X9 browser session

Browser session

Use this skill in Claude Code and Codex. It owns shared route selection, the verified Edge adapter, runtime-specific extension and in-app surfaces, CDP fallbacks, task-tab isolation, and focus safety. Re-check installed tool instructions and live schemas when a named surface is absent.

Choose the surface

1. Prefer a purpose-built connector, API, or CLI when it can perform the semantic operation. An explicit request to open, inspect, or operate a browser UI overrides this preference.
2. If the user explicitly requests the runtime's in-app browser, use it immediately. That explicit choice is sticky: do not substitute Edge or another browser after an authentication or connection failure unless the user approves the switch.
3. For local web development and previews, use the runtime's in-app browser unless the user explicitly requests Edge:
   • Codex: its in-app browser;
   • Claude Code: its Browser pane.
4. For every other browser-control task, use the runtime-specific default:
   • Codex: its browser extension in the verified Edge profile;
   • Claude Code: chrome-devtools MCP against that Edge profile. Do not use the Claude browser extension unless the user explicitly requests it.
5. In Codex, if the extension is unavailable, disconnected, or lacks a required DevTools capability, retry its documented recovery once and then use chrome-devtools MCP against the same Edge profile.
6. If MCP cannot attach or cannot perform the required operation, use agent-edge, which connects agent-browser to the same Edge profile. Because the current agent-browser brings newly created and selected tabs to the foreground, use this fallback only when the user is not simultaneously working in Edge. If that condition is unknown and the fallback would require creating or switching tabs, ask one short question instead of taking over the window.
7. Once a controller works, keep it through ordinary stale-reference, redraw, and timeout errors. Do not alternate controllers on the same task tab.

The in-app browser remains the isolated route for an explicit request and for local web development in both runtimes. It has a separate profile and does not carry the user's Edge extensions. Use Edge when exact account state, region, cart, saved data, personalized content, ad blocking, or another installed extension matters.

Shared Edge safety

Treat the executable, profile, extensions, localhost CDP endpoint, launcher, and controllers as adapter parameters. On another machine, substitute and verify them instead of copying the Edge-specific values below.

• use the dedicated, continuously used automation profile rather than the browser's default profile;
• attach every controller to that same existing Edge profile rather than launching a clean browser;
• create a task-owned background tab; never assume the user's active tab is the task tab;
• with an extension, use its session-owned logical task tab and leave it inactive;
• with chrome-devtools, create the page with background: true, select it with bringToFront: false, and never invoke Page.bringToFront or Target.activateTarget;
• never control one tab through the extension and CDP at the same time;
• keep credentials, cookies, tokens, and local storage in the dedicated browser profile rather than copying them into prompts or repository files;
• assume the controller and model can receive inspected page contents and network data; avoid opening unrelated private surfaces, do not capture network headers unless the task requires them, and never echo secret header values into chat, logs, or files.

Do not run browser-wide HAR or broad network capture in the personal Edge profile. Use a clean standalone agent-browser session for that work.

Verified Edge adapter

• Profile: ~/Library/Application Support/Microsoft Edge Automation.
• Launcher: ~/Applications/Edge (Agent).app with remote-debugging port 9222.
• Codex primary outside the local-development and explicit in-app exceptions: the ChatGPT browser extension installed in this Edge.
• Claude Code primary outside the local-development exception: chrome-devtools MCP.
• Codex first fallback: chrome-devtools MCP configured with --browserUrl http://127.0.0.1:9222.
• Last fallback: agent-edge, which wraps agent-browser --cdp 9222 against the same profile.
• Leave pre-existing tabs, windows, downloads, bookmarks, and settings untouched.
• Re-snapshot after navigation, filtering, modal changes, and redraws because element references become stale.
• If an Edge route cannot attach, confirm that Edge (Agent).app is running before declaring that controller unavailable.

Read before mutating. Posting, purchasing, sending, deleting, or changing account data still requires authority from the user's request.

Claude Code

• For local web development, previews, and an explicit request for the built-in browser, use the Claude Code Browser pane according to the current global CLAUDE.md. This exception remains primary for that scope.
• For other browser work, use the chrome-devtools MCP from ~/.claude.json with the shared focus-safe rules. Do not initialize or fall back to the Claude browser extension unless the user explicitly requests that extension.
• If MCP tools are absent after Edge is running, restart Claude Code once. Use agent-edge only under the shared unattended-Edge condition.

Codex

• For local web development, previews, and an explicit request for the in-app browser, read and follow browser:control-in-app-browser and select its distinct in-app binding immediately. This exception remains primary for that scope.
• For other browser work, select the Edge extension directly. Do not let getDefault() or getForUrl() silently choose the in-app browser. Read and follow the installed chrome:control-chrome skill; it owns the current setup and extension APIs.
• If the Edge extension remains unavailable after its documented troubleshooting, use the chrome-devtools MCP from ~/.codex/config.toml with the shared focus-safe rules.
• If MCP tools are absent after Edge is running, restart Codex once. Use agent-edge only under the shared unattended-Edge condition.

Install an adapter

Read references/setup.md for the portable adapter contract and the verified Edge example. Never commit browser profile contents or credentials.

Failure behavior

Report cancelled or failed browser calls as failures. For an implicit/default Edge selection, use the runtime-specific chain: Codex extension → MCP → agent-edge; Claude Code MCP → agent-edge. For an explicit in-app choice, do not enter an Edge chain without approval. If an implicitly selected local-development browser is unavailable, use the runtime's Edge chain and report the fallback. Do not substitute remembered data or a public page when the task required the authenticated source. Return DEGRADED or BLOCKED with the failed route and missing prerequisite when the permitted chain is exhausted.

Done

Report the runtime, browser surface, controller, task-owned tab or page, requested result, and any checks that could not be completed. For mutating work, verify the resulting UI state or server response before claiming completion.