# Source: https://gofastmcp.com/python-sdk/fastmcp-server-providers-proxy.md

> ## Documentation Index
> Fetch the complete documentation index at: https://gofastmcp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# proxy

# `fastmcp.server.providers.proxy`

ProxyProvider for proxying to remote MCP servers.

This module provides the `ProxyProvider` class that proxies components from
a remote MCP server via a client factory. It also provides proxy component
classes that forward execution to remote servers.

## Functions

### `default_proxy_roots_handler` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L713" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
default_proxy_roots_handler(context: RequestContext[ClientSession, LifespanContextT]) -> RootsList
```

Forward list roots request from remote server to proxy's connected clients.

### `default_proxy_sampling_handler` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L721" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
default_proxy_sampling_handler(messages: list[mcp.types.SamplingMessage], params: mcp.types.CreateMessageRequestParams, context: RequestContext[ClientSession, LifespanContextT]) -> mcp.types.CreateMessageResult
```

Forward sampling request from remote server to proxy's connected clients.

### `default_proxy_elicitation_handler` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L744" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
default_proxy_elicitation_handler(message: str, response_type: type, params: mcp.types.ElicitRequestParams, context: RequestContext[ClientSession, LifespanContextT]) -> ElicitResult
```

Forward elicitation request from remote server to proxy's connected clients.

### `default_proxy_log_handler` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L766" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
default_proxy_log_handler(message: LogMessage) -> None
```

Forward log notification from remote server to proxy's connected clients.

### `default_proxy_progress_handler` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L774" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
default_proxy_progress_handler(progress: float, total: float | None, message: str | None) -> None
```

Forward progress notification from remote server to proxy's connected clients.

## Classes

### `ProxyTool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L66" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

A Tool that represents and executes a tool on a remote server.

**Methods:**

#### `model_copy` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L83" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
model_copy(self, **kwargs: Any) -> ProxyTool
```

Override to preserve \_backend\_name when name changes.

#### `from_mcp_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L93" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
from_mcp_tool(cls, client_factory: ClientFactoryT, mcp_tool: mcp.types.Tool) -> ProxyTool
```

Factory method to create a ProxyTool from a raw MCP tool schema.

#### `run` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L110" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
run(self, arguments: dict[str, Any], context: Context | None = None) -> ToolResult
```

Executes the tool by making a call through the client.

#### `get_span_attributes` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L156" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
get_span_attributes(self) -> dict[str, Any]
```

### `ProxyResource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L163" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

A Resource that represents and reads a resource from a remote server.

**Methods:**

#### `model_copy` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L188" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
model_copy(self, **kwargs: Any) -> ProxyResource
```

Override to preserve \_backend\_uri when uri changes.

#### `from_mcp_resource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L198" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
from_mcp_resource(cls, client_factory: ClientFactoryT, mcp_resource: mcp.types.Resource) -> ProxyResource
```

Factory method to create a ProxyResource from a raw MCP resource schema.

#### `read` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L218" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
read(self) -> ResourceResult
```

Read the resource content from the remote server.

#### `get_span_attributes` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L263" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
get_span_attributes(self) -> dict[str, Any]
```

### `ProxyTemplate` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L270" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

A ResourceTemplate that represents and creates resources from a remote server template.

**Methods:**

#### `model_copy` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L287" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
model_copy(self, **kwargs: Any) -> ProxyTemplate
```

Override to preserve \_backend\_uri\_template when uri\_template changes.

#### `from_mcp_template` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L297" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
from_mcp_template(cls, client_factory: ClientFactoryT, mcp_template: mcp.types.ResourceTemplate) -> ProxyTemplate
```

Factory method to create a ProxyTemplate from a raw MCP template schema.

#### `create_resource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L316" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
create_resource(self, uri: str, params: dict[str, Any], context: Context | None = None) -> ProxyResource
```

Create a resource from the template by calling the remote server.

#### `get_span_attributes` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L378" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
get_span_attributes(self) -> dict[str, Any]
```

### `ProxyPrompt` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L385" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

A Prompt that represents and renders a prompt from a remote server.

**Methods:**

#### `model_copy` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L402" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
model_copy(self, **kwargs: Any) -> ProxyPrompt
```

Override to preserve \_backend\_name when name changes.

#### `from_mcp_prompt` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L412" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
from_mcp_prompt(cls, client_factory: ClientFactoryT, mcp_prompt: mcp.types.Prompt) -> ProxyPrompt
```

Factory method to create a ProxyPrompt from a raw MCP prompt schema.

#### `render` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L436" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
render(self, arguments: dict[str, Any]) -> PromptResult
```

Render the prompt by making a call through the client.

#### `get_span_attributes` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L458" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
get_span_attributes(self) -> dict[str, Any]
```

### `ProxyProvider` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L470" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Provider that proxies to a remote MCP server via a client factory.

This provider fetches components from a remote server and returns Proxy\*
component instances that forward execution to the remote server.

All components returned by this provider have task\_config.mode="forbidden"
because tasks cannot be executed through a proxy.

**Methods:**

#### `get_tasks` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L595" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
get_tasks(self) -> Sequence[FastMCPComponent]
```

Return empty list since proxy components don't support tasks.

Override the base implementation to avoid calling list\_tools() during
server lifespan initialization, which would open the client before any
context is set. All Proxy\* components have task\_config.mode="forbidden".

### `FastMCPProxy` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L666" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

A FastMCP server that acts as a proxy to a remote MCP-compliant server.

This is a convenience wrapper that creates a FastMCP server with a
ProxyProvider. For more control, use FastMCP with add\_provider(ProxyProvider(...)).

### `ProxyClient` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L784" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

A proxy client that forwards advanced interactions between a remote MCP server and the proxy's connected clients.

Supports forwarding roots, sampling, elicitation, logging, and progress.

### `StatefulProxyClient` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L821" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

A proxy client that provides a stateful client factory for the proxy server.

The stateful proxy client bound its copy to the server session.
And it will be disconnected when the session is exited.

This is useful to proxy a stateful mcp server such as the Playwright MCP server.
Note that it is essential to ensure that the proxy server itself is also stateful.

**Methods:**

#### `clear` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L841" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
clear(self)
```

Clear all cached clients and force disconnect them.

#### `new_stateful` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/providers/proxy.py#L847" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python  theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
new_stateful(self) -> Client[ClientTransportT]
```

Create a new stateful proxy client instance with the same configuration.

Use this method as the client factory for stateful proxy server.