fw_follow

Follow a library (by UUID) or a remote channel (by actor URL/handle @user@server). Rate-limited: 30/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/fw-follow.md

WHAT IT DOES

What fw_follow does on Crow

AI agents use fw_follow 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 fw_follow is rated Medium

Following a library or remote channel creates a new subscription/relationship record. This is a reversible write action (can be unfollowed), not destructive or financial. Misuse could spam follow requests or establish unwanted federation connections, hence medium severity.

From the tool's definition Follow a library (by UUID) or a remote channel (by actor URL/handle @user@server)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs fw_follow 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 fw_follow, this is the rule to start with:

fw_follow Rate-limited

fw_follow 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": {
    "fw_follow": {
      "limits": [
        {
          "counter": "fw_follow_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 fw_follow call is checked against it from then on.

FAQ

Questions about fw_follow

What does the fw_follow tool do? +

Follow a library (by UUID) or a remote channel (by actor URL/handle @user@server). Rate-limited: 30/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 fw_follow? +

Register the Crow MCP server in PolicyLayer and add a rule for fw_follow: 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 fw_follow? +

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

Can I rate-limit fw_follow? +

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

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

fw_follow 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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This server

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Guides

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