create_space · Ai Brain MCP: Risk & Policy

WHAT IT DOES

What create_space does on Ai Brain

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

WHY IT NEEDS A POLICY

Why create_space needs a policy

This tool creates a new workspace resource in the knowledge base, which is a reversible write operation. It modifies the system state by adding a new entity but does not delete, execute code, or move money.

From the tool's definition The tool name is 'create_space' and the description states it will 'Create a new space (workspace)' and 'Returns the new space including its id'. This is a CREATE operation that adds new data to the knowledge base.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_space Rate-limited

create_space 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_space": {
      "limits": [
        {
          "counter": "create_space_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 Ai Brain, so you can run agents against it safely.

FAQ

Questions about create_space

What does the create_space tool do? +

Create a new space (workspace) owned by the user. Returns the new space including its id, which you can pass to create_document and other tools. It is categorised as a Write tool in the Ai Brain 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_space? +

Register the Ai Brain MCP server in PolicyLayer and add a rule for create_space: 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 Ai Brain. Nothing to install.

What risk level is create_space? +

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

Can I rate-limit create_space? +

Yes. Add a rate_limit block to the create_space 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_space completely? +

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

create_space is provided by the Ai Brain MCP server (thejoshgriffith/ai-brain). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.