Creates a new extension in the specified context (organization or partner).
AI agents use create_extension to create or update resources in Storyblok MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Storyblok MCP Server environment.
This tool creates a new extension, which is a reversible data creation operation. It does not delete, execute arbitrary code, or trigger financial transactions. The moderate severity reflects that extensions could potentially be misconfigured or used to add unwanted functionality to a Storyblok space, but the damage is limited by Storyblok's extension governance and can be undone by deleting the extension.
From the tool's definition Creates a new extension in the specified context (organization or partner) — the word 'Creates' indicates this is a Write operation that generates new data/resources in Storyblok.
Documented attack patterns abuse exactly the kind of access create_extension gives an agent:
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 create_extension:
{
"version": "1",
"default": "deny",
"tools": {
"create_extension": {
"limits": [
{
"counter": "create_extension_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_extension 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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Creates a new extension in the specified context (organization or partner). 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.
Register the Storyblok MCP Server MCP server in PolicyLayer and add a rule for create_extension: 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.
create_extension 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 create_extension 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 create_extension. 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.
create_extension is provided by the Storyblok MCP Server MCP server (kiran1689/storyblok-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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.
Free to start. No card required.
159 Storyblok MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.