Module protocol 

Available on crate feature mcp only.

JSON-RPC 2.0 + MCP protocol types (issue #420).

A minimal, hand-rolled subset of the Model Context Protocol — enough to serve initialize, tools/list, tools/call, resources/list, resources/read, and ping over any byte transport. Kept dependency-free (just serde_json) so the mcp feature adds no new crate tree.

Structs

JsonRpcRequest

An incoming JSON-RPC request or notification.

ToolDef

A tool definition advertised via tools/list.

Constants

INTERNAL_ERROR

INVALID_PARAMS

INVALID_REQUEST

METHOD_NOT_FOUND

PARSE_ERROR

JSON-RPC 2.0 standard error codes.

PROTOCOL_VERSION

MCP protocol version this server implements/advertises.

Functions

error

Build an error response envelope for id.

error_no_id

An error whose id is unknown (e.g. an unparseable request): JSON-RPC requires id: null in that case.

success

Build a success response envelope for id with result.

tool_error

Wrap a tool error in the MCP tools/call content shape (isError: true).

tool_text

Wrap a tool’s textual result in the MCP tools/call content shape.