CDP — browser-harness-js skill

Custom codegen'd CDP SDK (every method from browser_protocol.json + js_protocol.json gets a typed wrapper) plus a tiny HTTP server that holds one persistent CDP Session. The browser-harness-js CLI auto-starts the server on first use and forwards JS snippets to it.

The SDK lives in the skill's sdk/ directory. In the rest of this doc, <skill-dir> refers to wherever npx skills add installed the skill (Claude Code: ~/.claude/skills/cdp; Cursor: ~/.cursor/skills/cdp; other agents vary). The CLI should be on PATH as browser-harness-js.

How to use

Just run browser-harness-js '<JS>'. The first call spawns the server in the background; subsequent calls hit the same process and so reuse the same session, the same WebSocket to the browser, and any globals you set.

browser-harness-js 'await session.connect()'
browser-harness-js 'await session.Page.navigate({url:"https://example.com"})'
browser-harness-js '(await session.Runtime.evaluate({expression:"document.title",returnByValue:true})).result.value'

Output is the raw result content — no {ok,result} envelope.