AI agents call review_code to retrieve information from CodexMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs static assessment/analysis of code. It reads and evaluates code but does not modify files, execute code, or produce external side effects. Similar to a linter or code review tool, it produces a report or feedback without changing anything. Severity is low because misuse at worst produces misleading analysis output.
From the tool's definition "Assess code quality, security, style or other aspects" — read-only analysis with no described side effects
Documented attack patterns abuse exactly the kind of access review_code gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CodexMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for review_code:
{
"version": "1",
"default": "deny",
"tools": {
"review_code": {}
}
}review_code is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Assess code quality, security, style or other aspects. It is categorised as a Read tool in the CodexMCP MCP Server, which means it retrieves data without modifying state.
Register the Codex MCP server in PolicyLayer and add a rule for review_code: 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 CodexMCP. Nothing to install.
review_code 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_code 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_code. 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_code is provided by the Codex MCP server (tomascupr/codexmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 CodexMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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3 CodexMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.