v0.1.88

🚀 Release Highlights — v0.1.88 (2026-05-20)

This is the first version of MassGen's Antigravity integration. v0.1.88 establishes the backend, workspace-local config isolation, MCP config translation, native hook adapter support, and runnable examples. We plan to complete the full integration in the next release.

🛰️ Antigravity CLI Backend

• New backend type (#1097): antigravity_cli wraps Google's agy binary as a MassGen backend
• Auth support: local mode can use existing Google OAuth state at ~/.gemini/google_accounts.json; GEMINI_API_KEY / GOOGLE_API_KEY are passed through when present
• Server-side model selection: agy selects the active model per Antigravity tier; MassGen accepts model for logging/registry consistency but does not pass a nonexistent --model flag

🧰 Workspace-Local Isolation

• Antigravity project state is routed through <workspace>/.antigravity via --gemini_dir
• MCP config and settings stay inside the MassGen workspace, avoiding mutation of the user's global ~/.gemini/ config
• .antigravity / .antigravitycli metadata directories are excluded from snapshot meaningful-content heuristics

🔌 MCP + Hook Integration

• MassGen MCP server entries are translated to Antigravity's mcp_config.json schema
• HTTP MCP servers emit serverUrl; stdio servers emit command / args / env
• AntigravityCLINativeHookAdapter reuses Gemini CLI hook behavior for Antigravity's compatible hook protocol

📦 New Example Configs

• massgen/configs/providers/antigravity/antigravity_cli_local.yaml — single Antigravity CLI agent
• massgen/configs/features/fast_iteration_gemini_antigravity.yaml — Gemini API + Antigravity CLI fast-iteration pair

🧪 Tests

• massgen/tests/test_antigravity_cli_backend.py covers binary discovery, command construction, workspace-local config, MCP schema, provider metadata, stdout/error streaming, workflow JSON envelopes, Docker/API-key constraints, native hook adapter wiring, and environment passthrough

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📖 Getting Started

• Quick Start Guide
• Install:

  pip install massgen==0.1.88
  curl -fsSL https://antigravity.google/cli/install.sh | bash

• Try It:

  uv run massgen --config massgen/configs/features/fast_iteration_gemini_antigravity.yaml "Create an svg of an AI agent coding."

What's Changed

• feat: add Antigravity CLI backend wrapping Google's agy binary by @ncrispino in #1097
• docs: docs for v0.1.88 by @Henry-811 in #1098
• feat: v0.1.88 by @Henry-811 in #1096

Full Changelog: v0.1.87...v0.1.88