create_collection · Krill To MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_collection does on Krill To MCP Server

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

WHY IT NEEDS A POLICY

Why create_collection needs a policy

This tool creates new data (a collection) but the action is reversible—collections can be deleted or modified later. It does not delete, execute code, move money, or access sensitive information beyond what the user already controls. The blast radius is moderate: an AI agent could create many unwanted collections cluttering the user's workspace, but this is not destructive or irreversible in the strongest sense.

From the tool's definition The tool 'create_collection' creates a new bookmark collection, which is a reversible modification of user data stored on krill.to/Twitter-X. The description explicitly states 'Create a new bookmark collection.'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_collection Rate-limited

create_collection 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_collection": {
      "limits": [
        {
          "counter": "create_collection_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 Krill To MCP Server, so you can run agents against it safely.

FAQ

Questions about create_collection

What does the create_collection tool do? +

Create a new bookmark collection. It is categorised as a Write tool in the Krill To 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 create_collection? +

Register the Krill To MCP Server MCP server in PolicyLayer and add a rule for create_collection: 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 Krill To MCP Server. Nothing to install.

What risk level is create_collection? +

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

Can I rate-limit create_collection? +

Yes. Add a rate_limit block to the create_collection 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_collection completely? +

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

create_collection is provided by the Krill To MCP Server MCP server (krillto/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.