LLMs author demos.
GET /api/v1/schema returns a JSON Schema. POST /api/v1/probe surfaces real ARIA targets from any URL. /docs/agents ships the system prompt + worked examples.
A demo compiler is the perfect agent target
Agents are great at writing structured specs against a schema and worse at recording video. CaptureBeam is structured-spec-in, polished-video-out — exactly the right shape. The agent never sees a frame; the runner does the visual work.
Every render of this feature is deterministic. Capture writes the metadata; the composition reads it. Re-render after a UI change to get the new output without re-recording.
Three endpoints, one self-correcting loop
- GET /api/v1/schema — what's a valid demo.yaml
- POST /api/v1/probe — what's actually on the page right now
- POST /api/v1/renders — turn this YAML into an MP4
- Agent reads the schema, probes the URL, drafts a YAML, renders, reads the error response if any, retries
Examples that work
/docs/agents ships a copy-pasteable system prompt, a complete shell-script worked example, a self-correcting agent pattern, and common patterns for per-PR demo bots and onboarding-video generation from docs URLs.
Every render of this feature is deterministic. Capture writes the metadata; the composition reads it. Re-render after a UI change to get the new output without re-recording.
Render with Agent-friendly.
$19.99/mo or $199/yr. Render through the dashboard or via the API — same access either way.