Integration guides ยท 2026-05-23

Antigravity CLI and Gemini CLI: migration guide for developers

Compare Antigravity CLI and Gemini CLI across MCP settings, skills files, API key handling, and safe coding-agent migration.

Diagram showing migration from Gemini CLI settings to Antigravity CLI agent harness, MCP servers, skills files, and the LLMTR model gateway.

Why migration needs its own checklist

Gemini CLI is a terminal agent that can use local tools and MCP servers for coding tasks. Antigravity CLI is part of Google's newer agent-first platform with a more unified harness and product family.

What should be moved

Start by inventorying user-level and project-level instructions, CLI settings, and connected MCP servers. Shared team rules belong in the repository; personal tokens and credentials should stay in secret-managed storage.

  • Project instructions such as AGENTS.md, GEMINI.md, or equivalent rule files.
  • Tool connections: MCP server list, transport type, and permission scope.
  • Model choice: Gemini models plus gateway access for alternatives.
  • Logging policy for prompts, shell output, and secret-bearing errors.

A safer migration order

Begin with read-only tasks. Repository summarization, test strategy extraction, and documentation review are lower-risk ways to validate the permission model. File writes, migrations, and deploy commands should require separate approval.

Multi-model comparison through LLMTR

A single model can mislead teams on cost or quality for CLI-agent tasks. Run the same bug fix or refactor on several models and compare patch correctness, tests, token use, and retry count.

Prepare a Gemini CLI workflow for Antigravity CLI

Inventory and test an existing CLI-agent setup before moving it to a new agent surface.

  1. List settings. Record project instructions, MCP servers, model preferences, and environment variables separately.
  2. Try a read-only task. Start with repository reading, summarization, or test planning before allowing edits.
  3. Stage write permissions. Add separate approval or policy for file writes, shell commands, and deployment actions.
  4. Compare cost metrics. Track tokens, latency, and retry cost with LLMTR usage records or an equivalent meter.

Frequently asked questions

Should every Gemini CLI user move to Antigravity CLI immediately?

No. First inventory MCP, instruction, and security dependencies, then validate migration on small tasks.

Where should a CLI agent API key be stored?

Do not store API keys in the repository. Use environment variables, a secret manager, or the provider's recommended secure storage.

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