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- replay mode: scrub a completed run from checkpoint history + event timestamps — stage rail rewinds, script/storyboard/renders appear at their real moments, generating shimmer replays; ~20s full-run playback - stage history_entries exposed in BoardState (powers replay + versions) - entrance choreography plays on first paint only (not on SSE refreshes) - live-run fixes found by driving a simulated production against the board: null rendered by native append, activity ticker showing closed starts as running, scene-id label handling for 'scene-N' ids - scripts/backlot_simulate_run.py: drives a fake production through the REAL contract (init_project, in_progress heartbeats, gated awaiting_human -> approved, per-scene events, growing manifest) — live-board verification + demo driver - backlot/README.md
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Backlot — the living storyboard
A read-only local board that shows a production happening: pipeline stages
lighting up, the script as a screenplay page, the scene plan as a filmstrip
that fills in as assets generate, decisions, spend, and activity — all
derived from what the pipeline already writes to projects/<id>/.
python -m backlot open <project-id> # start server if needed + open browser
python -m backlot open # library view (all projects)
python -m backlot serve --port 4750 # run the server in the foreground
How it stays live
No agent involvement. A watchfiles watcher on projects/ publishes change
notifications over SSE; the browser refetches board state. State sources:
| Board element | Disk source |
|---|---|
| identity / rail order | project.json + pipeline_defs/<type>.yaml |
| stage states, gates, versions | checkpoint_<stage>.json + history/ |
| script card / modal | artifacts/script.json |
| filmstrip cards | scene_plan × script × asset_manifest join |
| generating shimmer, activity | events.jsonl (written by BaseTool instrumentation) |
| cost meter | checkpoint cost_snapshot |
| renders | renders/*.mp4 (+ root-level mp4 heuristic) |
Projects without checkpoints degrade gracefully to a "what the watcher found" view — media, snapshots, renders.
Replay: a completed run can be scrubbed end-to-end (▶ REPLAY RUN on the board) — reconstructed from checkpoint history and event timestamps.
Try it without a real production:
python scripts/backlot_simulate_run.py # live demo run (~1 min)
python -m backlot open backlot-demo-run
Design doc: internal/design/LIVING_STORYBOARD.md.