Stat: path, size, modified, mime type, owner uid, is_file/is_dir.
AI agents call file_info to retrieve information from Nexus Core without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
file_info retrieves and queries file metadata without modifying, creating, deleting, or executing anything. It is a pure read operation analogous to Unix 'stat' or 'ls' commands used for inspection only.
From the tool's definition Tool description states it performs 'Stat' operations retrieving file metadata (path, size, modified, mime type, owner uid, is_file/is_dir). These are read-only filesystem queries with no side effects.
Attacks that exploit this kind of access
Stat: path, size, modified, mime type, owner uid, is_file/is_dir. It is categorised as a Read tool in the Nexus Core MCP Server, which means it retrieves data without modifying state.
Register the Nexus Core MCP server in PolicyLayer and add a rule for file_info: 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 Nexus Core. Nothing to install.
file_info 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 file_info 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 file_info. 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.
file_info is provided by the Nexus Core MCP server (noumenon-ai/nexus-core). 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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