create_pattern_branch · Strudel MCP: Risk & Policy

WHAT IT DOES

What create_pattern_branch does on Strudel

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

WHY IT NEEDS A POLICY

Why create_pattern_branch needs a policy

This tool creates (writes) new data—a pattern branch—but does not delete, overwrite irreversibly, execute arbitrary code, move financial assets, or trigger external operations with unpredictable side effects. The operation is reversible; a created branch can be deleted.

From the tool's definition Tool name 'create_pattern_branch' and description 'Create a branch from an existing pattern' indicate creation of a new resource derived from existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_pattern_branch Rate-limited

create_pattern_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": {
    "create_pattern_branch": {
      "limits": [
        {
          "counter": "create_pattern_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 Strudel, so you can run agents against it safely.

FAQ

Questions about create_pattern_branch

What does the create_pattern_branch tool do? +

Create a branch from an existing pattern. It is categorised as a Write tool in the Strudel 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_pattern_branch? +

Register the Strudel MCP server in PolicyLayer and add a rule for create_pattern_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 Strudel. Nothing to install.

What risk level is create_pattern_branch? +

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

Can I rate-limit create_pattern_branch? +

Yes. Add a rate_limit block to the create_pattern_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 create_pattern_branch completely? +

Set action: deny in the PolicyLayer policy for create_pattern_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 create_pattern_branch? +

create_pattern_branch is provided by the Strudel MCP server (utenadev/strudel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.