crickets runs on Claude Code and Antigravity, on all three OSes — this table shows how each component behaves per host.

Host	Status	Notes
Claude Code (Anthropic CLI / IDE)	✅ supported	the primary surface; CI-verified on every push
Antigravity 2.0 + the agy CLI	✅ supported	CI-verified; some hooks run observe-only (below)

Every customization declares supported_hosts: in its manifest, and the generator emits each plugin only for the hosts it supports. Destination paths per kind: Per-Host Paths.

Linux, macOS, and Windows (PowerShell 7+) are tested on every pull request (a plain push to main only runs a light syntax check) — the per-OS workflows, the aggregate badge, and the gate battery are in CI gates.

Claude Code supports every plugin fully; the Support column reflects Antigravity completeness.

Plugin	Support	Antigravity gaps
development-lifecycle	⚠️ Partial	the harness-context SessionStart hook is Claude-only
developer-safety	⚠️ Partial	kill-switch fires observe-only; steer doesn't fire at all; commit-on-stop is fully effective (below)
code-review	⚠️ Partial	the evidence-tracker hook is Claude-only
maintenance	✅ Supported	—
privacy	✅ Supported	—
wiki	⚠️ Partial	the slash commands + the wiki-author skill are Claude-only (why)
design	✅ Supported	—
github-projects	✅ Supported	—
obsidian-vault	⚠️ Partial	the conflict-merger-session-start hook is Claude-only (SessionStart)
conventions	✅ Supported	—
tokens	⚠️ Partial	status-line-meter is Claude Code only (no status-line surface on Antigravity); token-audit's /token-audit command is Claude-only
diagnostics	✅ Supported	—
research	✅ Supported	—

A hook can be emitted on a host without being effective there. Antigravity runs plugin hooks observe / side-effect-only — it fires them but ignores exit codes and never reads stdout. So a hook that vetoes a tool call or injects text is inert on Antigravity even though it runs.

Hook	Plugin	Claude Code	Antigravity	Why
commit-on-stop	developer-safety	✅ effective	✅ effective	pure side-effect (it commits) — no exit/stdout contract needed
kill-switch	developer-safety	✅ effective	⚠️ advisory only	vetoes via exit code; Antigravity ignores exit codes
steer	developer-safety	✅ effective	❌ does not fire	fires on UserPromptSubmit; the generator skips registering that event for Antigravity, so the hook never runs there at all
evidence-tracker	code-review	✅ effective	❌ Claude-only	needs the veto contract Antigravity lacks ([claude-code])
harness-context	development-lifecycle	✅ effective	❌ Claude-only	SessionStart — Antigravity has no SessionStart surface

Rule of thumb: side-effect-only hooks port to both hosts; any hook whose value depends on a veto (exit code) or an inject (stdout) is Claude-only-effective. The full catalog is in Hooks.

Authoring a host-portable hook? Resolve the workspace from stdin, not cwd — see Hooks.

The snippet kind is an instruction fragment. The generator emits it as an Antigravity rules/ file (<plugin>/rules/<name>.md) and drops it on Claude Code, which has no instruction-file primitive to land it in. So developer-safety's commit-no-coauthor + worktrees-operator-initiated conventions ship as Antigravity rules with no Claude-Code form. See Per-Host Paths.

Three Antigravity surfaces have no file-based authoring path, so crickets can't ship into them from the manifest model:

• Hooks — Antigravity hooks are Python decorators registered at agent creation; there's no hooks.json / .agents/hooks/ to target. (crickets' file-based hooks therefore run observe-only — above.)
• Scheduled tasks / triggers — Python registration patterns, no file-based config; crickets ships none.
• Multi-agent orchestration — operator-facing (start_subagent); no plugin-author surface for spawn policy.

Each is tracked, with its re-address trigger, in the canonical Antigravity limitations register.

• Gemini CLI — dropped in v0.9.0 (2026-05-17, "Gemini-CLI host removal"). Google replaced it with the Antigravity CLI (agy), which is supported; consumer Gemini CLI sunsets 2026-06-18. (agentm Foundations HLD — crickets split.)
• Codex — never had an adapter.

• Troubleshooting — when a host that should work stops working.
• Antigravity limitations — the host-gap register.
• Hooks — the full hook catalog.
• Per-Host Paths — destinations per kind, per host.
• Manifest Schema — the supported_hosts declaration.