our-claude-skills/custom-skills/32-seo-crawl-budget/desktop/SKILL.md

---
name: seo-crawl-budget
description: |
  Crawl budget optimization and server log analysis for search engine bots.
  Triggers: crawl budget, log analysis, bot crawling, Googlebot, crawl waste,
  orphan pages, crawl efficiency, 크롤 예산, 로그 분석, 크롤 최적화.
---

# Crawl Budget Optimizer

Analyze server access logs to identify crawl budget waste and generate optimization recommendations for search engine bots (Googlebot, Yeti/Naver, Bingbot, Daumoa/Kakao).

## Capabilities

### Log Analysis
- Parse Nginx combined, Apache combined, and CloudFront log formats
- Support for gzip/bzip2 compressed logs
- Streaming parser for files >1GB
- Date range filtering
- Custom format via regex

### Bot Profiling
- Identify bots by User-Agent: Googlebot (and variants), Yeti (Naver), Bingbot, Daumoa (Kakao), Applebot, DuckDuckBot, Baiduspider
- Per-bot metrics: requests/day, requests/hour, unique URLs crawled
- Status code distribution per bot (200, 301, 404, 500)
- Crawl depth distribution
- Crawl pattern analysis (time of day, days of week)
- Most crawled URLs per bot

### Waste Detection
- **Parameter URLs**: ?sort=, ?filter=, ?page=, ?utm_* consuming crawl budget
- **Redirect chains**: Multiple redirects consuming crawl slots
- **Soft 404s**: 200 status pages with error/empty content
- **Duplicate URLs**: www/non-www, http/https, trailing slash variants
- **Low-value pages**: Thin content pages, noindex pages being crawled

### Orphan Page Detection
- Pages in sitemap but never crawled by bots
- Pages crawled but not in sitemap
- Crawled pages with no internal links pointing to them

## Workflow

### Step 1: Obtain Server Access Logs
Request or locate server access logs from the target site. Supported formats:
- Nginx: `/var/log/nginx/access.log`
- Apache: `/var/log/apache2/access.log`
- CloudFront: Downloaded from S3 or CloudWatch

### Step 2: Parse Access Logs
```bash
python scripts/log_parser.py --log-file access.log --json
python scripts/log_parser.py --log-file access.log.gz --streaming --json
python scripts/log_parser.py --log-file access.log --bot googlebot --json
```

### Step 3: Crawl Budget Analysis
```bash
python scripts/crawl_budget_analyzer.py --log-file access.log --sitemap https://example.com/sitemap.xml --json
python scripts/crawl_budget_analyzer.py --log-file access.log --scope waste --json
python scripts/crawl_budget_analyzer.py --log-file access.log --scope orphans --json
python scripts/crawl_budget_analyzer.py --log-file access.log --scope bots --json
```

### Step 4: Cross-Reference with Ahrefs (Optional)
Use `site-explorer-pages-history` to compare indexed pages vs crawled pages.

### Step 5: Generate Recommendations
Prioritized action items:
1. robots.txt optimization (block parameter URLs, low-value paths)
2. URL parameter handling (Google Search Console settings)
3. Noindex/nofollow for low-value pages
4. Redirect chain resolution (reduce 301 → 301 → 200 to 301 → 200)
5. Internal linking improvements for orphan pages

### Step 6: Report to Notion
Save Korean-language report to SEO Audit Log database.

## MCP Tools Used

| Tool | Purpose |
|------|---------|
| Ahrefs `site-explorer-pages-history` | Compare indexed pages with crawled pages |
| Notion | Save audit report to database |
| WebSearch | Current bot documentation and best practices |

## Output Format

```json
{
  "log_file": "access.log",
  "analysis_period": {"from": "2025-01-01", "to": "2025-01-31"},
  "total_bot_requests": 150000,
  "bots": {
    "googlebot": {
      "requests": 80000,
      "unique_urls": 12000,
      "avg_requests_per_day": 2580,
      "status_distribution": {"200": 70000, "301": 5000, "404": 3000, "500": 2000}
    },
    "yeti": {"requests": 35000},
    "bingbot": {"requests": 20000},
    "daumoa": {"requests": 15000}
  },
  "waste": {
    "parameter_urls": {"count": 5000, "pct_of_crawls": 3.3},
    "redirect_chains": {"count": 2000, "pct_of_crawls": 1.3},
    "soft_404s": {"count": 1500, "pct_of_crawls": 1.0},
    "total_waste_pct": 8.5
  },
  "orphan_pages": {
    "in_sitemap_not_crawled": [],
    "crawled_not_in_sitemap": []
  },
  "recommendations": [],
  "efficiency_score": 72,
  "timestamp": "2025-01-01T00:00:00"
}
```

## Limitations

- Requires actual server access logs (not available via standard web crawling)
- Log format auto-detection may need manual format specification for custom formats
- CloudFront logs have a different field structure than Nginx/Apache
- Large log files (>10GB) may need pre-filtering before analysis
- Bot identification relies on User-Agent strings which can be spoofed

## Notion Output (Required)

All audit reports MUST be saved to the OurDigital SEO Audit Log:
- **Database ID**: `2c8581e5-8a1e-8035-880b-e38cefc2f3ef`
- **Category**: Crawl Budget
- **Audit ID Format**: CRAWL-YYYYMMDD-NNN
- **Language**: Korean with technical English terms (Crawl Budget, Googlebot, robots.txt)

## Reference Scripts

Located in `code/scripts/`:
- `log_parser.py` — Server access log parser with bot identification
- `crawl_budget_analyzer.py` — Crawl budget efficiency analysis
- `base_client.py` — Shared async client utilities