description: Validate implementation approaches against Brief decisions

Decision Guard Skill

Automatically checks proposed approaches against existing architectural and business decisions.

Usage Pattern

Before implementing significant changes:

// Agent calls:
mcp__brief__brief_execute_operation({
  operation: "guard_approach",
  parameters: {
    approach: "Refactor authentication to use OAuth2 instead of API keys"
  }
})

Returns:

• ✅ Proceed: No conflicts with existing decisions
• ⚠️ Review: Potential conflicts with D-123, D-456
• ❌ Blocked: Direct conflict with D-789 (decided to keep API keys for backwards compatibility)

When to Use

Call guard_approach before:

• Architectural changes (auth, database, API design)
• Dependency changes (switching libraries)
• Breaking changes to public APIs
• Changes to core workflows

Integration Points

• task-planner agent: Calls during planning phase (REQUIRED)
• implementation agent: Calls before major refactors
• /onboard: Could optionally call to check if task conflicts with decisions

Example Workflow

User: "Refactor auth to use OAuth2"

task-planner agent:
1. Calls guard_approach("Switch from API keys to OAuth2 for authentication")
2. Response: "⚠️ Conflicts with D-234: Keep API keys for MCP server compatibility"
3. Asks user: "Existing decision D-234 requires API keys for MCP. Proceed anyway?"
4. User decides: proceed, modify approach, or cancel

Best Practices

• Call early (during planning, not after implementation)
• Be specific in approach description
• If conflict found, present options to user
• Document override reason if proceeding despite conflict