web — universal Playwright-backed page tool

Single skill, single Python script (web.py), single Chromium per call. Drop-in replacement for web_fetch when JS rendering / dynamic content / minor interaction is needed.

Why one cold start per call is fine

Most web tasks the agent runs are one-shot: "fetch this page", "click this and read the result", "screenshot this URL". Cold start ~2s amortizes over a single useful task. Multi-step flows where state needs to persist (login → navigate → fill form → submit → read) are rare in agent usage; if you need them, write the whole flow as one web call by chaining click=... type_text=... wait_for=....

Architecture

agent → kinclaw shell skill → python3 web.py <args>
                              → Playwright launches Chromium
                              → executes flow
                              → closes Chromium
                              → prints result
                              → exits

No sidecar, no port management, no lifecycle skill. Just pip install playwright && playwright install chromium once per machine, then web works whenever the agent needs it.

What it doesn't do

• Persistent session (cookies, login state) across calls — each call is a fresh browser. For real-account tasks, drive the user's actual Safari via osascript activate Safari + ui skill.
• Anti-bot bypass on Cloudflare / DataDome / advanced fingerprinting — Playwright defaults are detectable. Closed-source web_scrape via WEB_ENDPOINT env is the answer when this matters.
• Sub-agent autonomy — this skill executes literal instructions, it doesn't plan multi-step research. For "find me cheapest X" the agent itself drives the loop (web_search → pick URLs → web fetch each → synthesize).