---

description: Execute a multi-model implementation plan while preserving Claude as the only filesystem writer.

Execute - Multi-Model Collaborative Execution

Multi-model collaborative execution - Get prototype from plan → Claude refactors and implements → Multi-model audit and delivery.

Prerequisite: Requires the external ccg-workflow runtime, which is not part of the base ECC install. Initialize it with npx ccg-workflow to provision ~/.claude/bin/codeagent-wrapper and the ~/.claude/.ccg/prompts/* role files this command depends on. Without that runtime, this command will not run correctly.

$ARGUMENTS

---

Core Protocols

• Language Protocol: Use English when interacting with tools/models, communicate with user in their language
• Code Sovereignty: External models have zero filesystem write access, all modifications by Claude
• Dirty Prototype Refactoring: Treat Codex/Antigravity Unified Diff as "dirty prototype", must refactor to production-grade code
• Stop-Loss Mechanism: Do not proceed to next phase until current phase output is validated
• Prerequisite: Only execute after user explicitly replies "Y" to /ccg:plan output (if missing, must confirm first)

---

Multi-Model Call Specification

Call Syntax (parallel: use run_in_background: true):

# Resume session call (recommended) - Implementation Prototype
Bash({
  command: "~/.claude/bin/codeagent-wrapper {{LITE_MODE_FLAG}}--backend <codex|antigravity> resume <SESSION_ID> - \"$PWD\" <<'EOF'
ROLE_FILE: <role prompt path>
<TASK>
Requirement: <task description>
Context: <plan content + target files>
</TASK>
OUTPUT: Unified Diff Patch ONLY. Strictly prohibit any actual modifications.
EOF",
  run_in_background: true,
  timeout: 3600000,
  description: "Brief description"
})

# New session call - Implementation Prototype
Bash({
  command: "~/.claude/bin/codeagent-wrapper {{LITE_MODE_FLAG}}--backend <codex|antigravity> - \"$PWD\" <<'EOF'
ROLE_FILE: <role prompt path>
<TASK>
Requirement: <task description>
Context: <plan content + target files>
</TASK>
OUTPUT: Unified Diff Patch ONLY. Strictly prohibit any actual modifications.
EOF",
  run_in_background: true,
  timeout: 3600000,
  description: "Brief description"
})

Audit Call Syntax (Code Review / Audit):

Bash({
  command: "~/.claude/bin/codeagent-wrapper {{LITE_MODE_FLAG}}--backend <codex|antigravity> resume <SESSION_ID> - \"$PWD\" <<'EOF'
ROLE_FILE: <role prompt path>
<TASK>
Scope: Audit the final code changes.
Inputs:
- The applied patch (git diff / final unified diff)
- The touched files (relevant excerpts if needed)
Constraints:
- Do NOT modify any files.
- Do NOT output tool commands that assume filesystem access.
</TASK>
OUTPUT:
1) A prioritized list of issues (severity, file, rationale)
2) Concrete fixes; if code changes are needed, include a Unified Diff Patch in a fenced code block.
EOF",
  run_in_background: true,
  timeout: 3600000,
  description: "Brief description"
})

Model Parameter Notes:

• No extra model flag is needed for --backend antigravity or --backend codex; codeagent-wrapper picks each backend's default model.

Role Prompts:

Phase	Codex	Antigravity
Implementation	~/.claude/.ccg/prompts/codex/architect.md	~/.claude/.ccg/prompts/antigravity/frontend.md
Review	~/.claude/.ccg/prompts/codex/reviewer.md	~/.claude/.ccg/prompts/antigravity/reviewer.md

Session Reuse: If /ccg:plan provided SESSION_ID, use resume <SESSION_ID> to reuse context.

Wait for Background Tasks (max timeout 600000ms = 10 minutes):

TaskOutput({ task_id: "<task_id>", block: true, timeout: 600000 })

IMPORTANT:

• Must specify timeout: 600000, otherwise default 30 seconds will cause premature timeout
• If still incomplete after 10 minutes, continue polling with TaskOutput, NEVER kill the process
• If waiting is skipped due to timeout, MUST call AskUserQuestion to ask user whether to continue waiting or kill task

---

Execution Workflow

Execute Task: $ARGUMENTS

Phase 0: Read Plan

[Mode: Prepare]

1. Identify Input Type:

   • Plan file path (e.g., .claude/plan/xxx.md)
   • Direct task description

2. Read Plan Content:

   • If plan file path provided, read and parse
   • Extract: task type, implementation steps, key files, SESSION_ID

3. Pre-Execution Confirmation:

   • If input is "direct task description" or plan missing SESSION_ID / key files: confirm with user first
   • If cannot confirm user replied "Y" to plan: must confirm again before proceeding

4. Task Type Routing:

   Task Type	Detection	Route
   Frontend	Pages, components, UI, styles, layout	Antigravity
   Backend	API, interfaces, database, logic, algorithms	Codex
   Fullstack	Contains both frontend and backend	Codex ∥ Antigravity parallel

---

Phase 1: Quick Context Retrieval

[Mode: Retrieval]

If ace-tool MCP is available, use it for quick context retrieval:

Based on "Key Files" list in plan, call mcp__ace-tool__search_context:

mcp__ace-tool__search_context({
  query: "<semantic query based on plan content, including key files, modules, function names>",
  project_root_path: "$PWD"
})

Retrieval Strategy:

• Extract target paths from plan's "Key Files" table
• Build semantic query covering: entry files, dependency modules, related type definitions
• If results insufficient, add 1-2 recursive retrievals

If ace-tool MCP is NOT available, use Claude Code built-in tools as fallback:

1. Glob: Find target files from plan's "Key Files" table (e.g., Glob("src/components/**/*.tsx"))
2. Grep: Search for key symbols, function names, type definitions across the codebase
3. Read: Read the discovered files to gather complete context
4. Task (Explore agent): For broader exploration, use Task with subagent_type: "Explore"

After Retrieval:

• Organize retrieved code snippets
• Confirm complete context for implementation
• Proceed to Phase 3

---

Phase 3: Prototype Acquisition

[Mode: Prototype]

Route Based on Task Type:

Route A: Frontend/UI/Styles → Antigravity

Limit: Context < 32k tokens

1. Call Antigravity (use ~/.claude/.ccg/prompts/antigravity/frontend.md)
2. Input: Plan content + retrieved context + target files
3. OUTPUT: Unified Diff Patch ONLY. Strictly prohibit any actual modifications.
4. Antigravity is frontend design authority, its CSS/React/Vue prototype is the final visual baseline
5. WARNING: Ignore Antigravity's backend logic suggestions
6. If plan contains ANTIGRAVITY_SESSION: prefer resume <ANTIGRAVITY_SESSION>

Route B: Backend/Logic/Algorithms → Codex

1. Call Codex (use ~/.claude/.ccg/prompts/codex/architect.md)
2. Input: Plan content + retrieved context + target files
3. OUTPUT: Unified Diff Patch ONLY. Strictly prohibit any actual modifications.
4. Codex is backend logic authority, leverage its logical reasoning and debug capabilities
5. If plan contains CODEX_SESSION: prefer resume <CODEX_SESSION>

Route C: Fullstack → Parallel Calls

1. Parallel Calls (run_in_background: true):
   • Antigravity: Handle frontend part
   • Codex: Handle backend part
2. Wait for both models' complete results with TaskOutput
3. Each uses corresponding SESSION_ID from plan for resume (create new session if missing)

Follow the IMPORTANT instructions in Multi-Model Call Specification above

---

Phase 4: Code Implementation

[Mode: Implement]

Claude as Code Sovereign executes the following steps:

1. Read Diff: Parse Unified Diff Patch returned by Codex/Antigravity

2. Mental Sandbox:

   • Simulate applying Diff to target files
   • Check logical consistency
   • Identify potential conflicts or side effects

3. Refactor and Clean:

   • Refactor "dirty prototype" to highly readable, maintainable, enterprise-grade code
   • Remove redundant code
   • Ensure compliance with project's existing code standards
   • Do not generate comments/docs unless necessary, code should be self-explanatory

4. Minimal Scope:

   • Changes limited to requirement scope only
   • Mandatory review for side effects
   • Make targeted corrections

5. Apply Changes:

   • Use Edit/Write tools to execute actual modifications
   • Only modify necessary code, never affect user's other existing functionality

6. Self-Verification (strongly recommended):

   • Run project's existing lint / typecheck / tests (prioritize minimal related scope)
   • If failed: fix regressions first, then proceed to Phase 5

---

Phase 5: Audit and Delivery

[Mode: Audit]

5.1 Automatic Audit

After changes take effect, MUST immediately parallel call Codex and Antigravity for Code Review:

1. Codex Review (run_in_background: true):

   • ROLE_FILE: ~/.claude/.ccg/prompts/codex/reviewer.md
   • Input: Changed Diff + target files
   • Focus: Security, performance, error handling, logic correctness

2. Antigravity Review (run_in_background: true):

   • ROLE_FILE: ~/.claude/.ccg/prompts/antigravity/reviewer.md
   • Input: Changed Diff + target files
   • Focus: Accessibility, design consistency, user experience

Wait for both models' complete review results with TaskOutput. Prefer reusing Phase 3 sessions (resume <SESSION_ID>) for context consistency.

5.2 Integrate and Fix

1. Synthesize Codex + Antigravity review feedback
2. Weigh by trust rules: Backend follows Codex, Frontend follows Antigravity
3. Execute necessary fixes
4. Repeat Phase 5.1 as needed (until risk is acceptable)

5.3 Delivery Confirmation

After audit passes, report to user:

## Execution Complete

### Change Summary
| File | Operation | Description |
|------|-----------|-------------|
| path/to/file.ts | Modified | Description |

### Audit Results
- Codex: <Passed/Found N issues>
- Antigravity: <Passed/Found N issues>

### Recommendations
1. [ ] <Suggested test steps>
2. [ ] <Suggested verification steps>

---

Key Rules

1. Code Sovereignty – All file modifications by Claude, external models have zero write access
2. Dirty Prototype Refactoring – Codex/Antigravity output treated as draft, must refactor
3. Trust Rules – Backend follows Codex, Frontend follows Antigravity
4. Minimal Changes – Only modify necessary code, no side effects
5. Mandatory Audit – Must perform multi-model Code Review after changes

---

Usage

# Execute plan file
/ccg:execute .claude/plan/feature-name.md

# Execute task directly (for plans already discussed in context)
/ccg:execute implement user authentication based on previous plan

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Relationship with /ccg:plan

1. /ccg:plan generates plan + SESSION_ID
2. User confirms with "Y"
3. /ccg:execute reads plan, reuses SESSION_ID, executes implementation