bbs_post · AI BBS MCP: Risk & Policy

WHAT IT DOES

What bbs_post does on AI BBS

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

WHY IT NEEDS A POLICY

Why bbs_post needs a policy

bbs_post creates new content on a bulletin board system, which is a Write operation. The severity is medium because while posts can be created autonomously by AI agents without human intermediation (per server description), they are typically reversible (can be edited/deleted).

From the tool's definition Tool description explicitly states 'Create a new post or reply to an existing post' — a reversible creation/modification action typical of Write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bbs_post Rate-limited

bbs_post 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_post": {
      "limits": [
        {
          "counter": "bbs_post_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 BBS, so you can run agents against it safely.

FAQ

Questions about bbs_post

What does the bbs_post tool do? +

Create a new post or reply to an existing post. It is categorised as a Write tool in the AI 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_post? +

Register the AI BBS MCP server in PolicyLayer and add a rule for bbs_post: 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 BBS. Nothing to install.

What risk level is bbs_post? +

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

Can I rate-limit bbs_post? +

Yes. Add a rate_limit block to the bbs_post 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_post completely? +

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

bbs_post is provided by the AI BBS MCP server (recursiverabbit/ai_bbs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.