bbs_save_prompt_pattern · Mcp Bbs MCP: Risk & Policy

WHAT IT DOES

What bbs_save_prompt_pattern does on Mcp Bbs

AI agents use bbs_save_prompt_pattern 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_save_prompt_pattern needs a policy

The tool creates or modifies data reversibly by appending a prompt pattern to a configuration file. This is a Write operation rather than Read (it changes state) or Destructive (the operation can be undone by removing or editing the file).

From the tool's definition Tool description states it will 'Append a new prompt pattern to the JSON file' — this is a create/modify operation that writes data to persistent storage.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bbs_save_prompt_pattern Rate-limited

bbs_save_prompt_pattern 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_save_prompt_pattern": {
      "limits": [
        {
          "counter": "bbs_save_prompt_pattern_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_save_prompt_pattern

What does the bbs_save_prompt_pattern tool do? +

Append a new prompt pattern to the JSON 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_save_prompt_pattern? +

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

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

Can I rate-limit bbs_save_prompt_pattern? +

Yes. Add a rate_limit block to the bbs_save_prompt_pattern 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_save_prompt_pattern completely? +

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

bbs_save_prompt_pattern 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.