An invocation of a tool on an MCP server.
A JSON string of the arguments passed to the tool.
Optional
The error from the tool call, if any.
The unique ID of the tool call.
The name of the tool that was run.
The output from the tool call.
The label of the MCP server running the tool.
The type of the item. Always mcp_call.
mcp_call
An invocation of a tool on an MCP server.