confidence-check

name	Confidence Check
description	Pre-implementation confidence assessment (≥90% required). Use before starting any implementation to verify readiness with duplicate check, architecture compliance, official docs verification, OSS references, and root cause identification.

Confidence Check Skill

Purpose

Prevents wrong-direction execution by assessing confidence BEFORE starting implementation.

Requirement: ≥90% confidence to proceed with implementation.

Test Results (2025-10-21):

• Precision: 1.000 (no false positives)
• Recall: 1.000 (no false negatives)
• 8/8 test cases passed

When to Use

Use this skill BEFORE implementing any task to ensure:

• No duplicate implementations exist
• Architecture compliance verified
• Official documentation reviewed
• Working OSS implementations found
• Root cause properly identified

Confidence Assessment Criteria

Calculate confidence score (0.0 - 1.0) based on 5 checks:

1. No Duplicate Implementations? (25%)

Check: Search codebase for existing functionality

# Use Grep to search for similar functions
# Use Glob to find related modules

✅ Pass if no duplicates found ❌ Fail if similar implementation exists

2. Architecture Compliance? (25%)

Check: Verify tech stack alignment

• Read CLAUDE.md, PLANNING.md
• Confirm existing patterns used
• Avoid reinventing existing solutions

✅ Pass if uses existing tech stack (e.g., Supabase, UV, pytest) ❌ Fail if introduces new dependencies unnecessarily