MCP
MCP Tool
A function exposed by an MCP server that an AI agent can call to perform an action.
In depth
A function exposed by an MCP server that an AI agent can call to perform an action. Tools have a name, description, input schema (defined with Zod or JSON Schema), and a handler function. When an AI model decides to use a tool, the MCP client validates the inputs, calls the server, and returns the result to the model. Tools are the most commonly used MCP capability.
Example
In practice, developers reach for MCP Tool when they need the capability described above as part of an AI feature or workflow.
Go deeper at Developers Digest
Hands-on guides, comparisons, and tutorials that cover MCP.
FAQ
Common questions
What is MCP Tool?
A function exposed by an MCP server that an AI agent can call to perform an action.
Why does MCP Tool matter for AI developers?
MCP Tool sits in the MCP part of the AI stack. Understanding it helps you make better decisions when building, debugging, and shipping AI features.
Where can I learn more about MCP Tool?
Developers Digest publishes tutorials and videos that cover MCP topics including MCP Tool. Check the blog and YouTube channel for hands-on walkthroughs.
Related
Related terms
MCP
MCP Tool Poisoning
MCP tool poisoning is an attack where a malicious MCP server hides instructions in a tool's description, which the model reads but the user usually never sees.
MCP
MCP Authorization (OAuth 2.1)
MCP authorization is the part of the Model Context Protocol spec that defines how a client gets permission to call a protected MCP server over an HTTP-based transport.
MCP
MCP Client
An application that connects to MCP servers to use the tools, resources, and prompts they expose.
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