companion_down
Disarm a companion project: remove its scheduled crons and stop/remove its durable service units.
This record as markdown: /tools/io-github-kivanccakmak-yaver/companion-down.md
What companion_down does on Yaver
AI agents call companion_down to permanently remove resources in Yaver, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
| Parameter | Type | Required | Description |
|---|---|---|---|
project | string | Yes | Companion project slug |
Parameters from the server's own tool schema.
Why companion_down is rated Critical
This tool performs irreversible operations: removing scheduled cron jobs and permanently stopping/removing durable service units. These actions cannot be easily undone and represent a loss of configured automation and service continuity. While not a data deletion in the traditional sense, the removal of infrastructure components and their configurations is permanent and disruptive.
From the tool's definition Tool description states: 'remove its scheduled crons and stop/remove its durable service units.' The verbs 'remove' and 'stop/remove' indicate irreversible deletion or termination of infrastructure components.
Attacks that exploit this kind of access
The rule that runs companion_down 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 companion_down, this is the rule to start with:
companion_down is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Yaver, apply this rule, and every companion_down call is checked against it from then on.
Questions about companion_down
Disarm a companion project: remove its scheduled crons and stop/remove its durable service units. It is categorised as a Destructive tool in the Yaver MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
companion_down accepts 1 parameter: project. Required: project. The full parameter table on this page comes from the server's own tool schema.
Register the Yaver MCP server in PolicyLayer and add a rule for companion_down: 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.
companion_down is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the companion_down 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.
Set action: deny in the PolicyLayer policy for companion_down. 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.
companion_down 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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