AI agents use createDraftPullRequest to create or update resources in Bitbucket MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Bitbucket MCP environment.
This tool creates a new pull request (in draft state), which is a reversible write operation. While pull requests are important artifacts in a repository, they can be deleted or converted to draft status. The blast radius is medium because an agent could create many unnecessary pull requests cluttering the workflow, but this doesn't cause irreversible data loss or code execution.
From the tool's definition Tool name is 'createDraftPullRequest' and description states 'Create a new draft pull request'. The verb 'Create' and action of creating a new pull request resource indicates data creation.
Documented attack patterns abuse exactly the kind of access createDraftPullRequest gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Bitbucket MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for createDraftPullRequest:
{
"version": "1",
"default": "deny",
"tools": {
"createDraftPullRequest": {
"limits": [
{
"counter": "createdraftpullrequest_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}createDraftPullRequest 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.
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Create a new draft pull request. It is categorised as a Write tool in the Bitbucket MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Bitbucket MCP server in PolicyLayer and add a rule for createDraftPullRequest: 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 MCP. Nothing to install.
createDraftPullRequest is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the createDraftPullRequest 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.
Set action: deny in the PolicyLayer policy for createDraftPullRequest. 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.
createDraftPullRequest is provided by the Bitbucket MCP server (matanyemini/bitbucket-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Bitbucket MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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49 Bitbucket MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.