A LARE, LLC product

Highlight a passage and ask about it in place.

A Chrome extension that opens a chat on the text you select. Replies come from the official AI command-line tools you already sign into on your computer. No API keys.

Add to Chrome View on GitHub

Open source. Install instructions are on GitHub.

fieldnotes.example/the-night-the-fog-missed-the-headland

Field notes

The night the fog missed the headland

November 13, 2026

By ten the horn had gone quiet. The keeper walked the east wall with a thermos and counted the intervals anyway.

The fog missed the headland entirely. It sat in a pale bank offshore, bright enough to read by, and left the rocks dry and ordinary under the lamp.

He wrote that down because it was the sort of thing that would sound invented later.

Double Click AI

Codex

☰

The fog missed the headland entirely. It sat in a pale bank offshore, bright enough to read by, and left the rocks dry and ordinary under the lamp.

What is this night about?

The keeper is recording a seam: a clear shore sitting next to a wall of fog that never comes in.

Why would he underline it?

Underlining is a second look—a mark for later, not a flourish added after the fact.

Ask about this highlight

Stop

Enter to send · Shift+Enter for a new line · Esc to close

How it works

Highlight, ask, and keep the thread.

The chat stays attached to the passage you selected. Follow-up questions continue the same conversation.

Highlight

Select a passage on any page. A small Ask button appears beside it. Click it, or press Alt+Shift+D.

Ask

Choose a provider and type a question. The passage is sent as context, and the reply streams in as formatted text.

Keep the thread

Ask a follow-up in the same pop-up. Later, reopen the conversation from history—pages, highlights, and chats, stored in this browser.

Providers

Uses the AI you already pay for.

Double Click AI does not sell model access. It starts the official CLI you have installed and already signed into. Usage stays on that subscription.

ChatGPT via Codex

Uses your ChatGPT sign-in through the Codex CLI.

codex

Grok

Uses a SuperGrok or X Premium+ sign-in through Grok Build.

grok

Claude (opt-in)

Uses a Claude subscription through Claude Code. Off until you turn it on.

claude

GitHub Copilot

Uses your Copilot subscription through the Copilot CLI.

copilot

Cursor

Uses your Cursor account through the Cursor agent CLI.

cursor-agent

Google Antigravity

Uses a Google AI account through the Antigravity CLI.

agy

It runs through the official CLIs you are signed into. Nothing in Double Click AI asks for an API key, and the helper removes API-key environment variables so a tool does not silently switch to metered billing. If a CLI is missing or you are not signed in, the chat shows the install or login command. Claude Code stays off until you enable it. Anthropic’s terms do not allow third-party products to route requests through Claude plan credentials. Double Click AI only starts the Claude Code program already on your machine and never reads your login files.

Privacy

It runs on your computer.

There is no Double Click AI server for your highlights or chats. The helper is a local program that Chrome starts itself.

A local helper

Chrome launches the helper through native messaging. It speaks only to this extension and does not open a listening port.

What leaves the machine

Only the highlighted passage, the page title and address, and the question you type go to the provider you pick, through its official CLI.

History stays here

Pages, highlights, and conversations are stored in this browser, on this computer. You can search them, reopen one, or delete them.

Read the privacy policy

History

Pages, highlights, and conversations in one place.

The toolbar icon opens a side panel of what you have asked about. Conversations are grouped by page, then by highlight. Search the list, reopen a thread to continue it, or delete a conversation or a whole page.

Double Click AI Passages and conversations stored on this computer.

Search pages and conversations

The night the fog missed the headland

fieldnotes.example/the-night-the-fog-missed-the-headland

The fog missed the headland entirely. It sat in a pale bank offshore, bright enough to read by, and left the rocks dry and ordinary under the lamp.

Codex · Nov 13, 7:46 PM

A clear night is not a story. A clear night next to a wall of fog is a seam, and seams are where people look twice.

Grok · Nov 13, 7:40 PM

Counting the intervals

harbor-log.example/counting-the-intervals

The keeper walked the east wall with a thermos and counted the intervals anyway, the way you check a lock you already know is shut.

Copilot · Nov 13, 6:12 PM

Open source

The source is public.

Double Click AI is open source. You can read how the helper launches each CLI, how a conversation is resumed, and how API-key environment variables are stripped. Issues and changes happen in the repository.

View on GitHub

The repository is github.com/lonnylot/double-click. You can also load the extension unpacked from a local clone and register the helper with node install.js.

Install

Add the extension, then register the helper.

Install from the repository for now. A small local helper has to be registered once so Chrome can start it.

1

Add the extension

Follow the install instructions on GitHub and load Double Click AI unpacked from the extension folder.
2

Register the helper

From the project folder, run node install.js. The same step will be available as an npx command when the package is published. Run the installer again if you move the repo or upgrade Node.
3

Sign in to a CLI

Sign in to whichever tool you want to use, in a terminal—for example codex login or grok login. Then highlight text on a page and click Ask.

double-click — zsh

~/Projects/double-click % node install.js

Double Click AI helper registered.
Extension ID: dkaimfjbcdiaeialfejfhppmlmcafabc
Allowed origin: chrome-extension://dkaimfjbcdiaeialfejfhppmlmcafabc/
Launcher: /Users/you/.double-click/double-click-host
Host manifests: 6

~/Projects/double-click % npx double-click-ai
# same helper registration, once the package is published

~/Projects/double-click %

FAQ

Questions that come up first.

Do I need an API key?

No. Double Click AI starts the official CLI you are already signed into. The helper removes API-key environment variables so a tool does not silently switch to metered billing.

What does the helper do?

It is a small local program that Chrome starts through native messaging. It talks only to this extension and does not open a listening port. Each turn runs in an empty temporary folder.

Why is Claude off by default?

Anthropic’s terms do not allow third-party products to route requests through Claude plan credentials. Double Click AI only starts the Claude Code program already installed on your computer and never reads your login files. Turn it on only if you accept that arrangement. The switch is in the chat and again under Providers in history.

Where is conversation history stored?

In this browser, on this computer. Double Click AI does not host your highlights or chats.

Can I install it from the repository?

Yes. Load the unpacked extension from the extension folder, then run node install.js. The source is at github.com/lonnylot/double-click.

What is the keyboard shortcut?

Alt+Shift+D, after you have selected text.

Highlight a passage and ask about it in place.

Highlight, ask, and keep the thread.

Highlight

Ask

Keep the thread

Uses the AI you already pay for.

ChatGPT via Codex

Grok

Claude (opt-in)

GitHub Copilot

Cursor

Google Antigravity

It runs on your computer.

A local helper

What leaves the machine

History stays here

Pages, highlights, and conversations in one place.

The source is public.

Add the extension, then register the helper.

Add the extension

Register the helper

Sign in to a CLI

Questions that come up first.

Do I need an API key?

What does the helper do?

Why is Claude off by default?

Where is conversation history stored?

Can I install it from the repository?

What is the keyboard shortcut?