template_use · Yaver MCP: Risk & Policy

WHAT IT DOES

What template_use does on Yaver

AI agents use template_use 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
`name`	string	Yes	Template name
`project_name`	string	—	Project name

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why template_use needs a policy

An AI agent can call template_use 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.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

template_use Rate-limited

template_use 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": {
    "template_use": {
      "limits": [
        {
          "counter": "template_use_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 template_use

What does the template_use tool do? +

Apply a full-stack template to create a new project. 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 template_use accept? +

template_use accepts 2 parameters: name, project_name. Required: name. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on template_use? +

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

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

Can I rate-limit template_use? +

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

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

template_use 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.