Gemini CLI stopped serving consumer accounts (June 18): add Antigravity CLI (agy) backend

[Ark0N]

Reported on Reddit (r/selfhosted thread): the Gemini run mode spawns gemini-cli, which Google stopped serving for consumer accounts on June 18, 2026.

Background: at I/O 2026 Google announced it is consolidating its developer tooling under Antigravity and retiring the standalone Gemini CLI. Since June 18, gemini commands only work for enterprise customers with paid Gemini / Enterprise Agent Platform API keys; free and Google AI Pro/Ultra accounts were moved to the new Antigravity CLI (agy). Announcement: https://developers.googleblog.com/an-important-update-transitioning-gemini-cli-to-antigravity-cli/ Migration guide: https://antigravity.google/docs/cli/gcli-migration

So Codeman's Gemini mode is effectively enterprise-only today. The fix has two parts:

1. Add Antigravity CLI (agy) as a backend. It is still a real terminal agent (Go rewrite, keeps Agent Skills, Hooks, Subagents and Extensions), so it fits the existing external-CLI architecture. Rough scope, mirroring how Codex and Gemini were added (resolver pattern notes in docs/opencode-integration.md):

• CLI resolver (src/utils/antigravity-cli-resolver.ts): locate the agy binary across install methods, mirroring gemini-cli-resolver.
• SessionMode: add 'antigravity', gate Claude-specific behavior off via isExternalCliMode() so readiness falls back to output stabilization like the other external TUIs.
• Env prefix allowlist: ANTIGRAVITY_* in ALLOWED_ENV_PREFIXES (schemas.ts). Open question whether it also needs the broad GOOGLE_* namespace the Gemini mode got for Vertex auth, or whether agy's keyring-based auth makes that unnecessary. Start narrow.
• tmux-only spawn: secrets flow via socket-scoped tmux setenv, never on the spawn command line, same as the other external CLIs.
• Frontend: run-mode entry in session-ui.js (with the {success,data} envelope unwrap) plus the mode badge.

2. Decide what the existing gemini mode becomes. Keeping it makes sense for enterprise API-key users, but the UI should stop suggesting it works for everyone. Probably: keep the mode, mark it "enterprise API keys only" in the run dropdown/docs, and point consumer accounts at the Antigravity mode.

Work on this is starting now. If you hit this (Gemini button erroring on a regular Google account), that is why; agy support is the fix.

[Ark0N]

Implemented locally, pending release. antigravity is now a sixth SessionMode wired through the whole stack: agy resolver, spawn command (--dangerously-skip-permissions / --model / --conversation resume), tmux-only spawn, ANTIGRAVITY_* env allowlist, the multi-user bypass clamp, cron agent type, run-mode dropdown + "Run AG" button, tab badge, and a status endpoint (GET /api/antigravity/status).

Verified end to end on a live instance: quick-start with mode: "antigravity" spawns agy in a Codeman tmux session and the TUI (login picker) streams to the browser. 29 new/updated tests pass, typecheck and lint clean.

Not in this first cut: agy in the Docker agent image (no npm package; the curl installer needs its own Dockerfile step) and install.sh detection. The existing gemini mode stays for enterprise API keys and will get an "enterprise-only" hint in the UI docs.

Ships with the next release.

[Ark0N]

Shipped in 1.9.7 (aicodeman@1.9.7), commit 26cbbe0.

Antigravity (agy) is now a first-class session backend alongside Claude Code, shell, OpenCode, Codex and Gemini, using the same pluggable-resolver pattern:

• src/utils/antigravity-cli-resolver.ts resolves the CLI, and GET /api/antigravity/status reports availability plus the resolved path.
• ANTIGRAVITY_* is on the ALLOWED_ENV_PREFIXES allowlist in schemas.ts, so env overrides stay scoped to this CLI rather than being blanket-forwarded.
• Like the other external CLIs it requires tmux with no direct PTY fallback, because secrets are injected via socket-scoped tmux setenv and never appear on the spawn command line.
• UI: Run-dropdown entry, agent-type option, ag tab badge and toolbar colours. Remote and docker cases route through POST /api/quick-start and skip the local status probe.

Covered by test/antigravity-mode.test.ts plus run-mode-ui and system-routes tests.

Pick it from the Run dropdown (Terminal / Antigravity) or the agent-type selector.