tunnel_add

Add a Cloudflare Tunnel endpoint for NAT traversal.

SERVERYaver SOURCEyaver-cli

Medium RISK CLASS

Category Write

Parameters 41 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-kivanccakmak-yaver/tunnel-add.md

WHAT IT DOES

What tunnel_add does on Yaver

AI agents use tunnel_add 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.

Parameter	Type	Required	Description
`url`	string	Yes	Tunnel URL (e.g. https://my-tunnel.example.com)
`label`	string	—	Human-readable label (optional)
`cf_client_id`	string	—	CF Access Service Token Client ID (optional)
`cf_client_secret`	string	—	CF Access Service Token Client Secret (optional)

Parameters from the server's own tool schema.

RISK

Why tunnel_add is rated Medium

This tool creates a new Cloudflare Tunnel endpoint, which is a Write operation (creates a new network resource). Misuse could expose internal services to the internet, giving it medium severity, but it is reversible (tunnels can be removed).

From the tool's definition Add a Cloudflare Tunnel endpoint for NAT traversal

Risk signalsAccepts URL/endpoint input (url)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs tunnel_add safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Yaver, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For tunnel_add, this is the rule to start with:

tunnel_add Rate-limited

tunnel_add 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": {
    "tunnel_add": {
      "limits": [
        {
          "counter": "tunnel_add_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 Yaver, apply this rule, and every tunnel_add call is checked against it from then on.

FAQ

Questions about tunnel_add

What does the tunnel_add tool do? +

Add a Cloudflare Tunnel endpoint for NAT traversal. 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 tunnel_add accept? +

tunnel_add accepts 4 parameters: url, label, cf_client_id, cf_client_secret. Required: url. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on tunnel_add? +

Register the Yaver MCP server in PolicyLayer and add a rule for tunnel_add: 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 tunnel_add? +

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

Can I rate-limit tunnel_add? +

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

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

tunnel_add 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.

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