copy_stories_between_branches

THE RISK

Medium Risk

Why copy_stories_between_branches needs a policy

The operation modifies state by creating copies of stories in a different branch, which is a Write-class action (reversible data creation). High severity because bulk story copying could affect production branches or create unintended content duplication affecting site integrity. Empty description lowers confidence slightly from 0.85 to 0.8.

From the tool's definition Tool name 'copy_stories_between_branches' indicates it duplicates content across branches. Storyblok is a CMS where stories are content artifacts. Copying creates new content reversibly without deletion.

Documented attack patterns abuse exactly the kind of access copy_stories_between_branches gives an agent:

POLICY

How to control copy_stories_between_branches

PolicyLayer is an MCP gateway — it sits between your AI agents and Storyblok MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for copy_stories_between_branches:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "copy_stories_between_branches": {
      "limits": [
        {
          "counter": "copy_stories_between_branches_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

copy_stories_between_branches 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.

Create a free account and register Storyblok MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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Free to start. No card required.

EXPLORE

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about copy_stories_between_branches

What does the copy_stories_between_branches tool do? +

copy_stories_between_branches. It is categorised as a Write tool in the Storyblok 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 copy_stories_between_branches? +

Register the Storyblok MCP Server MCP server in PolicyLayer and add a rule for copy_stories_between_branches: 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 Storyblok MCP Server. Nothing to install.

What risk level is copy_stories_between_branches? +

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

Can I rate-limit copy_stories_between_branches? +

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

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

copy_stories_between_branches is provided by the Storyblok MCP Server MCP server (arjuncodess/storyblok-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Storyblok MCP Server tool call.

Start from Storyblok MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →