get_endpoint_schema

THE RISK

Low Risk

Why get_endpoint_schema needs a policy

This tool retrieves and returns metadata about an endpoint's schema—a read-only operation with no side effects. There is no creation, modification, deletion, code execution, or financial impact. The blast radius of misuse is minimal, as schema queries cannot harm systems or data.

From the tool's definition Tool name 'get_endpoint_schema' and description 'Get the schema of the given endpoint' indicate a retrieval operation. The parenthetical '(Json schema format)' confirms it returns data without modification.

Documented attack patterns abuse exactly the kind of access get_endpoint_schema gives an agent:

POLICY

How to control get_endpoint_schema

PolicyLayer is an MCP gateway — it sits between your AI agents and TypeSpec MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_endpoint_schema:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_endpoint_schema": {}
  }
}

get_endpoint_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register TypeSpec MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about get_endpoint_schema

What does the get_endpoint_schema tool do? +

Get the schema of the given endpoint. (Json schema format)\nUse the. It is categorised as a Read tool in the TypeSpec MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_endpoint_schema? +

Register the TypeSpec MCP Server MCP server in PolicyLayer and add a rule for get_endpoint_schema: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches TypeSpec MCP Server. Nothing to install.

What risk level is get_endpoint_schema? +

get_endpoint_schema is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_endpoint_schema? +

Yes. Add a rate_limit block to the get_endpoint_schema rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block get_endpoint_schema completely? +

Set action: deny in the PolicyLayer policy for get_endpoint_schema. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides get_endpoint_schema? +

get_endpoint_schema is provided by the TypeSpec MCP Server MCP server (microsoft/typespec-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every TypeSpec MCP Server tool call.

Start from TypeSpec MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →