unblock_command

THE RISK

High Risk

Why unblock_command needs a policy

This tool modifies the security policy of the MCP server by removing commands from the blacklist, enabling previously blocked (potentially dangerous) commands to be executed. While it doesn't execute commands itself, it directly enables execution of arbitrary commands by lifting restrictions.

From the tool's definition "Remove a command from the blacklist. Once unblocked, the command can be executed normally."

Documented attack patterns abuse exactly the kind of access unblock_command gives an agent:

POLICY

How to control unblock_command

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude Desktop Commander MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for unblock_command:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unblock_command": {
      "limits": [
        {
          "counter": "unblock_command_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

unblock_command stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Claude Desktop Commander MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Claude Desktop Commander MCP tools

Destructive force_terminate Force terminate a running terminal session. Destructive kill_process Terminate a running process by PID. Use with caution as this will Execute execute_command Execute a terminal command with timeout. Command will continue running in background if it Write block_command Add a command to the blacklist. Once blocked, the command cannot be executed until unblock Write create_directory Create a new directory or ensure a directory exists. Can create multiple Write edit_block Apply surgical text replacements to files. Best for small changes (<20% of file size). Write move_file Move or rename files and directories. Can move files between directories Write write_file Completely replace file contents. Best for large changes (>20% of file) or when edit_block

All 19 Claude Desktop Commander MCP tools →

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Go deeper

High-risk tools in Claude Desktop Commander MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about unblock_command

What does the unblock_command tool do? +

Remove a command from the blacklist. Once unblocked, the command can be executed normally. It is categorised as a Execute tool in the Claude Desktop Commander MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on unblock_command? +

Register the Claude Desktop Commander MCP server in PolicyLayer and add a rule for unblock_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 Claude Desktop Commander MCP. Nothing to install.

What risk level is unblock_command? +

unblock_command is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit unblock_command? +

Yes. Add a rate_limit block to the unblock_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.

How do I block unblock_command completely? +

Set action: deny in the PolicyLayer policy for unblock_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.

What MCP server provides unblock_command? +

unblock_command is provided by the Claude Desktop Commander MCP server (strawhatai/claude-dev-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude Desktop Commander MCP tool call.

Start from Claude Desktop Commander MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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