Google Antigravity March 2026 Updates: Version 1.20, MCP Support, and More

TL;DR: Google Antigravity shipped 10+ updates from January to March 2026, going from v1.15 to v1.20.6. Key additions include MCP (Model Context Protocol) support for external integrations, terminal sandboxing on macOS for safer agent execution, AGENTS.md rules files for project-level agent configuration, and updated model support including Claude Sonnet 4.6 and Gemini 3.1 Pro.

Google Antigravity has been shipping rapidly since its November 2025 launch. Here's a comprehensive roundup of everything new from January through March 2026 (source: Google AI Developers Forum).

Latest Version: 1.20.6 (March 17, 2026)

Antigravity is now at version 1.20.6, with significant improvements across stability, features, and developer experience.

Major New Features

MCP (Model Context Protocol) Support

One of the most requested features, MCP support landed in early 2026. Model Context Protocol allows Antigravity agents to connect to external tools and services through standardized tool servers:

• GitHub: Manage PRs, issues, and code reviews directly from agents
• Databases: Schema-aware development with live database connections
• APIs: Connect to any third-party service through MCP servers
• Custom Tools: Build your own MCP servers for specialized workflows

This opens Antigravity to a vast ecosystem of integrations, making agents far more capable in real-world workflows.

Terminal Sandboxing (macOS)

Introduced in v1.15.6 (January 23, 2026), terminal sandboxing ensures that agent terminal commands run within a secure sandbox — preventing agents from modifying files outside the workspace. This is a critical safety feature for autonomous execution, giving developers more confidence when letting agents run terminal commands.

AGENTS.md Rules Files

Starting from v1.20.3 (March 5, 2026), Antigravity supports AGENTS.md rules files alongside the existing GEMINI.md format. This lets developers define project-specific instructions and constraints for AI agents, similar to how .editorconfig standardizes formatting across teams.

Example AGENTS.md usage:

# AGENTS.md
- Always use TypeScript strict mode
- Follow the existing project patterns for API routes
- Run tests before committing changes
- Never modify files in the /config directory without confirmation

Updated Model Support

Antigravity now supports the latest AI models:

| Model | Version | |-------|---------| | Gemini 3.1 Pro | Latest Google flagship | | Gemini 3 Flash | Fast iterations | | Claude Sonnet 4.6 | Anthropic's balanced model | | Claude Opus 4.6 | Anthropic's most capable | | GPT-OSS-120B | Open-source option |

Complete Version History (Jan–Mar 2026)

v1.15.6 — January 23, 2026

• Terminal sandboxing for macOS

v1.15.8 — January 24, 2026

• Performance enhancements for long conversation handling

v1.16.5 — February 3, 2026

• Bug fixes and performance improvements

v1.18.3 — February 19, 2026

• New settings screens for models and terminal integration
• Artifact download support
• Stability and UI fixes across platforms

v1.18.4 — February 21, 2026

• Windows auto-updater fix

v1.19.5 — February 26, 2026

• Browser stability improvements

v1.19.6 — February 26, 2026

• Formal remediation process for accounts suspended due to ToS violations

v1.20.3 — March 5, 2026

• AGENTS.md rules files support
• Stability and UI improvements

v1.20.5 — March 9, 2026

• Fixed color contrast in Agent Manager terminals
• Fixed cleaning up old SSH server instances
• Fixed token accounting bug that caused conversations to reach max limit prematurely

v1.20.6 — March 17, 2026

• Fixed an issue where rules and workflows (customizations) could not be created

Performance Benchmarks

Antigravity continues to demonstrate strong performance:

| Benchmark | Score | |-----------|-------| | SWE-bench Verified | 76.2% | | Terminal-Bench 2.0 | 54.2% (vs GPT-5.1's 47.6%) |

Pricing Update

Antigravity remains free during the public preview with generous Gemini 3 Pro rate limits. Anticipated pricing tiers:

• Individual — Free with limited rate limits
• Pro — ~$20/month with higher limits
• Enterprise — ~$40-60/user/month with SSO, data residency, and admin controls

What's Coming Next

Based on community discussions and Google's roadmap:

• Enterprise features — SSO, team management, admin controls
• Offline mode — Local model support for air-gapped environments
• Custom agents — Build and share your own specialized agents
• Paid tiers — Pro and Enterprise plans with higher rate limits

Frequently Asked Questions About the March 2026 Updates

What is the latest version of Google Antigravity?

As of March 21, 2026, the latest version is v1.20.6, released on March 17, 2026. It fixed an issue where rules and workflows (customizations) could not be created.

What is MCP support in Google Antigravity?

MCP (Model Context Protocol) is a standardized protocol that allows Antigravity's AI agents to connect to external tools and services. With MCP, agents can manage GitHub PRs, query databases, call third-party APIs, and use custom tool servers — extending their capabilities beyond just code editing.

What is AGENTS.md in Antigravity?

AGENTS.md is a project-level configuration file (introduced in v1.20.3) that lets developers define instructions and constraints for AI agents. It works alongside GEMINI.md and functions similarly to .editorconfig — standardizing agent behavior across team members.

Is Google Antigravity still free in 2026?

Yes. As of March 2026, Google Antigravity remains free during its public preview phase. Google has indicated future paid tiers (Pro at ~$20/month, Enterprise at ~$40-60/user/month) but has not announced a launch date for paid plans.

How often does Google update Antigravity?

Google has been updating Antigravity approximately every 1-2 weeks. From January to March 2026 alone, there were 10 version releases (v1.15.6 through v1.20.6).

Conclusion

The pace of Antigravity updates in early 2026 has been impressive. The addition of MCP support, terminal sandboxing, and AGENTS.md rules files shows Google's commitment to making Antigravity a production-ready tool. With the latest models (Gemini 3.1 Pro, Claude 4.6 family) and strong benchmark performance, Antigravity continues to push the boundaries of agent-first development.

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• What is Google Antigravity? Complete Guide
• Getting Started with Antigravity
• Antigravity Skills Guide
• Antigravity Browser Extension Guide

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Published: March 21, 2026