Summary

The Antigravity CLI (agy) reads a project-root AGENTS.md as its canonical rules/context file and honors .geminiignore for file-discovery exclusion, but rulesync's antigravity-cli target writes rules only to GEMINI.md and has no ignore adapter at all.

Recent Releases

• Antigravity CLI CHANGELOG: https://github.com/google-antigravity/antigravity-cli/blob/main/CHANGELOG.md (v1.0.0 → v1.0.7)
• Migration guide: https://antigravity.google/docs/gcli-migration
• Rules & workflows docs: https://antigravity.google/docs/rules-workflows

Gaps

• rules — CLI reads AGENTS.md at root; rulesync writes only GEMINI.md. The agy CLI parses both GEMINI.md and AGENTS.md as workspace-root context/rules files (and ~/.gemini/GEMINI.md globally). The official migration guide and hands-on guides describe AGENTS.md as the root instruction file for the CLI. src/features/rules/antigravity-cli-rule.ts writes the root rule only to GEMINI.md (project + ~/.gemini/GEMINI.md global); non-root to .agents/rules/*.md. No AGENTS.md emission. rulesync side: rules — no root AGENTS.md output.

• ignore — no antigravity-cli ignore adapter. The Antigravity agent honors .geminiignore for file-discovery exclusion (inherited from the Gemini CLI lineage). No antigravity* adapter exists under src/features/ignore/; the dry-run reports Target 'antigravity-cli' does not support the feature 'ignore'. A geminicli-ignore.ts exists but is not wired to the antigravity targets. (Secondary: v1.0.4 added a rules.json discovery filter — lower priority, confirm schema before generating.) rulesync side: ignore unsupported.

Proposed Follow-up

• Decide the CLI's canonical root file (AGENTS.md cross-tool standard vs GEMINI.md); consider switching antigravity-cli root output to AGENTS.md or emitting both. Verify against the live agy context loading before changing the default.
• Add an antigravity-cli ignore adapter emitting .geminiignore (likely reusable from geminicli-ignore.ts). Track rules.json as a secondary surface pending an official schema.

References

• https://github.com/google-antigravity/antigravity-cli/blob/main/CHANGELOG.md — v1.0.4 rules.json filter, v1.0.5 mcp url support.
• https://antigravity.google/docs/gcli-migration — AGENTS.md as CLI root instruction file.
• Agent tool list_dir ignores .geminiignore rules in Antigravity google-gemini/gemini-cli#14546 — .geminiignore behavior in the Gemini/Antigravity lineage.