[baveku]

Summary

Add Google Antigravity (apps/antigravity) as a plugin and UI extension host, rendering Mobile Dev in the Antigravity Auxiliary Pane (SIDECAR_UI_ENTRYPOINT_AUX_PANE) and sharing the session with the mobile-dev MCP server.

apps/antigravity/
├── .antigravity-plugin/plugin.json         # Antigravity plugin manifest
├── mcp_config.json                         # MCP server launch entry
├── hooks.json                              # SessionStart Node >= 22.19 check
├── plugin-host.json                        # Host build config (5 MiB limit, downloaded panel runtime)
├── server/
│   ├── index.ts                            # Entry split for bundle size limit
│   └── server.ts                           # Shared stdio server + browserPanel + agentDeviceTools
├── sidecars/
│   ├── device-panel/sidecar.json           # Aux Pane Web UI sidecar declaration
│   └── launch.mjs                          # Token-authenticated reverse proxy to the active browser panel
├── skills/mobile-dev/                      # Antigravity Mobile Dev skill and missing-tools reference
└── tooling/
    ├── build.mjs                           # Server bundle build
    └── publish-release.mjs                 # Publishes release/antigravity branch

sequenceDiagram
    participant IDE as Antigravity Aux Pane
    participant Sidecar as sidecars/launch.mjs
    participant Server as dist/server.mjs (MCP + Panel)
    IDE->>Sidecar: GET /?token=<ANTIGRAVITY_SIDECAR_UI_TOKEN>
    Sidecar->>Server: Proxy /, /mcp, /context (with x-sidecar-token)
    Server-->>Sidecar: Streamable HTTP MCP + Panel HTML
    Sidecar-->>IDE: Render Mobile Dev in Auxiliary Pane

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Key changes:

• apps/antigravity: Add plugin manifest, MCP config, SessionStart hook, Auxiliary Pane sidecar (device-panel), sidecar reverse proxy (launch.mjs) with TCP health check and automatic reconnect, build script, and release/antigravity branch publisher.
• packages/core/src/browser-panel.ts: Add optional onPage callback and instructions formatter to BrowserPanelOptions so a host can record the active loopback panel URL and customize opening instructions.
• packages/core/src/panel-runtime.ts: Support PLUGIN_DATA alongside CLAUDE_PLUGIN_DATA for the downloaded panel runtime directory.
• packages/core/src/physical-ios-bezel.ts: Resolve baguette/Baguette via panelRuntimePath when running from bundled .mjs files.
• packages/mcp-app/src/browser-panel.ts: Forward token query parameter as x-sidecar-token on /mcp and /context requests and reload once automatically when a sidecar session expires (404).
• tooling/smoke-plugin.mjs: Support hosts that declare mcpConfig and hooks paths in plugin-host.json.

Evidence

• Before: Antigravity had no native apps/antigravity host package or Auxiliary Pane sidecar integration.
• After: Unit tests, telemetry typecheck, release branch publishing tests, and agy plugin validate --strict pass; the extension installs from release/antigravity and renders the live device panel and performance profiler in the Antigravity Auxiliary Pane.

✔ publishing puts the Antigravity extension beside its marketplace on release/antigravity
✔ only a release build matching its tag is published
✔ browserPanel notifies onPage on startup and when a panel tool runs, with custom instructions
✔ the host's plugin data folder holds the runtime when it provides one
✔ tsc --noEmit (typecheck:telemetry)
✔ agy plugin validate --strict

Merge Danger

Door: Two-way

All Antigravity-specific files live in apps/antigravity, and changes in packages/core, packages/mcp-app, and tooling/smoke-plugin.mjs are additive and backward-compatible with existing Codex, Claude, Cursor, and Mac hosts.

Blast Radius: Low

Existing hosts keep their default behavior when onPage, instructions, PLUGIN_DATA, and ?token= are unset.

[vercel]

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