unapprove_pr · Bitbucket MCP: Risk & Policy

WHAT IT DOES

What unapprove_pr does on Bitbucket

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

WHY IT NEEDS A POLICY

Why unapprove_pr needs a policy

Unapproving a PR modifies the approval state of a pull request. This is reversible (the PR can be re-approved), making it a Write operation rather than Destructive. Misuse could disrupt code review workflows or unblock/reblock merges, giving it medium severity.

From the tool's definition Remove your approval from a pull request

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unapprove_pr Rate-limited

unapprove_pr 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": {
    "unapprove_pr": {
      "limits": [
        {
          "counter": "unapprove_pr_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about unapprove_pr

What does the unapprove_pr tool do? +

Remove your approval from a pull request. It is categorised as a Write tool in the Bitbucket MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unapprove_pr? +

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

What risk level is unapprove_pr? +

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

Can I rate-limit unapprove_pr? +

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

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

unapprove_pr is provided by the Bitbucket MCP server (javimaligno/mcp-server-bitbucket). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.