Request a code review of a specific file from Codex and Gemini CLIs. Returns feedback from both reviewers for Claude to consider.
AI agents call review_file to retrieve information from Review MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation: it retrieves code review feedback from external services without modifying source code, executing arbitrary commands, or causing side effects. The reviewing services may analyze code, but the tool itself merely queries and returns their feedback to Claude for consideration.
From the tool's definition Tool 'review_file' requests and returns code review feedback from external CLIs (Codex and Gemini). The description explicitly states it 'returns feedback' with no mention of modifying, deleting, or executing code.
Attacks that exploit this kind of access
Request a code review of a specific file from Codex and Gemini CLIs. Returns feedback from both reviewers for Claude to consider. It is categorised as a Read tool in the Review MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Review MCP Server MCP server in PolicyLayer and add a rule for review_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 Review MCP Server. Nothing to install.
review_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 review_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 review_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.
review_file is provided by the Review MCP Server MCP server (je4550/review-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.
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