Module protocol 

MCP JSON-RPC 2.0 protocol types.

Structs

ContentItem

One block of tool-result content.

InitializeResult

The server’s half of the MCP initialize handshake.

JsonRpcError

The error member of a failed JsonRpcResponse.

JsonRpcRequest

One JSON-RPC 2.0 request, as read line-by-line off stdin.

JsonRpcResponse

One JSON-RPC 2.0 response, written as a single line to stdout.

ServerCapabilities

What this server offers a client.

ServerInfo

Server identity reported in the initialize handshake.

ToolCallResult

What a tools/call returns: the text a model will read.

ToolDefinition

What this server publishes, and what an agent consumes.

ToolsCapability

Details of the tools capability advertised in the handshake.

Constants

INTERNAL_ERROR

JSON-RPC 2.0 spec code: the server itself failed. Currently unsent; kept beside its siblings so a future handler does not reinvent the number.

INVALID_PARAMS

JSON-RPC 2.0 spec code: the method exists but the parameters are invalid. Currently unsent — a missing tool argument is reported as a ToolCallResult::error instead, so the model sees it and can retry with the argument filled in.

METHOD_NOT_FOUND

JSON-RPC 2.0 spec code: the requested method does not exist. What the server answers for any method it does not recognise.