Feature, Gap & Bottleneck Analysis (feature-gap-bottleneck-analysis)

Combines Single-Agent Cognitive Scale-Up (high-density batch scanning, symbolic indexing, fractal clustering) with Pragmatic Minimalism (lean solutions, liability reduction, zero unnecessary abstractions) to audit codebases for missing capabilities, structural gaps, performance bottlenecks, and system friction—followed by concrete, high-ROI improvement blueprints.

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When to Use This Skill

• Triggered by keywords or user intent:
  • English: "missing feature", "feature gap", "gap analysis", "find bottlenecks", "system bottleneck", "performance gap", "architectural gap", "audit codebase gaps", "system audit", "improvement suggestions".
  • Indonesian: "missing fitur", "fitur hilang", "fitur terlewat", "analisis gap", "analisis bottleneck", "temukan bottleneck", "saran perbaikan", "penambahan fitur", "peningkatan sistem".
• When conducting system health checks, pre-refactor audits, or technical debt assessments.
• When reviewing a module/workspace for missing edge-case handling, incomplete user flows, or latent performance limiters.

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Core Principles

1. High-Density Vector Indexing (G[001..N]): Map all discovered issues into compact symbolic representations rather than verbose prose.
2. Fractal Clustering ($\alpha, \beta, \gamma, \delta$): Group micro-gaps into macro structural categories to solve systemic root causes rather than patching symptoms.
3. Pragmatic ROI Filtering: Evaluate all potential additions/enhancements using the Impact vs. Complexity matrix. Reject speculative or over-engineered suggestions.
4. Code is Liability: Prefer solution vectors that delete redundant code, recycle existing helpers, or leverage standard/native APIs over introducing new dependencies or heavy layers.

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Execution Workflow

[Target Codebase / Feature Scope]
              │
              ▼
  Phase 1: Vector Indexing G[001..N] (High-Density Scanning)
              │
              ▼
  Phase 2: Fractal Category Clustering (α, β, γ, δ)
              │
              ▼
  Phase 3: Pragmatic ROI Filter (Impact vs Complexity Matrix)
              │
              ▼
  Phase 4: Actionable Resolution Vectors (Lean Patch Blueprints)

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Phase 1: High-Density Diagnostic Scanning (G[001..N])

Scan the target scope (code files, routing, state management, API routes, configurations) and convert each finding into a vectorized symbolic index:

G[001..N] = { ID, FileLocation, IssueType, InvariantBreach, Symptom }

Example Indexing:

• G001: [routes/user.ts:L42] ↔ [Missing Validation] ⇒ [Invalid Payload crash] → TYPE: Gap
• G002: [services/sync.ts:L115] ↔ [Sequential Await Loop] ⇒ [High Latency] → TYPE: Bottleneck
• G003: [components/Chat.tsx] ↔ [No Retry on Websocket Disconnect] ⇒ [Stale UI State] → TYPE: MissingFeature

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Phase 2: Fractal Category Clustering

Group all G[001..N] micro-findings into 4 Macro Root Cause Clusters:

Cluster	Category	Focus Area	Example Symptoms
Cluster $\alpha$	Missing Features & Incomplete Flows	Missing API capabilities, unhandled user intents, incomplete lifecycle events, missing UI states (empty/loading/error).	No pagination on list endpoint, missing session resume feature.
Cluster $\beta$	Architectural & Security Gaps	Type safety holes, unhandled edge cases, race conditions, missing input bounds, broken authorization checks.	Missing payload schema validation, uncaught promise rejection in background job.
Cluster $\gamma$	Performance & Resource Bottlenecks	Blocking sync execution, redundant DB/network calls, memory leaks, unindexed queries, expensive re-renders.	Sequential await in Array.map, unthrottled search handler.
Cluster $\delta$	Complexity & Maintainability Liabilities	Over-engineered layers, duplicate utility functions, dead code, single-caller abstractions, tight coupling.	Custom HTTP wrapper replacing standard fetch, 1500-line bloated router file.

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Phase 3: Pragmatic ROI Filter Matrix

Filter every proposed improvement through the Pragmatic ROI Grid before presenting recommendations:

                  High Impact
                      │
     [QUICK WIN]      │    [CORE REFACTOR]
     High Value,      │    High Value,
     Low Complexity   │    Medium/High Effort
──────────────────────┼──────────────────────
     [DISCARD]        │    [DEFER / AVOID]
     Low Value,       │    Low Value,
     Low Complexity   │    High Complexity (Over-engineering)
                      │
                  Low Impact
  Low Complexity ────────────── High Complexity

• Include: Quick Wins & Core Refactors.
• Reject / Exclude: Low-impact over-engineering, speculative abstractions, or installing heavy third-party libraries when built-in runtime APIs suffice.

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Phase 4: Output & Actionable Resolution Vectors

Present the analysis using a Zero-Fluff Findings Matrix followed by Pragmatic Improvement Blueprints.

1. Discovered Gaps & Bottlenecks Matrix

| Index | Category | Target File / Location | Issue Description | Impact / Priority |
|---|---|---|---|---|
| G001 | Cluster α (Missing Feature) | `backend/src/user.ts:L42` | Missing pagination & field filtering on list API | High (Quick Win) |
| G002 | Cluster β (Arch Gap) | `backend/src/bridge.ts:L88` | Unhandled WebSocket ECONNRESET crashes process | Critical (Core Refactor) |
| G003 | Cluster γ (Bottleneck) | `frontend/src/Feed.tsx:L12` | Un-memoized item list triggers full UI re-renders | Med (Quick Win) |
| G004 | Cluster δ (Liability) | `backend/src/utils.ts:L100` | Custom 200-line string parser replacing `URLSearchParams` | Med (Cleanup) |

2. Pragmatic Improvement Blueprints

For each high-priority cluster/index, provide lean, actionable improvement blueprints:

### Blueprint 1: [G001] Add Lean Pagination & Filtering
- **Target**: `[user.ts](file:///d:/path/to/user.ts#L42-L60)`
- **Problem**: Large payloads cause high latency and memory spikes.
- **Pragmatic Solution**: Leverage native SQL `LIMIT/OFFSET` or query param parsing with zero extra packages.
- **Delta Vector**:
  ```diff
  - const users = await db.query('SELECT * FROM users');
  + const limit = Math.min(Number(req.query.limit) || 20, 100);
  + const offset = Number(req.query.offset) || 0;
  + const users = await db.query('SELECT * FROM users LIMIT ? OFFSET ?', [limit, offset]);

• Verification: Test API with ?limit=10&offset=0.

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## Quick Diagnostic Checklist

When running this skill, answer these 5 diagnostic questions:
1. **Feature Check**: What logical user flow or system interaction ends abruptly without resolution?
2. **Robustness Check**: Where does the application crash when given unexpected or missing inputs?
3. **Bottleneck Check**: Where is execution synchronously blocked waiting on sequential I/O or heavy loops?
4. **Complexity Check**: What custom hand-rolled code can be replaced by built-in runtime/platform APIs?
5. **Liability Check**: Which files exceed length/complexity bounds (>500 lines or high nesting) and need modular splitting?