bbs_learn_state · Mcp Bbs MCP: Risk & Policy

WHAT IT DOES

What bbs_learn_state does on Mcp Bbs

AI agents use bbs_learn_state 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_learn_state needs a policy

This tool writes/appends data to a shared file (state-model.md). It creates or modifies data in a reversible manner (appending to a file), placing it in the Write category. Severity is medium because it modifies a shared state file that could affect other tools' behavior or the AI agent's understanding of the BBS system state.

From the tool's definition Append a state entry to shared state-model.md

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bbs_learn_state Rate-limited

bbs_learn_state 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_learn_state": {
      "limits": [
        {
          "counter": "bbs_learn_state_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_learn_state

What does the bbs_learn_state tool do? +

Append a state entry to shared state-model.md. 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_learn_state? +

Register the Mcp Bbs MCP server in PolicyLayer and add a rule for bbs_learn_state: 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_learn_state? +

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

Can I rate-limit bbs_learn_state? +

Yes. Add a rate_limit block to the bbs_learn_state 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_learn_state completely? +

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

bbs_learn_state 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.