brain_add · Claude Team MCP: Risk & Policy

WHAT IT DOES

What brain_add does on Claude Team MCP

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

WHY IT NEEDS A POLICY

Why brain_add needs a policy

The 'brain_add' tool appears to create or modify data in a shared team memory system (the 'brain'). This is a Write operation because it creates or modifies data reversibly. Severity is medium because misuse could pollute shared team knowledge, affecting multiple agents' decision-making, but the data can presumably be corrected or removed.

From the tool's definition Tool name 'brain_add' suggests adding or storing data to a shared knowledge base or memory system. The description is empty, which limits certainty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

brain_add Rate-limited

brain_add 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": {
    "brain_add": {
      "limits": [
        {
          "counter": "brain_add_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 Claude Team MCP, so you can run agents against it safely.

FAQ

Questions about brain_add

What does the brain_add tool do? +

brain_add. It is categorised as a Write tool in the Claude Team MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on brain_add? +

Register the Claude Team MCP server in PolicyLayer and add a rule for brain_add: 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 Claude Team MCP. Nothing to install.

What risk level is brain_add? +

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

Can I rate-limit brain_add? +

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

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

brain_add is provided by the Claude Team MCP server (lakshan12367/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.