fastmcp/docs/python-sdk/fastmcp-resources-template.mdx

---
title: template
sidebarTitle: template
---

# `fastmcp.resources.template`


Resource template functionality.

## Functions

### `extract_query_params` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L39" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
extract_query_params(uri_template: str) -> set[str]
```


Extract query parameter names from RFC 6570 `{?param1,param2}` syntax.


### `build_regex` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L47" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
build_regex(template: str) -> re.Pattern[str] | None
```


Build regex pattern for URI template, handling RFC 6570 syntax.

Supports:
- `{var}` - simple path parameter
- `{var*}` - wildcard path parameter (captures multiple segments)
- `{?var1,var2}` - query parameters (ignored in path matching)

Returns None if the template produces an invalid regex (e.g. parameter
names with hyphens, leading digits, or duplicates from a remote server).


### `match_uri_template` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L79" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
match_uri_template(uri: str, uri_template: str) -> dict[str, str] | None
```


Match URI against template and extract both path and query parameters.

Supports RFC 6570 URI templates:
- Path params: `{var}`, `{var*}`
- Query params: `{?var1,var2}`


## Classes

### `ResourceTemplate` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L112" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


A template for dynamically creating resources.


**Methods:**

#### `from_function` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L139" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
from_function(fn: Callable[..., Any], uri_template: str, name: str | None = None, version: str | int | None = None, title: str | None = None, description: str | None = None, icons: list[Icon] | None = None, mime_type: str | None = None, tags: set[str] | None = None, annotations: Annotations | None = None, meta: dict[str, Any] | None = None, task: bool | TaskConfig | None = None, auth: AuthCheck | list[AuthCheck] | None = None) -> FunctionResourceTemplate
```

#### `set_default_mime_type` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L172" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
set_default_mime_type(cls, mime_type: str | None) -> str
```

Set default MIME type if not provided.


#### `matches` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L178" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
matches(self, uri: str) -> dict[str, Any] | None
```

Check if URI matches template and extract parameters.


#### `read` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L182" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
read(self, arguments: dict[str, Any]) -> str | bytes | ResourceResult
```

Read the resource content.


#### `convert_result` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L188" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
convert_result(self, raw_value: Any) -> ResourceResult
```

Convert a raw result to ResourceResult.

This is used in two contexts:
1. In _read() to convert user function return values to ResourceResult
2. In tasks_result_handler() to convert Docket task results to ResourceResult

Handles ResourceResult passthrough and converts raw values using
ResourceResult's normalization.


#### `create_resource` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L252" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
create_resource(self, uri: str, params: dict[str, Any]) -> Resource
```

Create a resource from the template with the given parameters.

The base implementation does not support background tasks.
Use FunctionResourceTemplate for task support.


#### `to_mcp_template` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L263" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
to_mcp_template(self, **overrides: Any) -> SDKResourceTemplate
```

Convert the resource template to an SDKResourceTemplate.


#### `from_mcp_template` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L283" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
from_mcp_template(cls, mcp_template: SDKResourceTemplate) -> ResourceTemplate
```

Creates a FastMCP ResourceTemplate from a raw MCP ResourceTemplate object.


#### `key` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L296" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
key(self) -> str
```

The globally unique lookup key for this template.


#### `register_with_docket` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L301" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
register_with_docket(self, docket: Docket) -> None
```

Register this template with docket for background execution.


#### `add_to_docket` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L307" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
add_to_docket(self, docket: Docket, params: dict[str, Any], **kwargs: Any) -> Execution
```

Schedule this template for background execution via docket.

**Args:**
- `docket`: The Docket instance
- `params`: Template parameters
- `fn_key`: Function lookup key in Docket registry (defaults to self.key)
- `task_key`: Redis storage key for the result
- `**kwargs`: Additional kwargs passed to docket.add()


#### `get_span_attributes` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L330" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
get_span_attributes(self) -> dict[str, Any]
```

### `FunctionResourceTemplate` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L337" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


A template for dynamically creating resources.


**Methods:**

#### `create_resource` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L383" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
create_resource(self, uri: str, params: dict[str, Any]) -> Resource
```

Create a resource from the template with the given parameters.


#### `read` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L402" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
read(self, arguments: dict[str, Any]) -> str | bytes | ResourceResult
```

Read the resource content.


#### `register_with_docket` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L441" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
register_with_docket(self, docket: Docket) -> None
```

Register this template with docket for background execution.

FunctionResourceTemplate registers the underlying function, which has the
user's Depends parameters for docket to resolve.


#### `add_to_docket` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L451" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
add_to_docket(self, docket: Docket, params: dict[str, Any], **kwargs: Any) -> Execution
```

Schedule this template for background execution via docket.

FunctionResourceTemplate splats the params dict since .fn expects **kwargs.

**Args:**
- `docket`: The Docket instance
- `params`: Template parameters
- `fn_key`: Function lookup key in Docket registry (defaults to self.key)
- `task_key`: Redis storage key for the result
- `**kwargs`: Additional kwargs passed to docket.add()


#### `from_function` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/resources/template.py#L477" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
from_function(cls, fn: Callable[..., Any], uri_template: str, name: str | None = None, version: str | int | None = None, title: str | None = None, description: str | None = None, icons: list[Icon] | None = None, mime_type: str | None = None, tags: set[str] | None = None, annotations: Annotations | None = None, meta: dict[str, Any] | None = None, task: bool | TaskConfig | None = None, auth: AuthCheck | list[AuthCheck] | None = None) -> FunctionResourceTemplate
```

Create a template from a function.