Sotto

sotto voce — in a quiet voice, so only the person beside you hears.

A silent copilot for your Google Meet and Microsoft Teams calls, inside the AI agent you already use.

Sotto follows your meeting as it happens: what people say, and whatever they put on screen. While the conversation is still going, your agent sends you short private cues: the question worth asking now, the objection that's coming, the fact from your own work that settles the point.

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What you see

Sotto speaks up only when it has something useful, and stays quiet the rest of the time.

Why Sotto

• It knows your work. Sotto runs inside your AI agent, so mid-meeting it can look through the projects, documents and notes your agent can see.
• Nothing joins the call. There's no bot in the participant list, and nothing is said or posted in the meeting.
• It sees the screen. When someone presents, your agent can read the slide, dashboard or document they're showing.
• Free and light. It uses the meeting's own captions, so there's no transcription service, no API key and no account to create. It barely uses your computer.
• Any caption language. It works in every language Google Meet or Teams can caption.

What you need

• One of these AI agents: Claude Code, Codex CLI or Antigravity
• Google Meet or Microsoft Teams, joined in Google Chrome or Microsoft Edge (not the Teams app), with the meeting's interface in English

Install

You only do this once.

1. Install uv

Sotto needs uv, a small free tool that runs its background helper. Skip this step if you already have it.

Windows (PowerShell):

powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

macOS or Linux:

curl -LsSf https://astral.sh/uv/install.sh | sh

2. Add the browser extension

1. Download the Sotto extension.
2. Unzip it into a folder you'll keep, such as Documents\Sotto extension. The browser loads Sotto from that folder, so don't delete it.
3. Open chrome://extensions (or edge://extensions), switch on Developer mode, click Load unpacked, and choose the folder you unzipped.

Do this in the browser profile you join meetings from.

3. Add Sotto to your agent

Claude Code

In a terminal:

claude plugin marketplace add amn-max/Sotto
claude plugin install sotto@sotto

Or inside Claude Code: /plugin marketplace add amn-max/Sotto, then /plugin install sotto@sotto.

Codex CLI

codex plugin marketplace add amn-max/Sotto
codex plugin add sotto@sotto

Antigravity

App or IDE:

1. Download the Sotto plugin.
2. Unzip it into your Antigravity plugins folder: ~/.gemini/config/plugins (on Windows, %USERPROFILE%\.gemini\config\plugins).
3. Restart Antigravity.

CLI:

agy plugin install https://github.com/amn-max/Sotto

The first time Antigravity asks to run a Sotto tool, choose to always allow it, so it can keep listening without stopping to ask.

Then start a new session in your agent.

Use it

1. Join your meeting in the browser and turn on captions. In Google Meet, press c or click CC; in Teams, open More and turn on Captions. Only you see them.

2. Start Sotto with /sotto ($sotto in Codex; in the Antigravity IDE, ask the agent to start Sotto), and say what the meeting is about and what you want from it:

   /sotto Vendor call on telephony pricing. I want under 40 paise a minute and a 30-day pilot.
   

   The description is optional; with just /sotto, it works out the context as the meeting goes. The more you tell it (your goal, who's on the other side, what to watch for), the sharper the cues.

3. Ask it anything along the way. Type into the same chat: "what should I ask about SLAs?", "is that number right?", "summarise the last five minutes". It answers, then goes back to listening.

4. Finish. Say "stop", or just leave the call. Sotto writes a wrap-up of decisions, action items with owners, and open questions.

Tips

• Keep your agent on a second screen, or beside the meeting window.
• When you share your screen, share a tab or a window rather than the whole screen, so your cues stay private.
• A faster model makes cues arrive sooner.

Languages

Sotto works in any language your meeting can caption. Captions follow one language at a time, so set them to the language the meeting is in:

• Google Meet (supported languages): open ⋮ More options → Settings → Captions, and choose the language under Language of the meeting.
• Teams: open the captions settings and change the spoken language.

Your agent writes its cues in the language you write to it in, whatever language the captions are in.

Updating

When a new version is out, Sotto tells you in your agent the next time you start it, with a link. To update:

• Browser extension: download the zip again, unzip it over your existing Sotto folder, then click the reload button on Sotto's card in chrome://extensions.
• Claude Code: claude plugin marketplace update sotto, then claude plugin update sotto@sotto. To have Claude Code update Sotto by itself, open /plugin, go to Marketplaces, choose sotto and turn on Enable auto-update.
• Codex CLI: codex plugin marketplace upgrade, then codex plugin add sotto@sotto.
• Antigravity: download and unzip the plugin again over the old one (or rerun agy plugin install in the CLI), then restart Antigravity.

Troubleshooting

What you see	What to do
"Meeting tab not connected"	Check that Sotto is switched on in chrome://extensions, then refresh the meeting tab.
"Captions are OFF"	In Google Meet, press c or click CC. In Teams, open More and turn on Captions.
Cues don't match what's being said	Check the caption language (see Languages).
/sotto isn't recognised	Start a new session in your agent after installing.
"Port 47823 is held by another program"	Another app is using the port Sotto needs. Close that app, then start Sotto again.

Privacy

• Stays on your computer: the meeting transcript and screen snapshots, saved in a Sotto folder in your home folder. Delete them whenever you like.
• Goes to your agent's provider: the caption text, and any snapshots your agent looks at, go to the company behind your agent (Anthropic, OpenAI or Google) as part of your normal session with them.
• Version check: once a day, when you start Sotto, it asks GitHub for the latest version number. Nothing about you or your meetings is sent. To turn it off, set the environment variable SOTTO_UPDATE_CHECK=0.
• Goes nowhere else: there's no Sotto server, no account and no tracking.
• Other people in the meeting aren't notified. Whether and how to tell them is up to you. Follow your organisation's rules, especially for calls with customers.

Limits

• Captions aren't perfect. Names, numbers, and speech in a language other than the caption language can come through garbled. Your agent reads past a lot of it from context, but it can't hear the audio.

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Building on Sotto or changing it? See CONTRIBUTING.md.