AI agents call extract_file to retrieve information from Trace MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The extract_file tool performs static analysis to read and parse schema information from source files. It does not execute code, modify data, delete anything, or perform financial operations. The action is purely informational: extracting metadata about API contracts for comparison and validation purposes. This fits the Read category (retrieves or queries data; no side effects).
From the tool's definition Tool description states 'Extract API schemas from a single file' — this is a retrieval/analysis operation with no side effects. It parses static schema definitions from code or config files without modifying them.
Attacks that exploit this kind of access
Extract API schemas from a single file. Supports TypeScript, Python, Go, Protobuf, GraphQL SDL, OpenAPI JSON/YAML, and SQL DDL. It is categorised as a Read tool in the Trace MCP MCP Server, which means it retrieves data without modifying state.
Register the Trace MCP server in PolicyLayer and add a rule for extract_file: 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 Trace MCP. Nothing to install.
extract_file 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 extract_file 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 extract_file. 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.
extract_file is provided by the Trace MCP server (mnehmos/mnehmos.trace.mcp). 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.
Teams ship this data inside their own products. See what a licence covers →