docker_pull_image · Cargoshipper MCP: Risk & Policy

WHAT IT DOES

What docker_pull_image does on Cargoshipper

AI agents invoke docker_pull_image to trigger actions in Cargoshipper. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why docker_pull_image needs a policy

Pulling a Docker image is not purely a read operation; it executes a network fetch and writes image layers to the local Docker daemon. It could be misused to pull malicious images, but it does not directly delete data or move money, making Execute the best fit with medium severity.

From the tool's definition 'Pull a Docker image' — downloading and installing a Docker image triggers an external network operation and modifies local Docker state (image cache)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

docker_pull_image Rate-limited

docker_pull_image 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Cargoshipper, so you can run agents against it safely.

FAQ

Questions about docker_pull_image

What does the docker_pull_image tool do? +

Pull a Docker image. It is categorised as a Execute tool in the Cargoshipper MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on docker_pull_image? +

Register the Cargoshipper MCP server in PolicyLayer and add a rule for docker_pull_image: 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 Cargoshipper. Nothing to install.

What risk level is docker_pull_image? +

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

Can I rate-limit docker_pull_image? +

Yes. Add a rate_limit block to the docker_pull_image 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 docker_pull_image completely? +

Set action: deny in the PolicyLayer policy for docker_pull_image. 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 docker_pull_image? +

docker_pull_image is provided by the Cargoshipper MCP server (scarr7981/cargoshipper-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.