bbs_log_start · Mcp Bbs MCP: Risk & Policy

WHAT IT DOES

What bbs_log_start does on Mcp Bbs

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

WHY IT NEEDS A POLICY

Why bbs_log_start needs a policy

This tool writes log data to a JSONL file on the filesystem. It creates/modifies a file but is reversible (file can be deleted). No code execution, financial operations, or destructive actions are implied. Severity is low as logging is a benign write operation with minimal blast radius.

From the tool's definition Start logging session activity to a JSONL file

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bbs_log_start Rate-limited

bbs_log_start 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": {
    "bbs_log_start": {
      "limits": [
        {
          "counter": "bbs_log_start_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 Mcp Bbs, so you can run agents against it safely.

FAQ

Questions about bbs_log_start

What does the bbs_log_start tool do? +

Start logging session activity to a JSONL file. It is categorised as a Write tool in the Mcp Bbs MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on bbs_log_start? +

Register the Mcp Bbs MCP server in PolicyLayer and add a rule for bbs_log_start: 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 Mcp Bbs. Nothing to install.

What risk level is bbs_log_start? +

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

Can I rate-limit bbs_log_start? +

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

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

bbs_log_start is provided by the Mcp Bbs MCP server (livingstaccato/mcp-bbs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.