Tool Schema
A tool schema is the structured definition of a tool's name, description, input parameters, and types exposed via MCP, used by agents to understand how to invoke the tool correctly.
Why this matters for AI agents
Tool schemas define what an agent can send to a tool. Parameter-level policy based on schemas enables fine-grained control, such as allowing read but not write, or restricting certain resource identifiers.
How AgntID relates
AgntID uses tool schemas to enable parameter-level policy enforcement—access decisions can be made based on specific input values, not just whether the tool may be called.
The static IAM gap
Static IAM does not inspect tool schemas or parameter values. A permission grants full access to a tool regardless of the parameters the agent passes.
Related phrases
Frequently asked questions
What is a tool schema in MCP?
A tool schema is the structured definition of a tool's name, description, input parameters, and types exposed via MCP, used by agents to understand how to invoke the tool correctly.
How does AgntID use tool schemas for enforcement?
AgntID uses tool schemas to enable parameter-level policy enforcement, allowing access decisions to be made based on specific input values—not just whether the tool may be called.
What example of parameter-level enforcement does tool schema enable?
Tool schemas enable rules like 'allow read but not write' or 'restrict calls to resource IDs the agent owns'—enforcement that is impossible without inspecting the schema and parameters.
Secure every agent tool call at execution time.
AgntID gives infrastructure teams scoped, ephemeral access control for AI agents without replacing IAM, MCP servers, tools, or agent frameworks.