---

name: history description: Smart temporal analysis using git history - Hotspots, Coupling, and Recent Contributors model: sonnet allowed-tools: Bash, Glob, Grep, Read, Write, AskUserQuestion argument-hint: (optional) [path or scope, e.g., "src/", "frontend", "last 6 months"] [--force]

SourceAtlas: Smart Temporal Analysis (Git History)

Constitution: ANALYSIS_CONSTITUTION.md v1.0

Context

Analysis Scope: $ARGUMENTS (default: entire repository) Goal: Extract actionable insights from git history Time Limit: 5-10 minutes Prerequisite: code-maat (will ask permission to install if missing)

Quick Start

1. Check cache (skip if --force flag present)
2. Check code-maat installation (install if needed with permission)
3. Generate git log (last 12 months, code-maat compatible)
4. Run analyses: Hotspots, Coupling, Contributors
5. Risk assessment combining all dimensions
6. Generate report following output-template.md
7. Verify output using verification-guide.md
8. Auto-save to .sourceatlas/history.md

Your Task

You are analyzing git commit history to understand:

1. Hotspots - Files changed most frequently (likely complex/risky)
2. Temporal Coupling - Files that change together (hidden dependencies)
3. Recent Contributors - Who has knowledge of which areas (bus factor)
4. Risk Areas - Aggregate assessment for prioritization

What You'll Discover

| Analysis Type | Insight | Business Value | |---------------|---------|----------------| | Hotspots | Complexity indicators | Refactoring priorities, technical debt | | Coupling | Hidden dependencies | Architecture review targets | | Contributors | Knowledge distribution | Bus factor risks, training needs | | Risk | Aggregate assessment | Resource allocation decisions |

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Core Workflow

Execute these steps in order. See workflow.md for complete details.

Step 0: Check Prerequisites (30 seconds)

Purpose: Ensure code-maat is installed and Java is available.

Check code-maat:

if [ -f "$HOME/.sourceatlas/bin/code-maat-1.0.4-standalone.jar" ]; then
  export CODEMAAT_JAR="$HOME/.sourceatlas/bin/code-maat-1.0.4-standalone.jar"
fi

If not found, use AskUserQuestion:

• "code-maat required for analysis. Install now? (requires Java 8+)"
• If yes → run ./scripts/install-codemaat.sh
• If no → show manual installation steps

→ See workflow.md#step-0

Step 1: Generate Git Log (1 minute)

Purpose: Create code-maat compatible git log file.

Default: Last 12 months

git log --all --numstat --date=short \
    --pretty=format:'--%h--%ad--%aN' \
    --after="$(date -v-12m +%Y-%m-%d)" \
    > /tmp/git-history.log

If scope specified: Filter to directory (e.g., "src/")

→ See workflow.md#step-1

Step 2: Hotspot Analysis (2 minutes)

Purpose: Identify frequently changed files.

Run code-maat revisions:

java -jar "$CODEMAAT_JAR" -l /tmp/git-history.log -c git2 -a revisions

Calculate complexity scores: LOC × Revisions

Identify top 10 hotspots sorted by complexity

→ See workflow.md#step-2

Step 3: Temporal Coupling Analysis (2 minutes)

Purpose: Find files that change together.

Run code-maat coupling:

java -jar "$CODEMAAT_JAR" -l /tmp/git-history.log -c git2 -a coupling

Filter significant couplings: degree ≥ 0.5

Categorize: Expected vs Suspicious

→ See workflow.md#step-3

Step 4: Recent Contributors Analysis (2 minutes)

Purpose: Map knowledge distribution across modules.

Run code-maat entity-ownership:

java -jar "$CODEMAAT_JAR" -l /tmp/git-history.log -c git2 -a entity-ownership

Generate knowledge map by area (src/api/, src/core/, etc.)

Identify bus factor risks: Single-contributor modules

→ See workflow.md#step-4

Step 5: Risk Assessment (1 minute)

Purpose: Combine all dimensions into actionable priorities.

Calculate composite risk: (Revisions × Coupling_Count) / Contributor_Count

Risk categories:

• Bus Factor Risk
• Complexity Risk
• Coupling Risk
• Testing Gap Risk

→ See workflow.md#step-5

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Output Format

Your analysis should follow this Markdown structure:

🗺️ SourceAtlas: History
───────────────────────────────
📜 [repo name] │ [N] months

**Analysis Period**: [start] → [end]
**Commits Analyzed**: [count]
**Files Analyzed**: [count]

## 1. Hotspots (Top 10)
[Table with Rank, File, Changes, LOC, Complexity Score]
[Insights paragraph]

## 2. Temporal Coupling (Significant Pairs)
[Table with File A, File B, Coupling, Co-changes]
[Expected vs Suspicious coupling analysis]

## 3. Recent Contributors (Knowledge Map)
[Per-area tables with Contributor, Commits, Last Active]
[Bus Factor Risks section]

## 4. Risk Summary
[Risk aggregation table]
[Priority Actions numbered list]

## 5. Recommendations
[Refactoring candidates, knowledge sharing, architecture review]

## Recommended Next
[Dynamic suggestions based on findings]

→ See output-template.md for complete specification and examples

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Critical Rules

1. Privacy Aware

• Use "Recent Contributors" not "Ownership %"
• Focus on knowledge distribution, not blame
• Frame findings as opportunities, not criticisms

2. Actionable Insights

• Every finding must have recommended action
• Reference specific commit counts and file paths
• Provide concrete next steps (not vague suggestions)

3. Evidence-Based

• All hotspot files must exist (verify)
• Commit counts must match git history (±20% tolerance)
• Contributor names must be in git log

4. Time-Bounded

• Default: 12 months (good balance)
• Minimum: 3 months (for meaningful patterns)
• Maximum: 24 months (avoid ancient history)

5. Verification Required

• Execute verification-guide.md after analysis
• Verify file paths, commit counts, contributors
• Correct discrepancies before output

6. Constitutional Compliance

Follow ANALYSIS_CONSTITUTION.md:

• Article I: Evidence-based (all claims from git/code-maat)
• Article III: Verification (run V1-V4 checks)
• Article IV: Evidence format (file:line references)
• Article V: Transparency (show analysis period, cache age)
• Article VII: User Empowerment (actionable recommendations)

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Self-Verification

After generating your analysis, execute verification steps:

Step V1: Extract Verifiable Claims

Parse output for all quantifiable claims:

• File paths (hotspots, coupled files)
• Commit counts (total, per file, per contributor)
• Contributor names
• Coupling pairs
• Date ranges

Step V2: Parallel Verification

• Verify hotspot files exist (sample 3-5)
• Verify commit counts (±20% tolerance)
• Verify contributors in git history
• Verify coupling pairs (both files exist)
• Verify date ranges within repository history

Step V3: Handle Results

• ✅ All checks pass → Proceed to output
• ⚠️ Minor issues (1-2 checks) → Correct and note
• ❌ Major issues (3+ checks) → Re-execute analysis

Step V4: Add Verification Summary

verification_summary:
  checks_performed: [...]
  confidence_level: "high"  # high|medium|low
  notes: [...]

→ See verification-guide.md for complete checklist

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Advanced

Cache Behavior

• Default: Use cache if exists
• Force flag: Skip cache with --force
• Cache location: .sourceatlas/history.md (fixed path)
• Cache age warning: If >30 days old

→ See reference.md#cache-behavior

Auto-Save Mechanism

Complete Markdown report auto-saves after verification:

💾 Saved to .sourceatlas/history.md

→ See reference.md#auto-save-behavior

Handoffs to Next Commands

Based on findings, suggest:

• High-risk hotspot → /sourceatlas:impact "[hotspot]"
• Suspicious coupling → /sourceatlas:flow "[entry point]"
• Refactoring needed → /sourceatlas:pattern "[pattern]"

→ See reference.md#handoffs

code-maat Installation

• Default location: ~/.sourceatlas/bin/code-maat-1.0.4-standalone.jar
• Auto-install via: ./scripts/install-codemaat.sh
• Requires: Java 8+

→ See reference.md#code-maat-installation

Interpretation Guidelines

• Hotspots: Not always bad (core logic changes often)
• Coupling: Expected (same domain) vs Suspicious (cross-module)
• Contributors: Healthy = 2-3 per module, Risk = single contributor

→ See reference.md#interpretation-guidelines

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Support Files

Detailed documentation available in:

• workflow.md - Complete Step 0-5 execution guide with bash commands
• output-template.md - Full Markdown structure and examples
• verification-guide.md - Self-verification steps V1-V4
• reference.md - Cache, code-maat, interpretation, troubleshooting

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Output Header

Start your output with:

🗺️ SourceAtlas: History
───────────────────────────────
📜 [repo name] │ [N] months

Then follow complete structure in output-template.md.