feat(antigravity): add ZERO-294 adapter

Makefile

@@ -17,7 +17,8 @@ MANIFESTS := \
 	plugins/zero/.claude-plugin/plugin.json \
 	plugins/zero/.codex-plugin/plugin.json \
 	plugins/zero/.factory-plugin/plugin.json \
-	plugins/zero-gemini/gemini-extension.json
+	plugins/zero-gemini/gemini-extension.json \
+	plugins/zero-antigravity/plugin.json
 
 # The manifest read for the current version (all of MANIFESTS stay in lockstep).
 VERSION_SOURCE := plugins/zero/.claude-plugin/plugin.json

README.md

@@ -28,6 +28,7 @@ installation, use the guides below. Pick your agent:
 - **[Codex (CLI)](guides/codex.md)**
 - **[Codex app](guides/codex-app.md)**
 - **[Droid](guides/droid.md)**
+- **[Google Antigravity CLI](guides/antigravity.md)**
 - **[Gemini CLI](guides/gemini-cli.md)**
 - **Anything else** — the standalone installer works in any agent with a
   shell (and for humans at a terminal):
@@ -72,7 +73,9 @@ plugins/zero/                     # the shared plugin: skill + hooks (+ Claude's
   ├── .claude-plugin/             # Claude Code manifest
   ├── .codex-plugin/              # Codex manifest
   └── .factory-plugin/            # Droid manifest
+plugins/zero-antigravity/         # thin Antigravity overlay (manifest + hook/MCP/rule wiring)
 plugins/zero-gemini/              # thin Gemini-only overlay (manifest + hook wiring)
+scripts/build-antigravity.sh      # assembles the installable Antigravity plugin into dist/
 scripts/build-gemini.sh           # assembles the installable Gemini extension into dist/
 guides/                           # per-host install guides + the agent install runbook
 ```
@@ -83,5 +86,6 @@ mechanics — live in the per-host guides.
 ## Status
 
 This repo is built up iteratively, one carefully reviewed PR at a time. Today
-it ships the **Claude Code**, **Codex**, **Droid**, and **Gemini CLI** plugins;
-additional hosts (Cursor) will land in subsequent PRs.
+it ships the **Claude Code**, **Codex**, **Droid**, **Google Antigravity CLI**,
+and **Gemini CLI** plugins; additional hosts (Cursor) will land in subsequent
+PRs.

guides/antigravity.md

@@ -0,0 +1,38 @@
+# Zero for Google Antigravity CLI
+
+How to install Zero in Google Antigravity CLI and keep it up to date.
+
+## Install
+
+### Install Antigravity CLI
+
+```bash
+curl -fsSL https://antigravity.google/cli/install.sh | bash
+```
+
+Open a fresh terminal so `agy` is on PATH.
+
+### Install Zero
+
+From a checkout of `officialzeroxyz/zero-plugins`:
+
+```bash
+scripts/build-antigravity.sh
+agy plugin install dist/zero-antigravity
+```
+
+That's it — Zero sets itself up automatically. Start Antigravity CLI in your
+project with `agy`, then ask: *"Help me set up and test Zero."* It walks you
+through signing in.
+
+## Staying up to date
+
+- The Zero runner updates before Antigravity model invocations.
+- To update the plugin itself from a fresh checkout of this repo, rebuild and
+  reinstall it:
+
+  ```bash
+  git pull
+  scripts/build-antigravity.sh
+  agy plugin install dist/zero-antigravity
+  ```

plugins/zero-antigravity/hooks.json

@@ -0,0 +1,25 @@
+{
+  "zero-runner": {
+    "PreInvocation": [
+      {
+        "type": "command",
+        "command": "bash ./hooks/ensure-runner-antigravity.sh",
+        "timeout": 120
+      }
+    ]
+  },
+  "zero-auto-approve": {
+    "PreToolUse": [
+      {
+        "matcher": "run_command",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash ./hooks/auto-approve-zero-antigravity.sh",
+            "timeout": 5
+          }
+        ]
+      }
+    ]
+  }
+}

plugins/zero-antigravity/hooks/auto-approve-zero-antigravity.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+#
+# Antigravity PreToolUse hook.
+#
+# Auto-approves safe, read-only Zero commands in Antigravity's camelCase hook
+# contract. Paid calls (`zero fetch`) and wallet/funding commands are left for
+# normal review.
+
+set -euo pipefail
+
+input="$(cat)"
+
+case "$input" in
+  *'"name":"run_command"'* | *'"name": "run_command"'*) ;;
+  *) exit 0 ;;
+esac
+
+after="${input#*\"CommandLine\":}"
+[ "$after" = "$input" ] && exit 0
+after="${after#"${after%%[![:space:]]*}"}"
+case "$after" in \"*) after="${after#\"}" ;; *) exit 0 ;; esac
+lead="${after%%\"*}"
+lead="${lead%\\}"
+
+lead="${lead//\\/}"
+lead="${lead//\'/}"
+IFS=' ' read -r -a toks <<<"$lead" || true
+
+idx=0
+while [ "$idx" -lt "${#toks[@]}" ]; do
+  case "${toks[$idx]}" in
+    [A-Za-z_]*=*) idx=$((idx + 1)) ;;
+    *) break ;;
+  esac
+done
+
+exe="${toks[$idx]:-}"
+sub="${toks[$((idx + 1))]:-}"
+base="${exe##*/}"
+
+case "$base" in
+  zero | zerocli) ;;
+  *) exit 0 ;;
+esac
+
+case "$sub" in
+  search | get | review | runs) ;;
+  config) case "$lead" in *--set*) exit 0 ;; esac ;;
+  init) ;;
+  *) exit 0 ;;
+esac
+
+cat <<'JSON'
+{"decision":"allow","reason":"Zero read-only operation auto-approved"}
+JSON

plugins/zero-antigravity/hooks/ensure-runner-antigravity.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+#
+# Antigravity PreInvocation hook.
+#
+# Antigravity does not have a SessionStart hook. Run the shared Zero runner
+# provisioner here, discard its Claude/Codex-shaped JSON, then emit the
+# Antigravity PreInvocation shape with a short reminder.
+
+set -euo pipefail
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+bash "$DIR/ensure-runner.sh" >/dev/null || true
+
+cat <<'JSON'
+{"injectSteps":[{"ephemeralMessage":"Zero is available for external paid capabilities. Use the zero skill for the search -> inspect -> call flow. Resolve the runner as zero on PATH, $ZERO_RUNNER, or ~/.zero/runtime/bin/zero; the Antigravity Zero plugin provisions ~/.zero/runtime/bin/zero before model invocations."}]}
+JSON

plugins/zero-antigravity/mcp_config.json

@@ -0,0 +1,7 @@
+{
+  "mcpServers": {
+    "zero": {
+      "serverUrl": "https://mcp.zero.xyz"
+    }
+  }
+}

plugins/zero-antigravity/plugin.json

@@ -0,0 +1,5 @@
+{
+  "name": "zero",
+  "version": "1.4.0",
+  "description": "Discover and call paid AI capabilities (x402 / MPP) with automatic, wallet-backed payment. Search a live index of external services — image/video/audio generation, web scraping, data enrichment, real-time data, messaging — then call them and pay per use. Bundles the 'zero' skill and the Zero MCP connector."
+}

plugins/zero-antigravity/rules/zero.md

@@ -0,0 +1,16 @@
+# Zero
+
+Zero is available in this Antigravity environment for paid external capabilities.
+Use it only when the requested outcome requires a capability outside the agent's
+native tools, such as image/video/audio generation, scraping, real-time data,
+messaging, or other external services.
+
+Prefer the `zero` CLI runner for the whole flow:
+
+1. `zero search "<task>"`
+2. `zero get <result>`
+3. `zero fetch <url> ... --max-pay <amount>`
+
+If `zero` is not on PATH, resolve it from `$ZERO_RUNNER` or
+`~/.zero/runtime/bin/zero`. The Zero plugin provisions that runtime before
+Antigravity model invocations.

plugins/zero-gemini/gemini-extension.json

@@ -1,6 +1,6 @@
 {
   "name": "zero",
-  "version": "1.3.3",
+  "version": "1.4.0",
   "description": "Discover and call paid AI capabilities (x402 / MPP) with automatic, wallet-backed payment. Search a live index of external services — image/video/audio generation, web scraping, data enrichment, real-time data, messaging — then call them and pay per use. Bundles the 'zero' skill and the Zero MCP connector.",
   "mcpServers": {
     "zero": {

plugins/zero/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "zero",
-  "version": "1.3.3",
+  "version": "1.4.0",
   "description": "Discover and call paid AI capabilities (x402 / MPP) with automatic, wallet-backed payment. Search a live index of external services — image/video/audio generation, web scraping, data enrichment, real-time data, messaging — then call them and pay per use. Bundles the 'zero' skill and the Zero MCP connector.",
   "author": { "name": "Zero", "url": "https://zero.xyz" },
   "homepage": "https://zero.xyz",

plugins/zero/.codex-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "zero",
-  "version": "1.3.3",
+  "version": "1.4.0",
   "description": "Discover and call paid AI capabilities (x402 / MPP) with automatic, wallet-backed payment. Search a live index of external services — image/video/audio generation, web scraping, data enrichment, real-time data, messaging — then call them and pay per use. Bundles the 'zero' skill.",
   "author": { "name": "Zero", "url": "https://zero.xyz" },
   "homepage": "https://zero.xyz",

plugins/zero/.factory-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "zero",
-  "version": "1.3.3",
+  "version": "1.4.0",
   "description": "Discover and call paid AI capabilities (x402 / MPP) with automatic, wallet-backed payment. Search a live index of external services — image/video/audio generation, web scraping, data enrichment, real-time data, messaging — then call them and pay per use. Bundles the 'zero' skill and the Zero MCP connector.",
   "author": { "name": "Zero", "url": "https://zero.xyz" },
   "homepage": "https://zero.xyz",

scripts/build-antigravity.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+#
+# Assemble the Antigravity plugin into dist/zero-antigravity/.
+#
+# Antigravity consumes a plugin directory with plugin.json at the root. The
+# source overlay in plugins/zero-antigravity/ contains only Antigravity-specific
+# manifests, hook declarations, and hook adapters; shared Zero skill and runner
+# scripts are copied from plugins/zero/ at build time.
+
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+SHARED="$ROOT/plugins/zero"
+OVERLAY="$ROOT/plugins/zero-antigravity"
+OUT="$ROOT/dist/zero-antigravity"
+
+TARBALL=""
+if [ "${1:-}" = "--tar" ]; then
+  TARBALL="${2:?--tar requires an output path}"
+fi
+
+for f in \
+  "$OVERLAY/plugin.json" \
+  "$OVERLAY/mcp_config.json" \
+  "$OVERLAY/hooks.json" \
+  "$OVERLAY/hooks/ensure-runner-antigravity.sh" \
+  "$OVERLAY/hooks/auto-approve-zero-antigravity.sh" \
+  "$OVERLAY/rules/zero.md" \
+  "$SHARED/hooks/ensure-runner.sh" \
+  "$SHARED/skills/zero/SKILL.md"; do
+  [ -f "$f" ] || { echo "build-antigravity: missing required input: $f" >&2; exit 1; }
+done
+
+rm -rf "$OUT"
+mkdir -p "$OUT/hooks"
+
+cp "$OVERLAY/plugin.json" "$OUT/plugin.json"
+cp "$OVERLAY/mcp_config.json" "$OUT/mcp_config.json"
+cp "$OVERLAY/hooks.json" "$OUT/hooks.json"
+cp "$OVERLAY/hooks/ensure-runner-antigravity.sh" "$OUT/hooks/ensure-runner-antigravity.sh"
+cp "$OVERLAY/hooks/auto-approve-zero-antigravity.sh" "$OUT/hooks/auto-approve-zero-antigravity.sh"
+cp "$SHARED/hooks/ensure-runner.sh" "$OUT/hooks/ensure-runner.sh"
+cp -R "$OVERLAY/rules" "$OUT/rules"
+cp -R "$SHARED/skills" "$OUT/skills"
+chmod +x "$OUT/hooks/ensure-runner-antigravity.sh" "$OUT/hooks/auto-approve-zero-antigravity.sh" "$OUT/hooks/ensure-runner.sh"
+
+echo "build-antigravity: assembled $OUT"
+find "$OUT" -type f | sed "s#^$ROOT/##" | sort
+
+if [ -n "$TARBALL" ]; then
+  mkdir -p "$(dirname "$TARBALL")"
+  tar -czf "$TARBALL" -C "$OUT" .
+  echo "build-antigravity: wrote $TARBALL"
+fi