Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/nearform/lastlight/demonpx skills add nearform/lastlight --skill demogit clone --depth 1 https://github.com/nearform/lastlightWrote 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.
[](https://agentmods.dev/skills/nearform/lastlight/demo)<a href="https://agentmods.dev/skills/nearform/lastlight/demo"><img src="https://agentmods.dev/badge/skills/nearform/lastlight/demo.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00075 | $0.02638 |
| Opus 5 | $0.00037 | $0.01319 |
| Sonnet 5 | $0.00015 | $0.00528 |
| Haiku 4.5 | $0.00007 | $0.00264 |
Grade A, and why
demo scanned grade A with 1 finding 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 6d 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.
CLI, a curl-able API, or pure pass/fail evidence, use `qa-test`/`verify`. For How it starts
The opening of the file, as written. The whole thing — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Demo
Turn a PR or feature into a short, polished demo video: drive the repo's web UI in a real headless Chromium, screen-record the session, and composite a titled, size-capped mp4 the maintainer can watch inline.
This is the video sibling of browser-qa (screenshots) and verify/
qa-test (text evidence). It only works on the lastlight-sandbox-qa:latest
docker image, which bakes in Playwright + Chromium and ffmpeg. You have
bash + file tools but no vision — you reason over the driver's JSON stdout
and the ffprobe summary; you never "see" the video.
Compositing is ffmpeg only — there is no Remotion / cinematic-effects pipeline. You get a title card, optional before/after side-by-side, trim/speed, and a size cap. That's the deliverable: a clear, honest walkthrough, not a marketing reel.
This skill uses browser-qa (the headless driver) and building (install
- start the dev-server).
When this applies
A phase on the docker QA image whose target is a web app the repo serves on
localhost, where a moving demonstration adds value over a screenshot. For a
CLI, a curl-able API, or pure pass/fail evidence, use qa-test/verify. For
static screenshot evidence, use browser-qa. Don't record a video you don't
need.
FIRST — probe for a browser
The browser driver lives in the browser-qa skill bundle at
<browser-qa-dir>/scripts/agent-browser.mjs, and this skill's compositor at
<demo-dir>/scripts/compose-demo.sh. Resolve both <…-dir> paths from the
available-skills catalogue (it gives each skill's absolute staged path); do not
assume a relative path from $PWD — your cwd is the checked-out repo, the
bundles are siblings.
Run the runtime probe before anything else:
node <browser-qa-dir>/scripts/agent-browser.mjs doctor
- Exit 0 with
{"ok":true,...}→ proceed. - Exit non-zero (lean image / gondolin / no Chromium) → DO NOT attempt a demo. Report that the demo path was unavailable on this host and stop. (The workflow gates this phase to the QA image, so this should be rare — but never fake a recording.)
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 6d ago First seen · 229 lines · 75 tokens per session scan A be0fbf8e8aef
demo is a skill published in the GitHub repository nearform/lastlight (22 stars, last pushed 2d ago), licensed MIT. It adds 75 tokens to every session and 2,638 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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