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196 lines
6.5 KiB
Text
196 lines
6.5 KiB
Text
---
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title: __init__
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sidebarTitle: __init__
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---
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# `fastmcp.server.transforms`
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Transform system for component transformations.
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Transforms modify components (tools, resources, prompts) using a middleware pattern.
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Each transform wraps the next in the chain via `call_next`, allowing transforms to
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intercept, modify, or replace component queries.
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Unlike middleware (which operates on requests), transforms are observable by the
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system for task registration, tag filtering, and component introspection.
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Example:
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```python
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from fastmcp import FastMCP
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from fastmcp.server.transforms import Namespace
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server = FastMCP("Server")
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mount = server.mount(other_server)
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mount.add_transform(Namespace("api")) # Tools become api_toolname
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```
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## Classes
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### `GetToolNext` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L43" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Protocol for get_tool call_next functions.
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### `GetResourceNext` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L51" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Protocol for get_resource call_next functions.
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### `GetResourceTemplateNext` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L59" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Protocol for get_resource_template call_next functions.
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### `GetPromptNext` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L67" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Protocol for get_prompt call_next functions.
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### `Transform` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L75" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Base class for component transformations.
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Transforms use a middleware pattern with `call_next` to chain operations.
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Each transform can intercept, modify, or pass through component queries.
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For list operations, call `call_next()` to get components from downstream,
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then transform the result. For get operations, optionally transform the
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name/uri before calling `call_next`, then transform the result.
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**Methods:**
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#### `list_tools` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L106" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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list_tools(self, call_next: ListToolsNext) -> Sequence[Tool]
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```
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List tools with transformation applied.
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**Args:**
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- `call_next`: Callable to get tools from downstream transforms/provider.
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**Returns:**
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- Transformed sequence of tools.
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#### `get_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L117" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_tool(self, name: str, call_next: GetToolNext) -> Tool | None
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```
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Get a tool by name.
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**Args:**
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- `name`: The requested tool name (may be transformed).
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- `call_next`: Callable to get tool from downstream.
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- `version`: Optional version filter to apply.
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**Returns:**
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- The tool if found, None otherwise.
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#### `list_resources` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L136" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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list_resources(self, call_next: ListResourcesNext) -> Sequence[Resource]
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```
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List resources with transformation applied.
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**Args:**
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- `call_next`: Callable to get resources from downstream transforms/provider.
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**Returns:**
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- Transformed sequence of resources.
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#### `get_resource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L147" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_resource(self, uri: str, call_next: GetResourceNext) -> Resource | None
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```
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Get a resource by URI.
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**Args:**
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- `uri`: The requested resource URI (may be transformed).
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- `call_next`: Callable to get resource from downstream.
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- `version`: Optional version filter to apply.
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**Returns:**
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- The resource if found, None otherwise.
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#### `list_resource_templates` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L170" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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list_resource_templates(self, call_next: ListResourceTemplatesNext) -> Sequence[ResourceTemplate]
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```
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List resource templates with transformation applied.
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**Args:**
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- `call_next`: Callable to get templates from downstream transforms/provider.
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**Returns:**
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- Transformed sequence of resource templates.
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#### `get_resource_template` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L183" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_resource_template(self, uri: str, call_next: GetResourceTemplateNext) -> ResourceTemplate | None
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```
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Get a resource template by URI.
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**Args:**
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- `uri`: The requested template URI (may be transformed).
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- `call_next`: Callable to get template from downstream.
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- `version`: Optional version filter to apply.
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**Returns:**
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- The resource template if found, None otherwise.
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#### `list_prompts` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L206" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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list_prompts(self, call_next: ListPromptsNext) -> Sequence[Prompt]
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```
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List prompts with transformation applied.
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**Args:**
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- `call_next`: Callable to get prompts from downstream transforms/provider.
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**Returns:**
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- Transformed sequence of prompts.
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#### `get_prompt` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/transforms/__init__.py#L217" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_prompt(self, name: str, call_next: GetPromptNext) -> Prompt | None
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```
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Get a prompt by name.
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**Args:**
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- `name`: The requested prompt name (may be transformed).
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- `call_next`: Callable to get prompt from downstream.
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- `version`: Optional version filter to apply.
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**Returns:**
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- The prompt if found, None otherwise.
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