pr-reopen

Reopens a previously closed pull request, optionally with a comment. Returns structured data with PR number, state, and URL.

SERVERDocker SOURCE@paretools/docker

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-dave-london-docker/pr-reopen.md

WHAT IT DOES

What pr-reopen does on Docker

AI agents use pr-reopen to create or update resources in Docker, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Docker environment.

RISK

Why pr-reopen is rated Medium

This tool modifies the state of an existing pull request by transitioning it from closed to open, which is a reversible write operation. It does not delete data or execute code, and has no financial implications. Misuse could reopen unintended PRs, causing workflow disruption, but the action is reversible.

From the tool's definition Reopens a previously closed pull request, optionally with a comment. Returns structured data with PR number, state, and URL.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pr-reopen safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Docker, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pr-reopen, this is the rule to start with:

pr-reopen Rate-limited

pr-reopen stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pr-reopen": {
      "limits": [
        {
          "counter": "pr-reopen_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Docker, apply this rule, and every pr-reopen call is checked against it from then on.

FAQ

Questions about pr-reopen

What does the pr-reopen tool do? +

Reopens a previously closed pull request, optionally with a comment. Returns structured data with PR number, state, and URL. It is categorised as a Write tool in the Docker MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pr-reopen? +

Register the Docker MCP server in PolicyLayer and add a rule for pr-reopen: 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. Nothing to install.

What risk level is pr-reopen? +

pr-reopen is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pr-reopen? +

Yes. Add a rate_limit block to the pr-reopen 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 pr-reopen completely? +

Set action: deny in the PolicyLayer policy for pr-reopen. 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 pr-reopen? +

pr-reopen is provided by the Docker MCP server (@paretools/docker). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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