Hand over ServiceNow assets to the right person, on the record

**Objective:** Assign asset `{asset-tag}` to `{assign-to}`, or return it to stock if `{assign-to}` is blank, recording `{reason}`.

**Step 1: Read the asset**

Call `servicenow-get-asset` with asset-tag `{asset-tag}`. Keep sys-id, display-name, state, assigned-to and location. If the asset is Retired or Disposed, stop.

**Step 2: Check the new holder (if `{assign-to}` is given)**

Call `servicenow-get-user` with name `{assign-to}`. The user must be unique and active. Note their location.

**Step 3: Confirm**

Show: asset, current holder and state, new holder (or "stock"), new state (In use when assigning, In stock when returning), location (the new holder's location when assigning), and the comment. Ask for an explicit yes.

**Step 4: Write once**

Call `servicenow-update-asset` once with sys-id and:

* assigning: assigned-to `{assign-to}`, install-status In use, location from Step 2 if the user confirmed it
* returning: install-status In stock and a substatus of Available if that value is listed

Add comments "`{reason}`" when given. When returning, tell the user that the tool cannot blank the assigned-to field, so the previous holder may still show until it is cleared in ServiceNow.

**Step 5: Verify**

Re-read with `servicenow-get-asset` and report the before and after holder, state and location.

**Rules & Guidelines:**

* The only write tool this prompt may call is `servicenow-update-asset`, once, after confirmation. Do not call `servicenow-update-configuration-item` or `servicenow-update-user`.

**Validation:**

* If `{asset-tag}` is not found, retry with serial-number set to the same value before giving up.