schedule_post

THE RISK

Medium Risk

Why schedule_post needs a policy

This tool creates new data (a scheduled post) reversibly. While the post will be published automatically, scheduling is a Write operation: the action is reversible before publication (the scheduled post can be cancelled/deleted), and it doesn't execute arbitrary code or delete data.

From the tool's definition Tool description states 'Schedule a new post for future publishing' — this creates new content on Facebook that will be published, modifying the Page's content feed.

Documented attack patterns abuse exactly the kind of access schedule_post gives an agent:

POLICY

How to control schedule_post

PolicyLayer is an MCP gateway — it sits between your AI agents and Just Facebook MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for schedule_post:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "schedule_post": {
      "limits": [
        {
          "counter": "schedule_post_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

schedule_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.

Create a free account and register Just Facebook MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Just Facebook MCP Server tools

Destructive delete_comment Delete a specific comment from the Page. Destructive delete_comment_from_post Alias to delete a comment on a post. Destructive delete_post Delete a specific post from the Facebook Page. Write post_image_to_facebook Post an image with a caption to the Facebook page. Write post_to_facebook Create a new Facebook Page post with a text message. Write reply_to_comment Reply to a specific comment on a Facebook post. Write send_dm_to_user Send a direct message to a user. Write update_post Updates an existing post's message.

All 30 Just Facebook MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about schedule_post

What does the schedule_post tool do? +

Schedule a new post for future publishing. It is categorised as a Write tool in the Just Facebook MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on schedule_post? +

Register the Just Facebook MCP Server MCP server in PolicyLayer and add a rule for schedule_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 Just Facebook MCP Server. Nothing to install.

What risk level is schedule_post? +

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

Can I rate-limit schedule_post? +

Yes. Add a rate_limit block to the schedule_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 schedule_post completely? +

Set action: deny in the PolicyLayer policy for schedule_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 schedule_post? +

schedule_post is provided by the Just Facebook MCP Server MCP server (livia-zaharia/just_facebook_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Just Facebook MCP Server tool call.

Start from Just Facebook MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →