---
title: inspect
sidebarTitle: inspect
---

# `fastmcp.utilities.inspect`


Utilities for inspecting FastMCP instances.

## Functions

### `inspect_fastmcp_v2` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L100" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
inspect_fastmcp_v2(mcp: FastMCP[Any]) -> FastMCPInfo
```


Extract information from a FastMCP v2.x instance.

**Args:**
- `mcp`: The FastMCP v2.x instance to inspect

**Returns:**
- FastMCPInfo dataclass containing the extracted information


### `inspect_fastmcp_v1` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L236" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo
```


Extract information from a FastMCP v1.x instance using a Client.

**Args:**
- `mcp`: The FastMCP v1.x instance to inspect

**Returns:**
- FastMCPInfo dataclass containing the extracted information


### `inspect_fastmcp` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L378" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
inspect_fastmcp(mcp: FastMCP[Any] | FastMCP1x) -> FastMCPInfo
```


Extract information from a FastMCP instance into a dataclass.

This function automatically detects whether the instance is FastMCP v1.x or v2.x
and uses the appropriate extraction method.

**Args:**
- `mcp`: The FastMCP instance to inspect (v1.x or v2.x)

**Returns:**
- FastMCPInfo dataclass containing the extracted information


### `format_fastmcp_info` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L403" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
format_fastmcp_info(info: FastMCPInfo) -> bytes
```


Format FastMCPInfo as FastMCP-specific JSON.

This includes FastMCP-specific fields like tags, enabled, annotations, etc.


### `format_mcp_info` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L432" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
format_mcp_info(mcp: FastMCP[Any] | FastMCP1x) -> bytes
```


Format server info as standard MCP protocol JSON.

Uses Client to get the standard MCP protocol format with camelCase fields.
Includes version metadata at the top level.


### `format_info` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L465" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
format_info(mcp: FastMCP[Any] | FastMCP1x, format: InspectFormat | Literal['fastmcp', 'mcp'], info: FastMCPInfo | None = None) -> bytes
```


Format server information according to the specified format.

**Args:**
- `mcp`: The FastMCP instance
- `format`: Output format ("fastmcp" or "mcp")
- `info`: Pre-extracted FastMCPInfo (optional, will be extracted if not provided)

**Returns:**
- JSON bytes in the requested format


## Classes

### `ToolInfo` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L19" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Information about a tool.


### `PromptInfo` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L35" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Information about a prompt.


### `ResourceInfo` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L49" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Information about a resource.


### `TemplateInfo` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L65" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Information about a resource template.


### `FastMCPInfo` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L82" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Information extracted from a FastMCP instance.


### `InspectFormat` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/inspect.py#L396" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Output format for inspect command.