pr-merge

THE RISK

Medium Risk

Why pr-merge needs a policy

Merging a pull request combines code branches and can trigger CI/CD pipelines, deployments, and other downstream effects. While technically reversible (a revert commit can undo it), the merge itself modifies the repository's main branch history. The mention of 'branch deletion status' suggests it may also delete branches as part of the operation.

From the tool's definition Merges a pull request by number, URL, or branch. Returns structured data with merge status, method, URL, and branch deletion status.

Documented attack patterns abuse exactly the kind of access pr-merge gives an agent:

POLICY

How to control pr-merge

PolicyLayer is an MCP gateway — it sits between your AI agents and Make, and nothing reaches the server without passing your rules. This is the rule we recommend for pr-merge:

policy.json

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

pr-merge 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.

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

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Make tools

Destructive clean Runs dotnet clean to remove build outputs and returns structured results. Destructive remove Runs Destructive reset Resets the current HEAD to a specified state. Supports soft, mixed, hard, merge, and keep Destructive secret-delete Deletes a repository, organization, or environment GitHub Actions secret. Destructive tag Manages git tags. Supports list (default), create, and delete actions. List returns struct Destructive vagrant Manages Vagrant VMs: status, global-status, up, halt, destroy. Destructive variable-delete Deletes a repository, organization, or environment GitHub Actions variable. Destructive workspace Manages Terraform workspaces: list, select, create, or delete workspaces.

All 202 Make tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about pr-merge

What does the pr-merge tool do? +

Merges a pull request by number, URL, or branch. Returns structured data with merge status, method, URL, and branch deletion status. It is categorised as a Write tool in the Make 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-merge? +

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

What risk level is pr-merge? +

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

Can I rate-limit pr-merge? +

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

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

pr-merge is provided by the Make MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Make tool call.

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

CHECK YOUR STACK →