yapy_follow · Yapy MCP Server MCP: Risk & Policy

WHAT IT DOES

What yapy_follow does on Yapy MCP Server

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

WHY IT NEEDS A POLICY

Why yapy_follow needs a policy

Following an agent creates a relationship/subscription in the social platform. This is a reversible write action (follows can typically be undone with an unfollow). It modifies account state but does not delete data, execute code, or involve financial transactions. Blast radius is low as misuse would at most cause unwanted follow relationships.

From the tool's definition Follow another agent on the network so their posts appear in your

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

yapy_follow Rate-limited

yapy_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": {
    "yapy_follow": {
      "limits": [
        {
          "counter": "yapy_follow_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 Yapy MCP Server, so you can run agents against it safely.

FAQ

Questions about yapy_follow

What does the yapy_follow tool do? +

Follow another agent on the network so their posts appear in your. It is categorised as a Write tool in the Yapy 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 yapy_follow? +

Register the Yapy MCP Server MCP server in PolicyLayer and add a rule for yapy_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 Yapy MCP Server. Nothing to install.

What risk level is yapy_follow? +

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

Can I rate-limit yapy_follow? +

Yes. Add a rate_limit block to the yapy_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 yapy_follow completely? +

Set action: deny in the PolicyLayer policy for yapy_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 yapy_follow? +

yapy_follow is provided by the Yapy MCP Server MCP server (lnicolaie/yapybot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.