feat: add gemini install target

.gemini/GEMINI.md

@@ -0,0 +1,48 @@
+# ECC for Gemini CLI
+
+This file provides Gemini CLI with the baseline ECC workflow, review standards, and security checks for repositories that install the Gemini target.
+
+## Overview
+
+Everything Claude Code (ECC) is a cross-harness coding system with 36 specialized agents, 142 skills, and 68 commands.
+
+Gemini support is currently focused on a strong project-local instruction layer via `.gemini/GEMINI.md`, plus the shared MCP catalog and package-manager setup assets shipped by the installer.
+
+## Core Workflow
+
+1. Plan before editing large features.
+2. Prefer test-first changes for bug fixes and new functionality.
+3. Review for security before shipping.
+4. Keep changes self-contained, readable, and easy to revert.
+
+## Coding Standards
+
+- Prefer immutable updates over in-place mutation.
+- Keep functions small and files focused.
+- Validate user input at boundaries.
+- Never hardcode secrets.
+- Fail loudly with clear error messages instead of silently swallowing problems.
+
+## Security Checklist
+
+Before any commit:
+
+- No hardcoded API keys, passwords, or tokens
+- All external input validated
+- Parameterized queries for database writes
+- Sanitized HTML output where applicable
+- Authz/authn checked for sensitive paths
+- Error messages scrubbed of sensitive internals
+
+## Delivery Standards
+
+- Use conventional commits: `feat`, `fix`, `refactor`, `docs`, `test`, `chore`, `perf`, `ci`
+- Run targeted verification for touched areas before shipping
+- Prefer contained local implementations over adding new third-party runtime dependencies
+
+## ECC Areas To Reuse
+
+- `AGENTS.md` for repo-wide operating rules
+- `skills/` for deep workflow guidance
+- `commands/` for slash-command patterns worth adapting into prompts/macros
+- `mcp-configs/` for shared connector baselines

README.md

@@ -187,6 +187,7 @@ npm install        # or: pnpm install | yarn install | bun install
 # ./install.sh typescript python golang swift php
 # ./install.sh --target cursor typescript
 # ./install.sh --target antigravity typescript
+# ./install.sh --target gemini --profile full
 ```
 
 ```powershell
@@ -200,6 +201,7 @@ npm install        # or: pnpm install | yarn install | bun install
 # .\install.ps1 typescript python golang swift php
 # .\install.ps1 --target cursor typescript
 # .\install.ps1 --target antigravity typescript
+# .\install.ps1 --target gemini --profile full
 
 # npm-installed compatibility entrypoint also works cross-platform
 npx ecc-install typescript
@@ -885,6 +887,7 @@ Each component is fully independent.
 
 Yes. ECC is cross-platform:
 - **Cursor**: Pre-translated configs in `.cursor/`. See [Cursor IDE Support](#cursor-ide-support).
+- **Gemini CLI**: Experimental project-local support via `.gemini/GEMINI.md` and shared installer plumbing.
 - **OpenCode**: Full plugin support in `.opencode/`. See [OpenCode Support](#-opencode-support).
 - **Codex**: First-class support for both macOS app and CLI, with adapter drift guards and SessionStart fallback. See PR [#257](https://github.com/affaan-m/everything-claude-code/pull/257).
 - **Antigravity**: Tightly integrated setup for workflows, skills, and flattened rules in `.agent/`. See [Antigravity Guide](docs/ANTIGRAVITY-GUIDE.md).

manifests/install-modules.json

@@ -88,6 +88,7 @@
         ".claude-plugin",
         ".codex",
         ".cursor",
+        ".gemini",
         ".opencode",
         "mcp-configs",
         "scripts/setup-package-manager.js"
@@ -97,6 +98,7 @@
         "cursor",
         "antigravity",
         "codex",
+        "gemini",
         "opencode",
         "codebuddy"
       ],

schemas/ecc-install-config.schema.json

@@ -22,6 +22,7 @@
         "cursor",
         "antigravity",
         "codex",
+        "gemini",
         "opencode",
         "codebuddy"
       ]

scripts/lib/install-manifests.js

@@ -4,7 +4,7 @@ const path = require('path');
 const { planInstallTargetScaffold } = require('./install-targets/registry');
 
 const DEFAULT_REPO_ROOT = path.join(__dirname, '../..');
-const SUPPORTED_INSTALL_TARGETS = ['claude', 'cursor', 'antigravity', 'codex', 'opencode', 'codebuddy'];
+const SUPPORTED_INSTALL_TARGETS = ['claude', 'cursor', 'antigravity', 'codex', 'gemini', 'opencode', 'codebuddy'];
 const COMPONENT_FAMILY_PREFIXES = {
   baseline: 'baseline:',
   language: 'lang:',

scripts/lib/install-targets/gemini-project.js

@@ -0,0 +1,10 @@
+const { createInstallTargetAdapter } = require('./helpers');
+
+module.exports = createInstallTargetAdapter({
+  id: 'gemini-project',
+  target: 'gemini',
+  kind: 'project',
+  rootSegments: ['.gemini'],
+  installStatePathSegments: ['ecc-install-state.json'],
+  nativeRootRelativePath: '.gemini',
+});

scripts/lib/install-targets/registry.js

@@ -3,6 +3,7 @@ const claudeHome = require('./claude-home');
 const codebuddyProject = require('./codebuddy-project');
 const codexHome = require('./codex-home');
 const cursorProject = require('./cursor-project');
+const geminiProject = require('./gemini-project');
 const opencodeHome = require('./opencode-home');
 
 const ADAPTERS = Object.freeze([
@@ -10,6 +11,7 @@ const ADAPTERS = Object.freeze([
   cursorProject,
   antigravityProject,
   codexHome,
+  geminiProject,
   opencodeHome,
   codebuddyProject,
 ]);

tests/lib/install-targets.test.js

@@ -40,6 +40,7 @@ function runTests() {
     assert.ok(targets.includes('cursor'), 'Should include cursor target');
     assert.ok(targets.includes('antigravity'), 'Should include antigravity target');
     assert.ok(targets.includes('codex'), 'Should include codex target');
+    assert.ok(targets.includes('gemini'), 'Should include gemini target');
     assert.ok(targets.includes('opencode'), 'Should include opencode target');
     assert.ok(targets.includes('codebuddy'), 'Should include codebuddy target');
   })) passed++; else failed++;
@@ -230,6 +231,19 @@ function runTests() {
     assert.strictEqual(statePath, path.join(projectRoot, '.codebuddy', 'ecc-install-state.json'));
   })) passed++; else failed++;
 
+  if (test('resolves gemini adapter root and install-state path from project root', () => {
+    const adapter = getInstallTargetAdapter('gemini');
+    const projectRoot = '/workspace/app';
+    const root = adapter.resolveRoot({ projectRoot });
+    const statePath = adapter.getInstallStatePath({ projectRoot });
+
+    assert.strictEqual(adapter.id, 'gemini-project');
+    assert.strictEqual(adapter.target, 'gemini');
+    assert.strictEqual(adapter.kind, 'project');
+    assert.strictEqual(root, path.join(projectRoot, '.gemini'));
+    assert.strictEqual(statePath, path.join(projectRoot, '.gemini', 'ecc-install-state.json'));
+  })) passed++; else failed++;
+
   if (test('codebuddy adapter supports lookup by target and adapter id', () => {
     const byTarget = getInstallTargetAdapter('codebuddy');
     const byId = getInstallTargetAdapter('codebuddy-project');