Definition
A tool call is when an AI model asks an external tool to run with specific inputs, such as fetching search terms for the last 30 days, and then uses the result in its answer.
Also called function call
MegaMCP glossary32 terms
Explained
The model chooses the tool from the descriptions an MCP server provides, fills in the inputs, and the AI app sends the request. Most apps show each call and ask for permission, at least the first time.
In MegaMCP, read tool calls return data immediately; write tool calls return a plan that a person has to approve before anything changes. Every call is recorded in the flight recorder.
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