pf_block_user

Block an account system-wide (the authenticated user no longer sees their posts). Rate-limited: 5/hour.

SERVERCrow SOURCEkh0pper/crow

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/kh0pper-crow/pf-block-user.md

WHAT IT DOES

What pf_block_user does on Crow

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

RISK

Why pf_block_user is rated Medium

Blocking a user is a reversible write action — it modifies a relationship/visibility state but can typically be undone by unblocking. It does not permanently delete data. Severity is medium because misuse could silently hide content from the user or be used to harass/isolate accounts, but the blast radius is limited and the action is reversible.

From the tool's definition Block an account system-wide (the authenticated user no longer sees their posts)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pf_block_user safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Crow, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pf_block_user, this is the rule to start with:

pf_block_user Rate-limited

pf_block_user 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": {
    "pf_block_user": {
      "limits": [
        {
          "counter": "pf_block_user_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Crow, apply this rule, and every pf_block_user call is checked against it from then on.

FAQ

Questions about pf_block_user

What does the pf_block_user tool do? +

Block an account system-wide (the authenticated user no longer sees their posts). Rate-limited: 5/hour. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pf_block_user? +

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

What risk level is pf_block_user? +

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

Can I rate-limit pf_block_user? +

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

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

pf_block_user is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →