⚠️ EXECUTION CONTRACT (MANDATORY - CANNOT SKIP)

This skill uses ENFORCED execution mode. You MUST follow this exact sequence.

STEP 1: Display Visual Indicators (MANDATORY - BLOCKING)

Check provider availability:

command -v codex &> /dev/null && codex_status="Available ✓" || codex_status="Not installed ✗"
command -v gemini &> /dev/null && gemini_status="Available ✓" || gemini_status="Not installed ✗"

Display this banner BEFORE orchestrate.sh execution:

🐙 **CLAUDE OCTOPUS ACTIVATED** - Architecture design mode
🏗️ Architecture: [Brief description of system to design]

Provider Availability:
🔴 Codex CLI: ${codex_status} - Backend architecture patterns
🟡 Gemini CLI: ${gemini_status} - Alternative approaches
🔵 Claude: Available ✓ - Synthesis and recommendations

💰 Estimated Cost: $0.02-0.08
⏱️  Estimated Time: 3-7 minutes

Validation:

• If BOTH Codex and Gemini unavailable → STOP, suggest: /octo:setup
• If ONE unavailable → Continue with available provider(s)
• If BOTH available → Proceed normally

DO NOT PROCEED TO STEP 2 until banner displayed.

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STEP 2: Execute orchestrate.sh spawn (MANDATORY - Use Bash Tool)

You MUST execute this command via the Bash tool:

${CLAUDE_PLUGIN_ROOT}/scripts/orchestrate.sh spawn backend-architect "<user's architecture request>"

CRITICAL: You are PROHIBITED from:

• ❌ Designing architecture directly without calling orchestrate.sh
• ❌ Using direct analysis as a substitute
• ❌ Claiming you're "simulating" the workflow
• ❌ Proceeding to Step 3 without running this command

This is NOT optional. You MUST use the Bash tool to invoke orchestrate.sh.

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STEP 3: Verify Execution (MANDATORY - Validation Gate)

After orchestrate.sh completes, verify it succeeded:

# Check for persona output (varies by persona type)
# For spawn commands, check exit code and output
if [ $? -ne 0 ]; then
  echo "❌ VALIDATION FAILED: orchestrate.sh spawn failed"
  exit 1
fi

echo "✅ VALIDATION PASSED: Architecture design completed"

If validation fails:

1. Report error to user
2. Show logs from ~/.claude-octopus/logs/
3. DO NOT proceed with presenting results
4. DO NOT substitute with direct design

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STEP 4: Present Results (Only After Steps 1-3 Complete)

Present the architecture design from the persona execution.

Include attribution:

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*Multi-AI Architecture Design powered by Claude Octopus*
*Providers: 🔴 Codex | 🟡 Gemini | 🔵 Claude*

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Architecture Skill

Invokes the backend-architect persona for system design during the grasp (define) and tangle (develop) phases.

Usage

# Via orchestrate.sh
${CLAUDE_PLUGIN_ROOT}/scripts/orchestrate.sh spawn backend-architect "Design a scalable notification system"

# Via auto-routing (detects architecture intent)
${CLAUDE_PLUGIN_ROOT}/scripts/orchestrate.sh auto "architect the event-driven messaging system"

Capabilities

• API design and RESTful patterns
• Microservices architecture
• Distributed systems design
• Event-driven architecture
• Database schema design
• Scalability planning

Persona Reference

This skill wraps the backend-architect persona defined in:

• agents/personas/backend-architect.md
• CLI: codex
• Model: gpt-5.3-codex
• Phases: grasp, tangle
• Expertise: api-design, microservices, distributed-systems

Example Prompts

"Design the API contract for the user service"
"Plan the event sourcing architecture"
"Design the caching strategy for the product catalog"
"Create a microservices decomposition plan"

LSP Integration (Claude Code 2.1.14+)

For enhanced structural awareness during architecture design, leverage Claude Code's LSP tools:

Recommended LSP Tool Usage

1. Before defining architecture, gather structural context:

   lsp_document_symbols - Understand existing module structure
   lsp_find_references  - Identify current dependencies
   lsp_workspace_symbols - Find related patterns across codebase

2. During design validation:

   lsp_goto_definition  - Verify interface contracts
   lsp_hover           - Check type signatures
   lsp_diagnostics     - Identify type/interface mismatches

Example Workflow

// Step 1: Understand existing structure
const symbols = await lsp_document_symbols("src/services/user.ts")
const references = await lsp_find_references("UserService", line=5, char=10)

// Step 2: Identify patterns in codebase
const patterns = await lsp_workspace_symbols("Service")

// Step 3: Design new architecture informed by existing patterns
// ... architecture design ...

// Step 4: Validate design with diagnostics
const issues = await lsp_diagnostics("src/services/*.ts")

This ensures architecture recommendations align with existing codebase patterns and type contracts.