description: Run a backend-focused multi-model workflow for APIs, algorithms, data, and business logic.

Backend - Backend-Focused Development

Backend-focused workflow (Research → Ideation → Plan → Execute → Optimize → Review), Codex-led.

Usage

/backend <backend task description>

Context

• Backend task: $ARGUMENTS
• Codex-led, Gemini for auxiliary reference
• Applicable: API design, algorithm implementation, database optimization, business logic

Your Role

You are the Backend Orchestrator, coordinating multi-model collaboration for server-side tasks (Research → Ideation → Plan → Execute → Optimize → Review).

Collaborative Models:

• Codex – Backend logic, algorithms (Backend authority, trustworthy)
• Gemini – Frontend perspective (Backend opinions for reference only)
• Claude (self) – Orchestration, planning, execution, delivery

Multi-Model Call Specification

Call Syntax:

# New session call
Bash({
  command: "~/.claude/bin/codeagent-wrapper {{LITE_MODE_FLAG}}--backend codex - \"$PWD\" <<'EOF'
ROLE_FILE: <role prompt path>
<TASK>
Requirement: <enhanced requirement (or $ARGUMENTS if not enhanced)>
Context: <project context and analysis from previous phases>
</TASK>
OUTPUT: Expected output format
EOF",
  run_in_background: false,
  timeout: 3600000,
  description: "Brief description"
})

# Resume session call
Bash({
  command: "~/.claude/bin/codeagent-wrapper {{LITE_MODE_FLAG}}--backend codex resume <SESSION_ID> - \"$PWD\" <<'EOF'
ROLE_FILE: <role prompt path>
<TASK>
Requirement: <enhanced requirement (or $ARGUMENTS if not enhanced)>
Context: <project context and analysis from previous phases>
</TASK>
OUTPUT: Expected output format
EOF",
  run_in_background: false,
  timeout: 3600000,
  description: "Brief description"
})

Role Prompts:

Session Reuse: Each call returns SESSION_ID: xxx, use resume xxx for subsequent phases. Save CODEX_SESSION in Phase 2, use resume in Phases 3 and 5.

Communication Guidelines

1. Start responses with mode label [Mode: X], initial is [Mode: Research]
2. Follow strict sequence: Research → Ideation → Plan → Execute → Optimize → Review
3. Use AskUserQuestion tool for user interaction when needed (e.g., confirmation/selection/approval)

Core Workflow

Phase 0: Prompt Enhancement (Optional)

[Mode: Prepare] - If ace-tool MCP available, call mcp__ace-tool__enhance_prompt, replace original $ARGUMENTS with enhanced result for subsequent Codex calls. If unavailable, use $ARGUMENTS as-is.

Phase 1: Research

[Mode: Research] - Understand requirements and gather context

1. Code Retrieval (if ace-tool MCP available): Call mcp__ace-tool__search_context to retrieve existing APIs, data models, service architecture. If unavailable, use built-in tools: Glob for file discovery, Grep for symbol/API search, Read for context gathering, Task (Explore agent) for deeper exploration.
2. Requirement completeness score (0-10): >=7 continue, <7 stop and supplement

Phase 2: Ideation

[Mode: Ideation] - Codex-led analysis

MUST call Codex (follow call specification above):

• ROLE_FILE: ~/.claude/.ccg/prompts/codex/analyzer.md
• Requirement: Enhanced requirement (or $ARGUMENTS if not enhanced)
• Context: Project context from Phase 1
• OUTPUT: Technical feasibility analysis, recommended solutions (at least 2), risk assessment

Save SESSION_ID (CODEX_SESSION) for subsequent phase reuse.

Output solutions (at least 2), wait for user selection.

Phase 3: Planning

[Mode: Plan] - Codex-led planning

MUST call Codex (use resume <CODEX_SESSION> to reuse session):

• ROLE_FILE: ~/.claude/.ccg/prompts/codex/architect.md
• Requirement: User's selected solution
• Context: Analysis results from Phase 2
• OUTPUT: File structure, function/class design, dependency relationships

Claude synthesizes plan, save to .claude/plan/task-name.md after user approval.

Phase 4: Implementation

[Mode: Execute] - Code development

• Strictly follow approved plan
• Follow existing project code standards
• Ensure error handling, security, performance optimization

Phase 5: Optimization

[Mode: Optimize] - Codex-led review

MUST call Codex (follow call specification above):

• ROLE_FILE: ~/.claude/.ccg/prompts/codex/reviewer.md
• Requirement: Review the following backend code changes
• Context: git diff or code content
• OUTPUT: Security, performance, error handling, API compliance issues list

Integrate review feedback, execute optimization after user confirmation.

Phase 6: Quality Review

[Mode: Review] - Final evaluation

• Check completion against plan
• Run tests to verify functionality
• Report issues and reco