MCP Academy · Lesson

Invoke Tools from Code

Call a server tool and read its result.

From Listing to Doing

Discovery told you what exists. Now you actually invoke a tool, sending arguments and reading back the result from your own code.

Use session.call_tool() with the tool name and a dictionary of arguments. The names must match the inputSchema you discovered.

result = await session.call_tool(
    "add",
    {"a": 2, "b": 3},
)