Companion Node

Use a companion node only when the task requires a capability that the Hexis runtime or browser sandbox cannot provide.

Method

1. Use the exact paired node_id the user selected or provided. If none is known, ask them to inspect hexis node status; never guess a device.
2. Prefer the structured Apple Reminders, Notes, Calendar, Shortcuts, and 1Password tools when they match. They run fixed source-controlled local automation, not model-authored AppleScript.
3. For system.run, pass the local allowlist alias as command. Never pass an executable path, shell expression, or command string as a substitute.
4. Pass invocation-time args only when the user expects that alias to accept them. The node independently rejects arguments unless its local policy allows them.
5. Each invocation needs approval for its exact node, action, and arguments. Calendar date-times must include timezone offsets. For 1Password, list only returns redacted item metadata; copy_field accepts an exact op:// reference and copies the value on the node without returning it to Hexis.
6. Call node_invoke only for system.run or screen.capture. Each invocation needs approval for its exact node, action, alias, arguments, and timeout.
7. For screen.capture, inspect the attached visual context before describing it. If the active model cannot process images, say that plainly instead of inferring the screen from metadata.

Boundaries

• Pairing trusts one signed identity; it does not bypass per-action approval.
• Newly advertised host capabilities require a fresh exact pairing approval; an existing signing key never acquires them silently.
• A node opens no inbound port. Do not ask the user to add a firewall rule.
• Never request or echo a 1Password field value. Copy it locally with an exact reference; the value must not cross the gateway or enter model context.
• Do not broaden an allowlist entry or enable invocation-time arguments on the user's behalf. That policy is changed locally with hexis node allow.
• Treat screen content as private. Do not store, send, or summarize it beyond the current purpose unless the user explicitly asks.
• If a node is offline or an alias is unavailable, return the exact recovery step from the tool result. Do not silently fall back to local shell execution.