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/thangchung/agent-engineering-experiment/playwright-clinpx skills add thangchung/agent-engineering-experiment --skill playwright-cligit clone --depth 1 https://github.com/thangchung/agent-engineering-experimentWhat 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 | $0.00019 | $0.03018 |
| Opus 5 | $0.00010 | $0.01509 |
| Sonnet 5 | $0.00004 | $0.00604 |
| Haiku 4.5 | $0.00002 | $0.00302 |
Grade A, and why
playwright-cli 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 2d 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.
This is a copy
100% identical to playwright-cli — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 421 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Automation with playwright-cli
Quick start
# open new browser
playwright-cli open
# navigate to a page
playwright-cli goto https://playwright.dev
# interact with the page using refs from the snapshot
playwright-cli click e15
playwright-cli type "page.click"
playwright-cli press Enter
# take a screenshot (rarely used, as snapshot is more common)
playwright-cli screenshot
# close the browser
playwright-cli close
Commands
Core
playwright-cli open
# open and navigate right away
playwright-cli open https://example.com/
playwright-cli goto https://playwright.dev
playwright-cli type "search query"
playwright-cli click e3
playwright-cli dblclick e7
# --submit presses Enter after filling the element
playwright-cli fill e5 "[email protected]" --submit
playwright-cli drag e2 e8
# drop files or data onto an element (from outside the page)
playwright-cli drop e4 --path=./image.png
playwright-cli drop e4 --data="text/plain=hello world"
playwright-cli hover e4
playwright-cli select e9 "option-value"
playwright-cli upload ./document.pdf
playwright-cli check e12
playwright-cli uncheck e12
playwright-cli snapshot
# search the snapshot for text or a regexp, returns matching nodes with surrounding context
playwright-cli find "Sign in"
playwright-cli find --regex "Sign (in|up)"
# wrap the regexp in slashes to add flags, e.g. /i for case-insensitive
playwright-cli find --regex "/sign (in|up)/i"
playwright-cli eval "document.title"
playwright-cli eval "el => el.textContent" e5
# get element id, class, or any attribute not visible in the snapshot
playwright-cli eval "el => el.id" e5
playwright-cli eval "el => el.getAttribute('data-testid')" e5
playwright-cli dialog-accept
playwright-cli dialog-accept "confirmation text"
playwright-cli dialog-dismiss
playwright-cli resize 1920 1080
playwright-cli close
Navigation
playwright-cli go-back
playwright-cli go-forward
playwright-cli reload
Keyboard
playwright-cli press Enter
playwright-cli press ArrowDown
playwright-cli keydown Shift
playwright-cli keyup Shift
What ships with it
9 files 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.
- references/element-attributes.md 665 B
- references/playwright-tests.md 1.7 KB
- references/request-mocking.md 2.1 KB
- references/running-code.md 5.5 KB
- references/session-management.md 5.5 KB
- references/storage-state.md 5.1 KB
- references/test-generation.md 16 KB
- references/tracing.md 3.4 KB
- references/video-recording.md 5.3 KB
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.
- 2d ago First seen · 421 lines · 19 tokens per session scan A 29c0b669a524
playwright-cli is a skill published in the GitHub repository thangchung/agent-engineering-experiment (24 stars, last pushed 1mo ago), licensed MIT. It adds 19 tokens to every session and 3,018 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to playwright-cli, differing in 5 lines, and is treated as a copy.
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