Call
The call verb runs a callable tool by name, whether a built-in tool, an authored lambda, or a tool from an MCP server, and answers a bad call with the tool's contract.

call: run a callable tool by name. The tool can be a built-in (search, query, attributes, web_search, execute), an authored lambda, or a tool from an MCP server (<server>__<tool>). When the input is wrong, call returns the tool's contract instead of an error, so the next try succeeds. This is touch-expand, described in tools. Which tools an agent may call is set by its grants.

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