Get the OpenAPI schema for the FastAPI application
AI agents call get_openapi_schema to retrieve information from FastAPI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves the OpenAPI schema, which is read-only introspection of the API structure. It has no side effects, does not modify data, execute code with arbitrary effects, delete data, or move money. The operation is purely informational, fitting the 'Read' category. The low severity reflects that schema disclosure is generally low-risk unless the API structure itself is sensitive.
From the tool's definition Tool name 'get_openapi_schema' and description 'Get the OpenAPI schema for the FastAPI application' indicate a retrieval operation that queries and returns existing schema data without modification.
Attacks that exploit this kind of access
Get the OpenAPI schema for the FastAPI application. It is categorised as a Read tool in the FastAPI MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FastAPI MCP Server MCP server in PolicyLayer and add a rule for get_openapi_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 FastAPI MCP Server. Nothing to install.
get_openapi_schema is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_openapi_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.
Set action: deny in the PolicyLayer policy for get_openapi_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.
get_openapi_schema is provided by the FastAPI MCP Server MCP server (nabeelshar/fastapi-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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