What is live-ui-testing?

A process for debugging problems that appear in a running application's interface but not in automated tests. It combines instrumentation, hands-on interaction, and measurement of what is actually drawn on screen.

Use it to reproduce screen-only bugs, drive the app, inspect its output, and gather evidence before claiming the issue is fixed.

It helps distinguish a real visual or interaction defect from a problem hidden by headless tests or an incomplete test sweep.

live-ui-testing — Skill for Claude Code and Codex by ad-repo

Install

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.

Any agent

npx skills add ad-repo/nullplayer --skill live-ui-testing

Clone the repo

git clone --depth 1 https://github.com/ad-repo/nullplayer

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ad-repo/nullplayer/live-ui-testing/github.svg)](https://agentmods.dev/skills/ad-repo/nullplayer/live-ui-testing)

Your own site

<a href="https://agentmods.dev/skills/ad-repo/nullplayer/live-ui-testing"><img src="https://agentmods.dev/badge/skills/ad-repo/nullplayer/live-ui-testing/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ad-repo/nullplayer/live-ui-testing"><img src="https://agentmods.dev/badge/skills/ad-repo/nullplayer/live-ui-testing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,885 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00089	$0.03885
Opus 5.5	$0.00036	$0.01554
Sonnet 5.5	$0.00018	$0.00777
Haiku 4.5	$0.00009	$0.00388

Measured 11d ago against content hash 10b734c44d66, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

live-ui-testing scanned grade A with 0 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 11d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/live-ui-testing/SKILL.md · 242 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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.

11d ago Changed 10b734c44d66
1mo ago First seen · 242 lines · 89 tokens per session scan A d51b4952a8d6

Subscribe to this mod's changes

live-ui-testing is a skill published in the GitHub repository ad-repo/nullplayer (178 stars, last pushed yesterday), with no licence file. It adds 89 tokens to every session and 3,885 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-27.

Debugging Testing

live-ui-testing next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
live-ui-testingad-repo/nullplayer	Skill	178	yesterday	none	A	89	Claude Code, Codex
systematic-debuggingopen-metadata/OpenMetadata	Skill	16k	yesterday	Apache-2.0	A	37	Claude Code
log-error-digestzebbern/claude-code-guide	Skill	4.7k	3d ago	MIT	A	71	Claude Code, Codex
cwv-optimizeradobe/skills	Skill	319	yesterday	Apache-2.0	A	112	Claude Code
ci-fixersipyourdrink-ltd/bernstein	Skill	1.2k	yesterday	Apache-2.0	A	15	Claude Code, Codex
incident-response-incident-responsermyndharis/antigravity-skills	Skill	1.9k	23d ago	MIT	A	36	Claude Code
triaging-web-analytics-supportPostHog/posthog	Skill	41k	yesterday	none	A	151	Claude Code, Codex