Tool Call
A tool call is a model's structured request to run exactly one named function with validated arguments. Execution happens outside the model.
The model does not run code. It emits a call such as check_ssl with {"host": "deinkunde.com"}, the client passes it to the MCP server, and the result comes back into context as a tool result. Only then does the model read the certificate data. That split is the whole point: reasoning stays probabilistic, execution stays deterministic and auditable. Every call can be logged, rate limited or refused before it touches a production system.
Related terms
Model Context Protocol (MCP)The Model Context Protocol (MCP) is an open standard for connecting AI applications to external tools and data through one shared interface instead of one custom integration per system.MCP ServerAn MCP server is the far side of the Model Context Protocol: the program that offers an AI client a defined set of tools, resources and prompts.API Token (Bearer Token)An API token is a secret credential that authenticates programmatic requests to an API, sent as a bearer token in the Authorization header.
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