plugin_create

SERVER0nmcp SOURCE0nmcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-0nork-0nmcp/plugin-create.md

WHAT IT DOES

What plugin_create does on 0nmcp

AI agents use plugin_create to create or update resources in 0nmcp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your 0nmcp environment.

RISK

Why plugin_create is rated Medium

The tool creates new plugin specification files and persists them to disk in a system directory (~/.0n/plugins/). This is a reversible write operation (files can be deleted or edited later), not destructive. However, it modifies system configuration in a way that affects runtime behavior of the orchestrator, and an AI agent could create malicious or buggy plugins that impact system stability or security.

From the tool's definition Tool description states it "Generate[s] a new custom plugin spec" and "Saves to ~/.0n/plugins/" — these are create and write operations that modify the filesystem and configuration.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs plugin_create safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 0nmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For plugin_create, this is the rule to start with:

plugin_create Rate-limited

plugin_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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect 0nmcp, apply this rule, and every plugin_create call is checked against it from then on.

FAQ

Questions about plugin_create

What does the plugin_create tool do? +

Generate a new custom plugin spec for a service not in the catalog. Auto-infers capabilities from endpoints and maps .0n canonical fields. Saves to ~/.0n/plugins/ for automatic loading. Example: plugin_create({ key:. It is categorised as a Write tool in the 0nmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on plugin_create? +

Register the 0n MCP server in PolicyLayer and add a rule for plugin_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 0nmcp. Nothing to install.

What risk level is plugin_create? +

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

Can I rate-limit plugin_create? +

Yes. Add a rate_limit block to the plugin_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.

How do I block plugin_create completely? +

Set action: deny in the PolicyLayer policy for plugin_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.

What MCP server provides plugin_create? +

plugin_create is provided by the 0n MCP server (0nmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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