agent_register · Ssyubix A2a Agentlink MCP: Risk & Policy

WHAT IT DOES

What agent_register does on Ssyubix A2a Agentlink

AI agents use agent_register to create or update resources in Ssyubix A2a Agentlink — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ssyubix A2a Agentlink environment.

WHY IT NEEDS A POLICY

Why agent_register needs a policy

Agent registration creates a new agent entry in a cross-device communication system, which is a reversible write operation. The tool does not delete data (not Destructive), does not execute arbitrary code (not Execute), does not move money (not Financial), and does retrieve data (not Read). While registration enables subsequent network communication, the tool itself performs data creation/modification.

From the tool's definition Tool name 'agent_register' and description 'Daftarkan agent ke AgentLink. Wajib dipanggil pertama' (Register agent to AgentLink. Must be called first) indicate registration of an agent, which creates or modifies a record in the AgentLink system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

agent_register Rate-limited

agent_register 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": {
    "agent_register": {
      "limits": [
        {
          "counter": "agent_register_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 Ssyubix A2a Agentlink, so you can run agents against it safely.

FAQ

Questions about agent_register

What does the agent_register tool do? +

Daftarkan agent ke AgentLink. Wajib dipanggil pertama. It is categorised as a Write tool in the Ssyubix A2a Agentlink MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on agent_register? +

Register the Ssyubix A2a Agentlink MCP server in PolicyLayer and add a rule for agent_register: 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 Ssyubix A2a Agentlink. Nothing to install.

What risk level is agent_register? +

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

Can I rate-limit agent_register? +

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

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

agent_register is provided by the Ssyubix A2a Agentlink MCP server (syuaibsyuaib/ssyubix). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.