acl_add_peer · Yaver MCP: Risk & Policy

WHAT IT DOES

What acl_add_peer does on Yaver

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

PARAMETERS

Parameter	Type	Required	Description
`url`	string	Yes	MCP endpoint URL
`auth`	string	—	Bearer token
`name`	string	Yes	Peer name

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why acl_add_peer needs a policy

An AI agent can call acl_add_peer faster than any human can review — one bad instruction and it creates or modifies resources in Yaver by the hundred, each call as confident as the last.

Risk signalsAccepts URL/endpoint input (url) · Handles credentials or secrets (auth)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

acl_add_peer Rate-limited

acl_add_peer 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": {
    "acl_add_peer": {
      "limits": [
        {
          "counter": "acl_add_peer_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 Yaver, so you can run agents against it safely.

FAQ

Questions about acl_add_peer

What does the acl_add_peer tool do? +

Connect to another MCP server (local or remote). It is categorised as a Write tool in the Yaver MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does acl_add_peer accept? +

acl_add_peer accepts 3 parameters: url, auth, name. Required: url, name. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on acl_add_peer? +

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

What risk level is acl_add_peer? +

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

Can I rate-limit acl_add_peer? +

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

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

acl_add_peer is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.