docker_registry · Docker MCP Server MCP: Risk & Policy

WHAT IT DOES

What docker_registry does on Docker MCP Server

AI agents invoke docker_registry to trigger actions in Docker MCP Server. 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_registry needs a policy

This tool performs multiple operations of varying severity: pulling images from a registry (Read/Execute), pushing images to a registry (Write), and login/logout to Docker Hub (Execute with credential handling). Push operations can overwrite existing registry images and login exposes credentials to the agent. Per the most-severe-applicable rule, the push operation and credential management make this Execute.

From the tool's definition Search Docker Hub, login/logout, push/pull operations

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

docker_registry Rate-limited

docker_registry 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_registry": {
      "limits": [
        {
          "counter": "docker_registry_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 Docker MCP Server, so you can run agents against it safely.

FAQ

Questions about docker_registry

What does the docker_registry tool do? +

Search Docker Hub, login/logout, push/pull operations. It is categorised as a Execute tool in the Docker MCP Server 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_registry? +

Register the Docker MCP Server MCP server in PolicyLayer and add a rule for docker_registry: 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 Docker MCP Server. Nothing to install.

What risk level is docker_registry? +

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

Can I rate-limit docker_registry? +

Yes. Add a rate_limit block to the docker_registry 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_registry completely? +

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

docker_registry is provided by the Docker MCP Server MCP server (tauqeerahmad5201/docker-mcp-extension). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.