brain_daily · Claude Team MCP: Risk & Policy

WHAT IT DOES

What brain_daily does on Claude Team MCP

AI agents use brain_daily 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_daily needs a policy

This tool writes (appends) data to a journal entry, which is a reversible, non-destructive write operation. It creates or modifies a daily journal record without executing code, deleting data, or involving financial transactions. Severity is low because the blast radius of misuse is minimal — at worst, incorrect or unwanted text is appended to a journal entry.

From the tool's definition Append to today's daily journal in the second brain

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

brain_daily Rate-limited

brain_daily 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_daily": {
      "limits": [
        {
          "counter": "brain_daily_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_daily

What does the brain_daily tool do? +

Append to today's daily journal in the second brain (or a given date). 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_daily? +

Register the Claude Team MCP server in PolicyLayer and add a rule for brain_daily: 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_daily? +

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

Can I rate-limit brain_daily? +

Yes. Add a rate_limit block to the brain_daily 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_daily completely? +

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

brain_daily 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.