AI agents call which_command to retrieve information from Allcanuse without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The Unix/Windows 'which' command locates executables in PATH and returns their location. It is a read-only lookup operation with no side effects. Confidence is reduced due to the empty description, but the well-known semantics of 'which' strongly suggest a read operation.
From the tool's definition Tool name 'which_command' — description is empty/uninformative
Documented attack patterns abuse exactly the kind of access which_command gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Allcanuse, and nothing reaches the server without passing your rules. This is the rule we recommend for which_command:
{
"version": "1",
"default": "deny",
"tools": {
"which_command": {}
}
}which_command is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
which_command. It is categorised as a Read tool in the Allcanuse MCP Server, which means it retrieves data without modifying state.
Register the Allcanuse MCP server in PolicyLayer and add a rule for which_command: 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 Allcanuse. Nothing to install.
which_command 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 which_command 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 which_command. 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.
which_command is provided by the Allcanuse MCP server (ra1nyxin/allcanuse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Allcanuse, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
130 Allcanuse tools catalogued and risk-classified — across an index of 43,000+ MCP servers.