Clapper

▶ Play the intro · 25 seconds · sound on · Video file · Source

Install the skill for your coding agent:

npx skills add ArchAstro/clapper --skill clapper --global

Choose your agent when prompted, then start a new session and ask:

Use the Clapper skill to make a video with original music. Set up everything needed.

The skill installs Clapper, prepares the runtime, creates the project, and guides visual/audio review. No separate Clapper setup is required.

If you don't have npx, ask your agent to install the skill from skills/clapper.

Voice narration

Optional local speech with multiple locked narrator voices: see Narration. Run clapper voices install only when needed; model weights and the inference runtime are not included in the default install.

Technical-video evals (checkout)

The evaluation suite runs frozen briefs, real render/evidence collection, independent judgments and blind comparisons. Use node packages/cli/bin/clapper.mjs eval --help. It never treats missing observations as approval or claims learning gains from model-generated reviewers.

See the benchmark index for the technical-video evals and Nimbus cross-framework comparison.