> ## Documentation Index
> Fetch the complete documentation index at: https://fastmcp-docs-v3-beta2-feature-tracking.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# mcp_operations

# `fastmcp.server.mixins.mcp_operations`

MCP protocol handler setup and wire-format handlers for FastMCP Server.

## Classes

### `MCPOperationsMixin` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/mixins/mcp_operations.py#L90" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Mixin providing MCP protocol handler setup and wire-format handlers.

Note: Methods registered with SDK decorators (e.g., \_list\_tools\_mcp, \_call\_tool\_mcp)
cannot use `self: FastMCP` type hints because the SDK's `get_type_hints()` fails
to resolve FastMCP at runtime (it's only available under TYPE\_CHECKING). When
type hints fail to resolve, the SDK falls back to calling handlers with no arguments.
These methods use untyped `self` to avoid this issue.