Create a pull request on GitHub
AI agents use fleet_git_pr_create to create or update resources in Fleet — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fleet environment.
This tool creates new data (a GitHub pull request) that is reversible but persistent. It does not execute arbitrary code, delete data, or move money, placing it in the Write category. Severity is high because a malicious or confused agent could create unwanted PRs that trigger CI/CD pipelines, notifications, and deployment workflows in production, or inject malicious code into review processes.
From the tool's definition Tool creates a pull request on GitHub, which creates a new record in version control with persistent side effects. The description explicitly states 'Create a pull request', indicating a write operation that modifies GitHub's state by creating a new PR.
Documented attack patterns abuse exactly the kind of access fleet_git_pr_create gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fleet, and nothing reaches the server without passing your rules. This is the rule we recommend for fleet_git_pr_create:
{
"version": "1",
"default": "deny",
"tools": {
"fleet_git_pr_create": {
"limits": [
{
"counter": "fleet_git_pr_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}fleet_git_pr_create 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 pull request on GitHub. It is categorised as a Write tool in the Fleet MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fleet MCP server in PolicyLayer and add a rule for fleet_git_pr_create: 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 Fleet. Nothing to install.
fleet_git_pr_create 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 fleet_git_pr_create 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 fleet_git_pr_create. 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.
fleet_git_pr_create is provided by the Fleet MCP server (wrxck/fleet). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fleet, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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39 Fleet tools catalogued and risk-classified — across an index of 43,000+ MCP servers.