post_facebook · Social MCP: Risk & Policy

WHAT IT DOES

What post_facebook does on Social

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

WHY IT NEEDS A POLICY

Why post_facebook needs a policy

This tool creates new data (a Facebook post) that is reversible (posts can be edited or deleted by the user). It modifies the user's social media presence but does not execute arbitrary code, delete data irreversibly, or involve financial transactions.

From the tool's definition Tool description states it 'Post a text message to your personal Facebook wall', which creates new content on the platform.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

post_facebook Rate-limited

post_facebook 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": {
    "post_facebook": {
      "limits": [
        {
          "counter": "post_facebook_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 Social, so you can run agents against it safely.

FAQ

Questions about post_facebook

What does the post_facebook tool do? +

Post a text message to your personal Facebook wall. It is categorised as a Write tool in the Social MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on post_facebook? +

Register the Social MCP server in PolicyLayer and add a rule for post_facebook: 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 Social. Nothing to install.

What risk level is post_facebook? +

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

Can I rate-limit post_facebook? +

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

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

post_facebook is provided by the Social MCP server (whypuss/ai-cdp-browser). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.