create_branch_restriction · Bitbucket MCP: Risk & Policy

WHAT IT DOES

What create_branch_restriction does on Bitbucket

AI agents use create_branch_restriction 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 create_branch_restriction needs a policy

This tool creates a new branch restriction/protection rule, which is a reversible configuration change that modifies repository settings. It does not execute code, delete data, or move money.

From the tool's definition Tool named 'create_branch_restriction' with description 'Create a branch restriction (protection rule)' — creates a new protection rule that modifies repository access controls.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_branch_restriction Rate-limited

create_branch_restriction 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": {
    "create_branch_restriction": {
      "limits": [
        {
          "counter": "create_branch_restriction_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 create_branch_restriction

What does the create_branch_restriction tool do? +

Create a branch restriction (protection rule). 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 create_branch_restriction? +

Register the Bitbucket MCP server in PolicyLayer and add a rule for create_branch_restriction: 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 create_branch_restriction? +

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

Can I rate-limit create_branch_restriction? +

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

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

create_branch_restriction 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.