Read file contents from workspace
AI agents call fs_read_file to retrieve information from AI Code 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 retrieves file contents from a local file system within a defined workspace. It performs a query/fetch operation without creating, modifying, deleting, or executing anything. The read-only nature and bounded scope (workspace) make it low severity even if an agent misuses it, as the blast radius is limited to information disclosure of files already accessible within that workspace.
From the tool's definition Tool name 'fs_read_file' and description 'Read file contents from workspace' explicitly indicate a read-only operation with no modification or side effects.
Attacks that exploit this kind of access
Read file contents from workspace. It is categorised as a Read tool in the AI Code Review MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AI Code Review MCP Server MCP server in PolicyLayer and add a rule for fs_read_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 AI Code Review MCP Server. Nothing to install.
fs_read_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 fs_read_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 fs_read_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.
fs_read_file is provided by the AI Code Review MCP Server MCP server (namph-kozocom/review-code-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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