agent_send · Ssyubix A2a Agentlink MCP: Risk & Policy

WHAT IT DOES

What agent_send does on Ssyubix A2a Agentlink

AI agents use agent_send 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_send needs a policy

The tool sends messages between agents, which constitutes creating/modifying data (a message in the recipient's inbox). While it has network-level effects, it is not destructive (messages can be deleted), does not execute arbitrary code or commands on the target system, and does not move money.

From the tool's definition Tool name 'agent_send' and description 'Kirim pesan langsung ke satu peer via Cloudflare relay' (Send direct message to one peer via Cloudflare relay) indicates the tool creates/transmits a message to another agent.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

agent_send Rate-limited

agent_send 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_send": {
      "limits": [
        {
          "counter": "agent_send_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_send

What does the agent_send tool do? +

Kirim pesan langsung ke satu peer via Cloudflare relay. 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_send? +

Register the Ssyubix A2a Agentlink MCP server in PolicyLayer and add a rule for agent_send: 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_send? +

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

Can I rate-limit agent_send? +

Yes. Add a rate_limit block to the agent_send 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_send completely? +

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

agent_send 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.