First-class Google Antigravity host (#62) - #102
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Antigravity reads AGENTS.md (so graft partially worked) but its MCP registry and
skills live in dedicated paths graft never wrote to. This adds a first-class
`antigravity` host:
- registry.ts: `antigravity` host writes the AGENTS.md instruction section;
detects on Antigravity-specific markers (~/.gemini/config, ~/.gemini/
antigravity-cli, or a workspace .agents/), NOT bare ~/.gemini (which is Gemini
CLI) so a plain Gemini user isn't dragged in.
- mcp-config.ts: registers the graft MCP server in Antigravity's own global
registry, ~/.gemini/config/mcp_config.json ({command,args} under mcpServers),
separate from Gemini CLI's .gemini/settings.json.
- antigravity.ts: places the shared skill in ~/.gemini/skills/graft/SKILL.md.
- init.ts/plan.ts: wire the skill into the install + dry-run plan; --no-global
suppresses the two global writes (MCP + skill), keeping AGENTS.md.
`graft init --agents antigravity` now lands every piece in the right spot. 633
tests (+4; host-list and all-hosts convergence updated for the shared AGENTS.md).
Hooks (PreInvocation retrieval / PostToolUse sync) are a deliberate follow-up:
Antigravity's injectSteps output format isn't authoritatively documented and a
malformed PreToolUse can deny every tool call (manaflow-ai/cmux#5358), so writing
hooks.json to a user's global config needs a real-Antigravity check first.
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Closes #62.
What
Antigravity already reads
AGENTS.md, so graft partially worked, but its MCP registry and skills live in dedicated paths graft never wrote to. This adds a first-classantigravityhost sograft init --agents antigravitylands every piece in the right spot.antigravityhost writes theAGENTS.mdinstruction section. It detects on Antigravity-specific markers (~/.gemini/config,~/.gemini/antigravity-cli, or a workspace.agents/), NOT bare~/.gemini(which is Gemini CLI), so a plain Gemini-CLI user is not auto-selected.~/.gemini/config/mcp_config.json(standard{command, args}undermcpServers), separate from Gemini CLI's.gemini/settings.json. This is the gap Feature request: Add first-class support for Google Antigravity (AGY) #62 reported.~/.gemini/skills/graft/SKILL.md.--dry-runplan.--no-globalsuppresses the two global writes (MCP + skill) while keepingAGENTS.md.Verified
graft init --agents antigravityend to end: AGENTS.md written, MCP at the correct global path, skill placed, all idempotent. Detection keys off Antigravity markers only. 633 tests (+4 Antigravity; host-list and all-hosts convergence updated for the shared AGENTS.md).Deliberately deferred: hooks
Antigravity exposes a Codex-style hook model (
PreToolUse,PostToolUse,PreInvocation,PostInvocation,Stopvia~/.gemini/config/hooks.json), which could carry graft's retrieval / sync hooks. I am NOT shipping those yet, for two reasons:injectStepsoutput format forPreInvocationcontext injection is not authoritatively documented.PreToolUsehook can deny every tool call and make Antigravity unusable (Antigravity (agy): injected PreToolUse hook denies every tool call (invalid_args) — agy unusable in cmux manaflow-ai/cmux#5358).Writing an unverified
hooks.jsonto a user's global config is worse than not writing it, so hooks are a fast-follow pending a check against a real Antigravity install.