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What cat does on Claude C2
AI agents call cat to retrieve information from Claude C2 without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why cat is rated Low
This tool retrieves and displays file contents without modifying, deleting, or executing anything. It has no side effects beyond querying data, fitting the 'Read' category. Severity is low as file reading alone presents minimal risk unless the system contains highly sensitive data, but the tool itself is non-destructive. The description is clear and directly indicates its purpose.
From the tool's definition Tool name is 'cat' with description 'Read file contents. Auto-selects client.' The verb 'Read' and lack of modification/deletion/execution semantics clearly indicate a read-only data retrieval operation.
Attacks that exploit this kind of access
The rule that runs cat safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Claude C2, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For cat, this is the rule to start with:
cat is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Claude C2, apply this rule, and every cat call is checked against it from then on.
Questions about cat
Read file contents. Auto-selects client. It is categorised as a Read tool in the Claude C2 MCP Server, which means it retrieves data without modifying state.
Register the Claude C2 MCP server in PolicyLayer and add a rule for cat: 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 Claude C2. Nothing to install.
cat 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 cat 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 cat. 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.
cat is provided by the Claude C2 MCP server (0xyg3n/claude-c2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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