slicc: Skill for Claude Code

.agents/skills/demo-recording/SKILL.md

demo-recording is a skill for Claude Code, Codex from ai-ecoverse/slicc. It costs 118 tokens per session (9,044 once invoked), scanned A, original, Apache-2.0.

A workflow for recording videos of changes to a web interface for a pull request. It can capture the existing browser test session or produce a cursor-animated MP4 for demonstration.

In plain words
What is it for?
Use it to record before-and-after UI changes, inspect browser behaviour, make showcase videos, and attach recordings to GitHub pull requests.
Why use it?
It provides visual evidence of what changed, either frame by frame for review or as a polished clip that can be attached to the code review.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is ai-ecoverse/slicc's own configuration. It tells Claude Code and Codex how to work on slicc itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything slicc configures →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is node packages/dev-tools/tools/slicc-screencast.mjs \.

Reuse

Borrowing it

Nothing to install: this file belongs to ai-ecoverse/slicc. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ai-ecoverse/slicc/main/.agents/skills/demo-recording/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/ai-ecoverse/slicc

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for demo-recording

README.md
[![agentmods](https://agentmods.dev/badge/skills/ai-ecoverse/slicc/demo-recording/github.svg)](https://agentmods.dev/skills/ai-ecoverse/slicc/demo-recording)
Your own site
<a href="https://agentmods.dev/skills/ai-ecoverse/slicc/demo-recording"><img src="https://agentmods.dev/badge/skills/ai-ecoverse/slicc/demo-recording/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for demo-recording

Your own site · 80×15
<a href="https://agentmods.dev/skills/ai-ecoverse/slicc/demo-recording"><img src="https://agentmods.dev/badge/skills/ai-ecoverse/slicc/demo-recording.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 118 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,044 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 10 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium MCP Rug Pull · line 47
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium Prompt Injection · line 82
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 84
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 85
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 87
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 88
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 89
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 90
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 91
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 92
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00118 $0.09044
Opus 5 $0.00059 $0.04522
Sonnet 5 $0.00024 $0.01809
Haiku 4.5 $0.00012 $0.00904

Measured 5d ago against content hash 2490d9ab1517, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

demo-recording scanned grade A with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

`curl` the candidate port or check the dev script before wiring a recording

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, stderr=subprocess.DEVNULL)
.agents/skills/demo-recording/SKILL.md · 823 lines

How it starts

The opening of the file, as written. The whole thing — 823 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Demo Recording

Record a video of a SLICC UI change for a pull request, then upload it with gh --attach (see § Embedding in GitHub PRs; needs gh >= 2.99). Pick the mode that fits.

Two capture modes

  • CDP screencast (§ CDP screencast) — attaches over Chrome DevTools Protocol to the leader tab the dev/e2e harness already drives, streams Page.startScreencast frames to disk, and optionally stitches a webm. Fast, no separate browser, source-of-truth frames for "what changed". Use to review UI changes frame-by-frame or capture a before/after for a PR.
  • Polished cursor-animated MP4 (§ Polished MP4 with playwright-cli) — playwright-cli video-start/stop with an injected visible cursor and chapter markers, post-processed into a GitHub-embeddable MP4. Use for showcase demos.

CDP screencast (frame capture of the running harness)

packages/dev-tools/tools/slicc-screencast.mjs attaches to Chrome's remote debugging port, locks onto the SLICC leader page target, and streams Page.startScreencast frames to disk as frame-000001.jpeg … plus a manifest.json (real capture timestamps). It records the same Chrome the harness already uses — so you review exactly what the harness rendered. It is a host-side node tool (like slicc-debug.mjs), not a SLICC shell command.

Quick start (against the deterministic fake-LLM e2e harness)

The e2e harness (packages/webapp/tests/e2e/playwright.config.ts) boots wrangler (UI on :8787), the node-server thin-bridge, and the fake LLM, and launches Chrome with --remote-debugging-port=9222. Reuse it to get a reproducible run:

# 0. one-time in a fresh VM: system libs for Chrome + ffmpeg
npx playwright install chromium && npx playwright install-deps chromium

# 1. start the recorder against the harness Chrome, locked to the leader tab
node packages/dev-tools/tools/slicc-screencast.mjs \
  --port 9222 --url localhost:8787 --out /tmp/shot --video &

# 2. drive the UI (see below), then stop the recorder
kill -INT %1            # flushes manifest.json (+ screencast.webm if --video)

Read the full file on GitHub · 823 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 823 lines · 118 tokens per session scan A 2490d9ab1517

Subscribe to this mod's changes

demo-recording is a skill published in the GitHub repository ai-ecoverse/slicc (30 stars, last pushed today), licensed Apache-2.0. It adds 118 tokens to every session and 9,044 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 2 findings (makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.

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