filter_negative_comments

THE RISK

Low Risk

Why filter_negative_comments needs a policy

This tool reads comment data and performs sentiment analysis filtering—a non-destructive query operation. It does not create, modify, delete, or execute external code. While the server contains destructive tools (delete_comment, delete_post), this specific tool only examines and categorizes existing data.

From the tool's definition Tool name 'filter_negative_comments' and description 'Filter comments for basic negative sentiment' indicate the tool retrieves and analyzes existing comment data without modifying, deleting, or executing external operations.

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

POLICY

How to control filter_negative_comments

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 filter_negative_comments:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "filter_negative_comments": {}
  }
}

filter_negative_comments is read-only, so it stays allowed — but 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.

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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 schedule_post Schedule a new post for future publishing. Write send_dm_to_user Send a direct message to a user.

All 30 Just Facebook MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about filter_negative_comments

What does the filter_negative_comments tool do? +

Filter comments for basic negative sentiment. It is categorised as a Read tool in the Just Facebook MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on filter_negative_comments? +

Register the Just Facebook MCP Server MCP server in PolicyLayer and add a rule for filter_negative_comments: 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 filter_negative_comments? +

filter_negative_comments is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit filter_negative_comments? +

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

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

filter_negative_comments 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 →