Your agent session is a place, not a private box.

AI agents now run for hours or days — but the session still belongs to one laptop. Costeer puts any coding agent in a live room your whole team can join: watch it work, steer it, hand it off — with real permissions, and a permanent record of who did what.

Or just write to us: benblack211@gmail.com

What Costeer does

Rooms, roles, and a record

Watch — the session is shared by default

Everyone in the room sees the same live stream: the agent's plan, its tool calls, the diff taking shape. Joining is a link, like a Figma file.

Steer — without grabbing the keyboard

One person drives. Teammates queue suggestions the driver sends with a click. Dangerous actions route to whoever's account is allowed to approve them — a viewer can't green-light a shell command.

Hand off — sessions outlive laptops

Pass the wheel across accounts and close your lid; the session keeps its full context. Every room persists as a searchable record — who steered, who approved what, on which branch.

Why now

Agent sessions crossed the handoff threshold

30–52 hoursreal production coding-agent runs in 2026 — a session that long can't belong to one person
~105 daysdoubling time of autonomous task length (METR) — the sessions only get longer
Read-onlythe best any agent vendor offers a teammate today is a transcript
“Think Google Docs / VS Code Live Share, but for a Claude Code chat.”
— feature request on the Claude Code tracker, May 2026. Unanswered. We built it.

Early access

We're onboarding the first teams now

If your team runs long agent sessions — background refactors, overnight migrations, on-call handoffs — we want you in the beta. Request access and tell us what your agents are doing.