bb_create_branch · Bitbucket Cloud MCP Server MCP

WHAT IT DOES

What bb_create_branch does on Bitbucket Cloud MCP Server

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

WHY IT NEEDS A POLICY

Why bb_create_branch needs a policy

Creating a branch is a reversible write operation that modifies repository state by adding a new ref, but does not execute arbitrary code, delete data, or move money. The blast radius is medium because miscreated branches could pollute a repository or be used to bypass access controls, but the operation is non-destructive and can be undone by deleting the branch.

From the tool's definition Tool name 'bb_create_branch' and description 'Create a new branch in a Bitbucket repository' indicate this creates new repository metadata (branch references) that can be modified or deleted later.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bb_create_branch Rate-limited

bb_create_branch 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": {
    "bb_create_branch": {
      "limits": [
        {
          "counter": "bb_create_branch_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 Cloud MCP Server, so you can run agents against it safely.

FAQ

Questions about bb_create_branch

What does the bb_create_branch tool do? +

Create a new branch in a Bitbucket repository. It is categorised as a Write tool in the Bitbucket Cloud MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on bb_create_branch? +

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

What risk level is bb_create_branch? +

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

Can I rate-limit bb_create_branch? +

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

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

bb_create_branch is provided by the Bitbucket Cloud MCP Server MCP server (or2ooo/bitbucket-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.