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From a host's edit page, an operator can run a playbook against just that host via an ephemeral one-host inventory — no need for the host to exist in a source inventory. - ansible/sources.py: pure host_inventory_content(host) -> '<name> ansible_host=<addr>' - executor.start_run: optional inventory_content written to the temp dir and used as -i (overrides inventory_path); cleaned up with the creds dir - hosts/routes.py: POST /hosts/<id>/run-playbook (operator) — validates source + playbook, builds the ephemeral inventory, starts a user-triggered run, redirects to the live run detail; edit page gets the ansible source list - hosts/form.html: 'Run Ansible playbook against this host' panel (shown when editing an existing host and sources exist) — source + playbook + extra-vars/ tags/dry-run (no --limit; single host) - tests: unit host_inventory_content; integration runs a hosts:all/connection:local playbook against the ephemeral inventory and asserts inventory_hostname Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>