Impact Analysis Skill

Analyze the cascade impact of modifying a component using the project ontology's dependency graph.

Usage

/team-shinchan:impact-analysis <target> [options]

Parameters

• <target> — Entity name, ID, or file path to analyze
• --depth <N> — Traversal depth (default: 2, max: 5)
• --direction outgoing|incoming|both — Direction of analysis (default: both)

Process

1. Locate Target Entity

1. Check if .shinchan-docs/ontology/ontology.json exists
2. If not: "No ontology found. Run /team-shinchan:ontology scan first."
3. Search for target by:
   • Exact entity ID match
   • Entity name substring match
   • File path match (for Component entities)
4. If multiple matches, list them and ask user to clarify

2. Cascade Analysis

Run node ${CLAUDE_PLUGIN_ROOT}/src/ontology-engine.js related <entityId> with the specified depth.

Analyze the result:

• Direct dependencies (depth 1): Components that directly depend on target
• Indirect dependencies (depth 2+): Cascade through transitive relations
• Test coverage: TESTED_BY relations for affected components
• Pattern compliance: FOLLOWS_PATTERN relations that may be affected

3. Risk Assessment

Calculate risk level based on:

• HIGH: 10+ affected entities OR target has 5+ incoming DEPENDS_ON
• MEDIUM: 5-9 affected entities OR target has 3-4 incoming DEPENDS_ON
• LOW: 1-4 affected entities OR target has 0-2 incoming DEPENDS_ON

4. Output Format

Display:

Impact Analysis: {target name}
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Risk Level: {HIGH|MEDIUM|LOW}

Direct Dependencies ({N}):
  - {component name} ({file_path}) — {relation type}
  ...

Indirect Dependencies ({N}):
  - {component name} ({file_path}) — via {intermediate}
  ...

Test Coverage:
  - {test suite name} ({file_path}) — covers {component}
  ...

Affected Modules:
  - {module name} ({N} components affected)
  ...

Recommendations:
  - {recommendation based on risk level}

Graceful Degradation

If ontology doesn't exist or target not found, suggest running scan first.