResult
```
#### `on_read_resource`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_read_resource(self, context: MiddlewareContext[mt.ReadResourceRequestParams], call_next: CallNext[mt.ReadResourceRequestParams, ResourceResult]) -> ResourceResult
```
#### `on_get_prompt`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_get_prompt(self, context: MiddlewareContext[mt.GetPromptRequestParams], call_next: CallNext[mt.GetPromptRequestParams, PromptResult]) -> PromptResult
```
#### `on_list_tools`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_list_tools(self, context: MiddlewareContext[mt.ListToolsRequest], call_next: CallNext[mt.ListToolsRequest, Sequence[Tool]]) -> Sequence[Tool]
```
#### `on_list_resources`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_list_resources(self, context: MiddlewareContext[mt.ListResourcesRequest], call_next: CallNext[mt.ListResourcesRequest, Sequence[Resource]]) -> Sequence[Resource]
```
#### `on_list_resource_templates`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_list_resource_templates(self, context: MiddlewareContext[mt.ListResourceTemplatesRequest], call_next: CallNext[mt.ListResourceTemplatesRequest, Sequence[ResourceTemplate]]) -> Sequence[ResourceTemplate]
```
#### `on_list_prompts`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
on_list_prompts(self, context: MiddlewareContext[mt.ListPromptsRequest], call_next: CallNext[mt.ListPromptsRequest, Sequence[Prompt]]) -> Sequence[Prompt]
```