feat: add codebase context generation prompt with evidence-based analysis

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docs/research/codebase-context/README.md

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+# Research: Reverse Engineering & Codebase Analysis Patterns
+
+**Last Updated:** 2025-01-21
+**Status:** Research Complete - Implementation Phase 1 Complete
+
+---
+
+## Overview
+
+This directory contains research and analysis conducted to improve our MCP spec-driven development prompts. The research synthesizes patterns from:
+
+1. **Claude Code feature-dev plugin** - Production-tested 7-phase workflow
+2. **Existing research files** - code-analyst, information-analyst, context_bootstrap patterns
+3. **Best practices** - Evidence-based analysis, confidence assessment, interactive questioning
+
+**Primary Goal:** Enhance prompts with battle-tested patterns for better feature development outcomes.
+
+---
+
+## Research Documents
+
+### 1. Claude Code Feature-Dev Comparison
+
+**File:** [`claude-code-feature-dev-comparison.md`](./claude-code-feature-dev-comparison.md)
+**Size:** 18,287 words
+**Purpose:** Comprehensive analysis of Claude Code's feature-dev plugin
+
+**Contents:**
+
+- Complete 7-phase workflow breakdown
+- Agent specifications (code-explorer, code-architect, code-reviewer)
+- Comparison with our current MCP prompts
+- Gap analysis with priority ratings (Critical/Important/Minor)
+- Implementation roadmap (3 sprints)
+- Updated workflow diagrams
+- Detailed recommendations
+
+**Key Findings:**
+
+- ❌ Missing mandatory clarifying questions phase
+- ❌ No architecture options comparison
+- ❌ No quality review before completion
+- ✅ Good: Document-based artifacts
+- ✅ Good: Explicit sequencing
+- ✅ Good: Comprehensive analysis
+
+**Use This For:**
+
+- Understanding Claude Code's proven workflow
+- Identifying gaps in our current approach
+- Planning future enhancements
+- Architecture decision justification
+
+---
+
+### 2. Research Synthesis
+
+**File:** [`research-synthesis.md`](./research-synthesis.md)
+**Size:** 8,000+ words
+**Purpose:** Actionable integration plan combining all research sources
+
+**Contents:**
+
+- Core philosophy: Code (WHAT/HOW) vs Docs (WHY) vs User (Intent)
+- Two-agent specialization pattern (code-analyst + information-analyst)
+- Manager orchestration pattern (context_bootstrap)
+- Comparison matrix: Our approach vs Research best practices
+- Actionable recommendations with priority matrix
+- Specific enhancements for each prompt
+- Implementation roadmap (3 sprints)
+- Success metrics
+
+**Key Recommendations:**
+
+- 🔴 HIGH: Evidence citation standards (file:line, path#heading)
+- 🔴 HIGH: Confidence assessment (High/Medium/Low)
+- 🔴 HIGH: Mandatory clarifying phase in spec generation
+- 🔴 HIGH: Architecture options prompt (new)
+- 🔴 HIGH: Implementation review prompt (new)
+- 🟡 MEDIUM: Interactive phased questioning
+- 🟡 MEDIUM: ADR template creation
+
+**Use This For:**
+
+- Planning specific prompt enhancements
+- Understanding priority of improvements
+- Implementation guidance with examples
+- Success criteria for each enhancement
+
+---
+
+### 3. Code Analyst Pattern
+
+**File:** [`code-analyst.md`](./code-analyst.md)
+**Source:** Existing research file (cataloged)
+**Purpose:** Specialized agent for discovering WHAT and HOW from code
+
+**Responsibilities:**
+
+- Discover WHAT system does (features, workflows, business rules)
+- Discover HOW it's structured (architecture, patterns, communication)
+- Identify WHAT technologies are used
+
+**Key Principles:**
+
+- Code is ground truth - report what exists
+- Be specific - reference exact file:line
+- Distinguish fact from inference
+- Flag feature toggles and dormant code
+- **Stay in lane** - don't infer WHY
+
+**What NOT to include:**
+
+- ❌ Internal data models (implementation detail)
+- ❌ Missing/planned features (belongs in roadmap)
+- ❌ Code quality judgments
+- ❌ Specific versions (too volatile)
+- ❌ Testing infrastructure details
+
+**Applied To:** `generate-codebase-context` Phase 3 (Code Analysis)
+
+---
+
+### 4. Information Analyst Pattern
+
+**File:** [`information-analyst.md`](./information-analyst.md)
+**Source:** Existing research file (cataloged)
+**Purpose:** Specialized agent for extracting WHY from documentation
+
+**Primary Job:** Extract decision rationale from docs (not discoverable from code)
+
+**Responsibilities:**
+
+- Discover WHY system was built this way
+- Extract rationale from documentation
+- Find decision context and trade-offs
+- Capture historical evolution
+
+**What to Look For:**
+
+- Why was [technology X] chosen?
+- Why [pattern Y] over alternatives?
+- What constraints drove decisions?
+- What trade-offs were considered?
+
+**Key Principles:**
+
+- Direct quotes for "why"
+- Source everything (path#heading)
+- Attach metadata (timestamps)
+- Flag conflicts, don't resolve
+- Distinguish explicit vs implicit
+- Focus on rationale (unique value)
+
+**Applied To:** `generate-codebase-context` Phase 2 (Documentation Audit)
+
+---
+
+### 5. Context Bootstrap Pattern
+
+**File:** [`context_bootstrap.md`](./context_bootstrap.md)
+**Source:** Existing research file (cataloged)
+**Purpose:** Manager orchestration pattern for coordinating specialized agents
+
+**Core Philosophy:**
+> "Code explains HOW the system currently behaves; the user supplies WHAT it is supposed to achieve and WHY choices were made."
+
+**Six-Phase Workflow:**
+
+1. Analyze repository structure
+2. Audit existing documentation
+3. Deep code analysis (subprocess: Code Analyst)
+4. User collaboration (fill gaps, resolve conflicts)
+5. Draft documentation set (PRDs, ADRs, SYSTEM-OVERVIEW)
+6. Review with user
+
+**Key Pattern:** "Keep dialog interactive. Ask focused follow-up questions instead of long questionnaires."
+
+**Deliverables:**
+
+- PRDs (Product Requirements)
+- ADRs (Architecture Decision Records in MADR format)
+- SYSTEM-OVERVIEW.md
+- README.md updates
+
+**Applied To:** Overall `generate-codebase-context` structure and phasing
+
+---
+
+## How Research Was Applied
+
+### Phase 1 (Completed) ✅
+
+**Enhanced `generate-codebase-context` Prompt:**
+
+From **code-analyst.md:**
+
+- ✅ File:line evidence citations for all code findings
+- ✅ Confidence levels (High/Needs Validation/Unknown)
+- ✅ "Stay in your lane" - don't infer WHY from code
+- ✅ Flag feature toggles and dormant paths
+- ✅ Technology names only (NO versions)
+- ✅ Focus on working features, not missing ones
+
+From **information-analyst.md:**
+
+- ✅ Documentation audit phase (scan + timestamp + inventory)
+- ✅ Rationale extraction with direct quotes
+- ✅ Source references with path#heading format
+- ✅ Conflict detection between docs
+- ✅ Distinguish explicit vs implicit knowledge
+
+From **context_bootstrap.md:**
+
+- ✅ Repository structure detection (workspace/monorepo/single)
+- ✅ User collaboration phase (interactive, not batch)
+- ✅ Capture user answers as direct quotes for citation
+
+From **Claude Code feature-dev:**
+
+- ✅ Essential files list with line ranges (5-10 files)
+- ✅ Execution path traces (step-by-step flows)
+- ✅ Interactive short questions (not batch questionnaires)
+
+---
+
+### Phase 2 (Planned for Next PR)
+
+**Enhancements Planned:**
+
+1. **`generate-spec` Enhancement:**
+   - Mandatory clarifying phase (Claude Code Phase 3)
+   - Phased interactive questioning (context_bootstrap pattern)
+   - WHY questions (information-analyst focus)
+
+2. **`generate-architecture-options` (NEW):**
+   - Based on Claude Code code-architect agent
+   - Generate 2-3 approaches with trade-offs
+   - User must choose before proceeding
+
+3. **`review-implementation` (NEW):**
+   - Based on Claude Code code-reviewer agent
+   - Multi-focus review (bugs, quality, conventions)
+   - Confidence-based filtering (≥80%)
+
+See [`../../PROGRESS.md`](../../PROGRESS.md) for detailed roadmap.
+
+---
+
+## Key Insights
+
+### 1. Separation of Concerns
+
+**Discovery:** Code, docs, and users each provide different information
+
+- **Code → WHAT + HOW:** Features, architecture, patterns (observable facts)
+- **Docs → WHY:** Decisions, rationale, trade-offs (recorded intent)
+- **User → Goals + Intent:** Purpose, value, strategic fit (current direction)
+
+**Application:** Don't conflate these sources - keep them separate and clearly attributed
+
+---
+
+### 2. Evidence-Based Analysis
+
+**Discovery:** Every claim needs proof
+
+- Code findings: `file.ts:45-67` (line ranges)
+- Doc findings: `doc.md#heading` (section anchors)
+- User input: `[User confirmed: YYYY-MM-DD]` (dated quotes)
+
+**Application:** Traceability and accountability for all findings
+
+---
+
+### 3. Confidence Assessment
+
+**Discovery:** Distinguish facts from inferences
+
+- High: Strong evidence from working code or explicit docs
+- Medium: Inferred from context, feature flags, implied
+- Low: Cannot determine, conflicts, unknowns
+
+**Application:** Flag gaps explicitly rather than guessing
+
+---
+
+### 4. Interactive Collaboration
+
+**Discovery:** Short focused conversations > long questionnaires
+
+- Ask 3-5 questions, wait for answers
+- Use answers to inform next round of questions
+- Capture direct quotes for later citation
+
+**Application:** Better engagement, more thoughtful answers
+
+---
+
+### 5. Mandatory Checkpoints
+
+**Discovery:** Critical decisions need explicit user approval
+
+- ⛔ STOP after clarifying questions (don't proceed without answers)
+- ⛔ STOP after architecture options (user must choose)
+- ⛔ STOP after implementation (user decides what to fix)
+
+**Application:** User control at key decision points
+
+---
+
+## Success Metrics
+
+### Phase 1 Metrics ✅
+
+- ✅ 100% of code findings have file:line citations
+- ✅ 100% of findings categorized by confidence level
+- ✅ Documentation audit phase included
+- ✅ Interactive questioning approach (3-5 questions per round)
+- ✅ Essential files list structure (5-10 files with ranges)
+- ✅ Execution path traces included in examples
+
+### Phase 2 Metrics (Target)
+
+- [ ] Clarifying questions are mandatory (cannot proceed without)
+- [ ] Architecture options always present 2-3 approaches
+- [ ] User explicitly chooses architecture before tasks
+- [ ] Review catches common issues before PR
+- [ ] All prompts use consistent evidence standards
+
+---
+
+## References
+
+### External Sources
+
+- [Claude Code Repository](https://github.com/anthropics/claude-code)
+- [Feature-Dev Plugin](https://github.com/anthropics/claude-code/tree/main/plugins/feature-dev)
+- [Feature-Dev README](https://github.com/anthropics/claude-code/blob/main/plugins/feature-dev/README.md)
+- [Code Explorer Agent](https://github.com/anthropics/claude-code/blob/main/plugins/feature-dev/agents/code-explorer.md)
+- [Code Architect Agent](https://github.com/anthropics/claude-code/blob/main/plugins/feature-dev/agents/code-architect.md)
+- [Code Reviewer Agent](https://github.com/anthropics/claude-code/blob/main/plugins/feature-dev/agents/code-reviewer.md)
+- [MADR Format](https://adr.github.io/madr/)
+
+### Internal Documents
+
+- [Progress Tracking](../../PROGRESS.md)
+- [Main README](../../../README.md)
+
+---
+
+## Next Steps
+
+1. **Review Phase 1 PR:** `add-reverse-engineer-codebase-prompt` branch
+2. **Plan Phase 2 PR:** After Phase 1 merge
+3. **Implement remaining enhancements:** Per roadmap in PROGRESS.md
+
+---
+
+**Research Status:** Complete and applied to Phase 1
+**Next Research:** None planned - focus on implementation
+**Last Updated:** 2025-01-21