---

description: Create a multi-model implementation plan without modifying production code.

Plan - Multi-Model Collaborative Planning

Multi-model collaborative planning - Context retrieval + Dual-model analysis → Generate step-by-step implementation plan.

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
• Mandatory Parallel: Codex/Antigravity calls MUST use run_in_background: true (including single model calls, to avoid blocking main thread)
• Code Sovereignty: External models have zero filesystem write access, all modifications by Claude
• Stop-Loss Mechanism: Do not proceed to next phase until current phase output is validated
• Planning Only: This command allows reading context and writing to .claude/plan/* plan files, but NEVER modify production code

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Multi-Model Call Specification

Call Syntax (parallel: use run_in_background: true):

Bash({
  command: "~/.claude/bin/codeagent-wrapper {{LITE_MODE_FLAG}}--backend <codex|antigravity> - \"$PWD\" <<'EOF'
ROLE_FILE: <role prompt path>
<TASK>
Requirement: <enhanced requirement>
Context: <retrieved project context>
</TASK>
OUTPUT: Step-by-step implementation plan with pseudo-code. DO NOT modify any files.
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
Analysis	~/.claude/.ccg/prompts/codex/analyzer.md	~/.claude/.ccg/prompts/antigravity/analyzer.md
Planning	~/.claude/.ccg/prompts/codex/architect.md	~/.claude/.ccg/prompts/antigravity/architect.md

Session Reuse: Each call returns SESSION_ID: xxx (typically output by wrapper), MUST save for subsequent /ccg:execute use.

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

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Execution Workflow

Planning Task: $ARGUMENTS

Phase 1: Full Context Retrieval

[Mode: Research]

1.1 Prompt Enhancement (MUST execute first)

If ace-tool MCP is available, call mcp__ace-tool__enhance_prompt tool:

mcp__ace-tool__enhance_prompt({
  prompt: "$ARGUMENTS",
  conversation_history: "<last 5-10 conversation turns>",
  project_root_path: "$PWD"
})

Wait for enhanced prompt, replace original $ARGUMENTS with enhanced result for all subsequent phases.

If ace-tool MCP is NOT available: Skip this step and use the original $ARGUMENTS as-is for all subsequent phases.

1.2 Context Retrieval

If ace-tool MCP is available, call mcp__ace-tool__search_context tool:

mcp__ace-tool__search_context({
  query: "<semantic query based on enhanced requirement>",
  project_root_path: "$PWD"
})

• Build semantic query using natural language (Where/What/How)
• NEVER answer based on assumptions

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

1. Glob: Find relevant files by pattern (e.g., Glob("**/*.ts"), Glob("src/**/*.py"))
2. Grep: Search for key symbols, function names, class definitions (e.g., Grep("className|functionName"))
3. Read: Read the discovered files to gather complete context
4. Task (Explore agent): For deeper exploration, use Task with subagent_type: "Explore" to search across the codebase

1.3 Completeness Check

• Must obtain complete definitions and signatures for relevant classes, functions, variables
• If context insufficient, trigger recursive retrieval
• Prioritize output: entry file + line number + key symbol name; add minimal code snippets only when necessary to resolve ambiguity

1.4 Requirement Alignment

• If requirements still have ambiguity, MUST output guiding questions for user
• Until requirement boundaries are clear (no omissions, no redundancy)

Phase 2: Multi-Model Collaborative Analysis

[Mode: Analysis]

2.1 Distribute Inputs

Parallel call Codex and Antigravity (run_in_background: true):

Distribute original requirement (without preset opinions) to both models:

1. Codex Backend Analysis:

   • ROLE_FILE: ~/.claude/.ccg/prompts/codex/analyzer.md
   • Focus: Technical feasibility, architecture impact, performance considerations, potential risks
   • OUTPUT: Multi-perspective solutions + pros/cons analysis

2. Antigravity Frontend Analysis:

   • ROLE_FILE: ~/.claude/.ccg/prompts/antigravity/analyzer.md
   • Focus: UI/UX impact, user experience, visual design
   • OUTPUT: Multi-perspective solutions + pros/cons analysis

Wait for both models' complete results with TaskOutput. Save SESSION_ID (CODEX_SESSION and ANTIGRAVITY_SESSION).

2.2 Cross-Validation

Integrate perspectives and iterate for optimization:

1. Identify consensus (strong signal)
2. Identify divergence (needs weighing)
3. Complementary strengths: Backend logic follows Codex, Frontend design follows Antigravity
4. Logical reasoning: Eliminate logical gaps in solutions

2.3 (Optional but Recommended) Dual-Model Plan Draft

To reduce risk of omissions in Claude's synthesized plan, can parallel have both models output "plan drafts" (still NOT allowed to modify files):

1. Codex Plan Draft (Backend authority):

   • ROLE_FILE: ~/.claude/.ccg/prompts/codex/architect.md
   • OUTPUT: Step-by-step plan + pseudo-code (focus: data flow/edge cases/error handling/test strategy)

2. Antigravity Plan Draft (Frontend authority):

   • ROLE_FILE: ~/.claude/.ccg/prompts/antigravity/architect.md
   • OUTPUT: Step-by-step plan + pseudo-code (focus: information architecture/interaction/accessibility/visual consistency)

Wait for both models' complete results with TaskOutput, record key differences in their suggestions.

2.4 Generate Implementation Plan (Claude Final Version)

Synthesize both analyses, generate Step-by-step Implementation Plan:

## Implementation Plan: <Task Name>

### Task Type
- [ ] Frontend (→ Antigravity)
- [ ] Backend (→ Codex)
- [ ] Fullstack (→ Parallel)

### Technical Solution
<Optimal solution synthesized from Codex + Antigravity analysis>

### Implementation Steps
1. <Step 1> - Expected deliverable
2. <Step 2> - Expected deliverable
...

### Key Files
| File | Operation | Description |
|------|-----------|-------------|
| path/to/file.ts:L10-L50 | Modify | Description |

### Risks and Mitigation
| Risk | Mitigation |
|------|------------|

### SESSION_ID (for /ccg:execute use)
- CODEX_SESSION: <session_id>
- ANTIGRAVITY_SESSION: <session_id>

Phase 2 End: Plan Delivery (Not Execution)

/ccg:plan responsibilities end here, MUST execute the following actions:

1. Present complete implementation plan to user (including pseudo-code)
2. Save plan to .claude/plan/<feature-name>.md (extract feature name from requirement, e.g., user-auth, payment-module)
3. Output prompt in bold text (MUST use actual saved file path):

---

Plan generated and saved to .claude/plan/actual-feature-name.md

Please review the plan above. You can:

• Modify plan: Tell me what needs adjustment, I'll update the plan
• Execute plan: Copy the following command to a new session

/ccg:execute .claude/plan/actual-feature-name.md

---

NOTE: The actual-feature-name.md above MUST be replaced with the actual saved filename!

4. Immediately terminate current response (Stop here. No more tool calls.)

ABSOLUTELY FORBIDDEN:

• Ask user "Y/N" then auto-execute (execution is /ccg:execute's responsibility)
• Any write operations to production code
• Automatically call /ccg:execute or any implementation actions
• Continue triggering model calls when user hasn't explicitly requested modifications

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Plan Saving

After planning completes, save plan to:

• First planning: .claude/plan/<feature-name>.md
• Iteration versions: .claude/plan/<feature-name>-v2.md, .claude/plan/<feature-name>-v3.md...

Plan file write should complete before presenting plan to user.

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Plan Modification Flow

If user requests plan modifications:

1. Adjust plan content based on user feedback
2. Update .claude/plan/<feature-name>.md file
3. Re-present modified plan
4. Prompt user to review or execute again

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Next Steps

After user approves, manually execute:

/ccg:execute .claude/plan/<feature-name>.md

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Key Rules

1. Plan only, no implementation – This command does not execute any code changes
2. No Y/N prompts – Only present plan, let user decide next steps
3. Trust Rules – Backend follows Codex, Frontend follows Antigravity
4. External models have zero filesystem write access
5. SESSION_ID Handoff – Plan must include CODEX_SESSION / ANTIGRAVITY_SESSION at end (for /ccg:execute resume <SESSION_ID> use)