Electrobun Cdp Debug

Electrobun CDP Debug

Use this skill to inspect the actual desktop renderer. Do not mock electrobun.rpc in a browser when the user asks to debug the Electrobun page.

This skill uses a hybrid path:

• Use bunx --bun chrome-devtools-axi ... for ordinary Chrome sessions, public websites, and browser automation that does not depend on Electrobun.
• Use the bundled electrobun-cdp-axi.mjs raw CDP wrapper for the LLM Space Electrobun CEF renderer.
• Use the lower-level cdp-probe.mjs when JSON output or a custom one-off CDP probe is simpler. Current chrome-devtools-axi releases do not directly drive this CEF target.

Use chrome-devtools-axi For Ordinary Chrome

Invoke the CLI through Bun instead of adding a dependency:

bunx --bun chrome-devtools-axi open https://example.com
bunx --bun chrome-devtools-axi snapshot
bunx --bun chrome-devtools-axi eval 'document.title'
bunx --bun chrome-devtools-axi screenshot /tmp/page.png

If chrome-devtools-axi suggests a follow-up command beginning with chrome-devtools-axi, run it as bunx --bun chrome-devtools-axi ....

Do not add chrome-devtools-axi to package.json or bun.lock for this skill; the project uses one-off bunx --bun invocations.

Start The Desktop App

From the repo root:

mise run dev:cef

This runs the desktop app with CEF and opens CDP on 127.0.0.1:9333. If the port is busy:

LLM_SPACE_DESKTOP_CDP_PORT=9334 mise run dev:cef

Normal mise run dev keeps the native WebView renderer and does not expose CDP.

When verification needs an isolated app data root, keep runtime data outside the repo:

TMP_ROOT="$(mktemp -d "${TMPDIR:-/tmp}/llm-space-XXXXXX")"
LLM_SPACE_HOME="$TMP_ROOT" mise run dev:cef

Inspect Electrobun With The Raw CDP AXI Wrapper

Use the bundled AXI-style wrapper from the repo root:

bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs snapshot

Common variants:

bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs pages
bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs eval 'document.title'
bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs screenshot /tmp/llm-space-cef.png
bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs click @r1
bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs fill @r2 'hello'
bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs console --ms 3000
bun run .agents/skills/electrobun-cdp-debug/scripts/electrobun-cdp-axi.mjs snapshot --port 9334

The wrapper connects directly to the page target websocket from /json/list, so it avoids the chrome-devtools-axi → chrome-devtools-mcp → Puppeteer path that currently fails against Electrobun CEF. Snapshot refs such as @r1 are resolved against the current live DOM order on each command; re-run snapshot after page changes before using a ref.

Low-Level JSON Probe

Use the bundled JSON probe from the repo root when raw JSON is more useful:

bun run .agents/skills/electrobun-cdp-debug/scripts/cdp-probe.mjs

Common variants:

bun run .agents/skills/electrobun-cdp-debug/scripts/cdp-probe.mjs --screenshot /tmp/llm-space-cef.png
bun run .agents/skills/electrobun-cdp-debug/scripts/cdp-probe.mjs --eval 'document.body.innerText.slice(0, 2000)'
bun run .agents/skills/electrobun-cdp-debug/scripts/cdp-probe.mjs --console-ms 3000
bun run .agents/skills/electrobun-cdp-debug/scripts/cdp-probe.mjs --port 9334

The script connects to /json/list, picks the LLM Space page target when present, evaluates in the page context, and prints JSON.

Current chrome-devtools-axi Compatibility Limit

chrome-devtools-axi supports existing DevTools endpoints through CHROME_DEVTOOLS_AXI_BROWSER_URL, but the current CLI and its underlying chrome-devtools-mcp transport do not yet operate correctly against the Electrobun CEF endpoint exposed by mise run dev:cef.

The observed smoke test shape is:

curl -fsS http://127.0.0.1:9333/json/list
CHROME_DEVTOOLS_AXI_BROWSER_URL=http://127.0.0.1:9333 \
  CHROME_DEVTOOLS_AXI_SESSION=llm-space-electrobun \
  bunx --bun chrome-devtools-axi snapshot --full

/json/list can show the LLM Space page target, and cdp-probe.mjs can read the page successfully, but chrome-devtools-axi has been observed to return Unexpected server response: 101 or pages: 0 pages open for this CEF target.

Keep the raw CDP probe as the Electrobun renderer path until a future chrome-devtools-axi/chrome-devtools-mcp release can list, select, snapshot, evaluate, and screenshot the LLM Space page target through CHROME_DEVTOOLS_AXI_BROWSER_URL=http://127.0.0.1:9333.

Interaction Guidance

Prefer semantic DOM operations through Runtime.evaluate, for example clicking a button found by text, role, icon class, or nearby content. Use Input.dispatchMouseEvent / Input.dispatchKeyEvent only when native coordinate behavior matters.

For screenshots, use the probe's --screenshot option or CDP Page.captureScreenshot. Show the saved image to the user when visual layout is part of the task.