ntucool: Skill for Claude Code

Demo recording

The demo/ directory has two independent recipes. Both produce a GIF and optionally a .cast for sharing on asciinema.org.

Demo	Tool	Driver	Output
CLI	VHS	Scripted tape	demo/cli.gif
MCP / agent	asciinema + agg	Interactive — user drives Claude Code	demo/mcp.cast + demo/mcp.gif

Pick VHS when the content is fully scriptable and you want a deterministic artifact that re-runs cleanly after every change. Pick asciinema when authenticity matters — real timing, real agent reasoning, real tool calls — which scripting would flatten.

CLI demo (VHS)

demo/
├── cli.tape       VHS script: command sequence + styling
├── record.sh      Entry point — sets PATH, runs vhs
├── bin/cool       Masking wrapper around the real `cool` binary
├── redact.py      Masks personal data on stdout
└── cli.gif        Output

Regenerate: ./demo/record.sh

The script puts demo/bin first on PATH so cool in the tape resolves to the masking wrapper. The wrapper finds the real cool by scanning PATH minus its own directory, then pipes stdout through redact.py.

Tweaking commands shown. Edit the Type "cool ..." blocks in cli.tape. Each follows the pattern Type / Sleep / Enter / Sleep — the first sleep lets viewers register the command, the second lets them read the output.

Tweaking styling. The Set block at the top of cli.tape controls FontSize, Theme, WindowBar, BorderRadius, Margin, etc. The current theme is Catppuccin Mocha; vhs themes lists alternatives.

MCP demo (asciinema + agg)

demo/
├── record-mcp.sh    Entry point — prints prompts, records, redacts, renders
├── redact_cast.py   Applies redact.py to each output event of a .cast
├── mcp.raw.cast     Pre-redaction recording (review then delete)
├── mcp.cast         Redacted recording (shareable)
└── mcp.gif          Rendered GIF

Record: ./demo/record-mcp.sh

The script:

1. Prints three suggested prompts and pauses for confirmation.
2. Launches asciinema rec --command "claude --dangerously-skip-permissions" so the recording IS the Claude Code session — when the user /exits, recording stops.
3. Pipes the raw cast through redact_cast.py.
4. Greps the redacted cast for residual PII and warns if anything leaked across event chunks.
5. Runs agg to render the GIF.