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EventLint -- Event & Message Queue Anti-Pattern Analyzer\r

\r EventLint scans codebases for event-driven architecture anti-patterns, producer/consumer issues, schema validation gaps, dead letter queue misconfigurations, ordering and delivery failures, and observability gaps across Kafka, RabbitMQ, SQS, NATS, and Redis Pub/Sub. It uses regex-based pattern matching against 90 event-specific patterns across 6 categories, lefthook for git hook integration, and produces markdown reports with actionable remediation guidance. 100% local. Zero telemetry.\r \r

Commands\r

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Free Tier (No license required)\r

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eventlint scan [file|directory]\r

One-shot event architecture quality scan of files or directories.\r \r How to execute:\r

bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" --path [target]\r
```\r
\r
**What it does:**\r
1. Accepts a file path or directory (defaults to current directory)\r
2. Discovers all source files (skips .git, node_modules, binaries, images, .min.js)\r
3. Runs 30 event architecture patterns against each file (free tier limit)\r
4. Calculates an event architecture quality score (0-100) per file and overall\r
5. Grades: A (90-100), B (80-89), C (70-79), D (60-69), F (\x3C60)\r
6. Outputs findings with: file, line number, check ID, severity, description, recommendation\r
7. Exit code 0 if score >= 70, exit code 1 if event quality is poor\r
8. Free tier limited to first 30 patterns (PP + CP categories)\r
\r
**Example usage scenarios:**\r
- "Scan my code for event issues" -> runs `eventlint scan .`\r
- "Check this file for consumer anti-patterns" -> runs `eventlint scan src/consumer.ts`\r
- "Find missing dead letter queues" -> runs `eventlint scan src/`\r
- "Audit my Kafka configuration" -> runs `eventlint scan .`\r
- "Check for message ordering problems" -> runs `eventlint scan .`\r
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### Pro Tier ($19/user/month -- requires EVENTLINT_LICENSE_KEY)\r
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#### `eventlint scan --tier pro [file|directory]`\r
Extended scan with 60 patterns covering producer, consumer, schema, and dead letter patterns.\r
\r
**How to execute:**\r
```bash\r
bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" --path [target] --tier pro\r
```\r
\r
**What it does:**\r
1. Validates Pro+ license\r
2. Runs 60 event architecture patterns (PP, CP, MS, ED categories)\r
3. Detects schema validation gaps and breaking changes\r
4. Identifies dead letter queue misconfigurations\r
5. Full category breakdown reporting\r
\r
#### `eventlint scan --format json [directory]`\r
Generate JSON output for CI/CD integration.\r
\r
```bash\r
bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" --path [directory] --format json\r
```\r
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#### `eventlint scan --format html [directory]`\r
Generate HTML report for browser viewing.\r
\r
```bash\r
bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" --path [directory] --format html\r
```\r
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#### `eventlint scan --category ED [directory]`\r
Filter scan to a specific check category (PP, CP, MS, ED, OD, EO).\r
\r
```bash\r
bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" --path [directory] --category ED\r
```\r
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### Team Tier ($39/user/month -- requires EVENTLINT_LICENSE_KEY with team tier)\r
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#### `eventlint scan --tier team [directory]`\r
Full scan with all 90 patterns across all 6 categories including ordering/delivery and observability.\r
\r
**How to execute:**\r
```bash\r
bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" --path [directory] --tier team\r
```\r
\r
**What it does:**\r
1. Validates Team+ license\r
2. Runs all 90 patterns across 6 categories\r
3. Includes ordering & delivery detection (dual-write, missing outbox, race conditions)\r
4. Includes event observability checks (no tracing, missing metrics, no audit trail)\r
5. Full category breakdown with per-file results\r
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#### `eventlint scan --verbose [directory]`\r
Verbose output showing every matched line and pattern details.\r
\r
```bash\r
bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" --path [directory] --verbose\r
```\r
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#### `eventlint status`\r
Show license and configuration information.\r
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```bash\r
bash "\x3CSKILL_DIR>/scripts/dispatcher.sh" status\r
```\r
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## Check Categories\r
\r
EventLint detects 90 event architecture anti-patterns across 6 categories:\r
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| Category | Code | Patterns | Description | Severity Range |\r
|----------|------|----------|-------------|----------------|\r
| **Producer Patterns** | PP | 15 | Fire-and-forget publish, missing keys, no schema validation, acks=0 | medium -- critical |\r
| **Consumer Patterns** | CP | 15 | No idempotency, auto-ack, unbounded prefetch, blocking handlers | low -- critical |\r
| **Message Schema** | MS | 15 | No schema registry, unversioned, breaking changes, loose typing | low -- critical |\r
| **Error & Dead Letter** | ED | 15 | Missing DLQ, infinite redelivery, swallowed exceptions, no poison handling | low -- critical |\r
| **Ordering & Delivery** | OD | 15 | Dual-write, no outbox, missing dedup, saga without timeout | low -- critical |\r
| **Event Observability** | EO | 15 | No tracing, missing metrics, no audit trail, no alerting | low -- medium |\r
\r
## Tier-Based Pattern Access\r
\r
| Tier | Patterns | Categories |\r
|------|----------|------------|\r
| **Free** | 30 | PP, CP |\r
| **Pro** | 60 | PP, CP, MS, ED |\r
| **Team** | 90 | PP, CP, MS, ED, OD, EO |\r
| **Enterprise** | 90 | PP, CP, MS, ED, OD, EO + priority support |\r
\r
## Scoring\r
\r
EventLint uses a deductive scoring system starting at 100 (perfect):\r
\r
| Severity | Point Deduction | Description |\r
|----------|-----------------|-------------|\r
| **Critical** | -25 per finding | Severe reliability issue (message loss, infinite redelivery, dual-write) |\r
| **High** | -15 per finding | Significant event problem (missing DLQ, auto-ack, no idempotency) |\r
| **Medium** | -8 per finding | Moderate concern (missing correlation ID, unversioned schema) |\r
| **Low** | -3 per finding | Informational / best practice suggestion |\r
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### Grading Scale\r
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| Grade | Score Range | Meaning |\r
|-------|-------------|---------|\r
| **A** | 90-100 | Excellent event architecture quality |\r
| **B** | 80-89 | Good architecture with minor issues |\r
| **C** | 70-79 | Acceptable but needs improvement |\r
| **D** | 60-69 | Poor event architecture quality |\r
| **F** | Below 60 | Critical event architecture problems |\r
\r
- **Pass threshold:** 70 (Grade C or better)\r
- Exit code 0 = pass (score >= 70)\r
- Exit code 1 = fail (score \x3C 70)\r
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## Configuration\r
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Users can configure EventLint in `~/.openclaw/openclaw.json`:\r
\r
```json\r
{\r
  "skills": {\r
    "entries": {\r
      "eventlint": {\r
        "enabled": true,\r
        "apiKey": "YOUR_LICENSE_KEY_HERE",\r
        "config": {\r
          "severityThreshold": "medium",\r
          "ignorePatterns": ["**/test/**", "**/fixtures/**", "**/*.test.*"],\r
          "ignoreChecks": [],\r
          "reportFormat": "text"\r
        }\r
      }\r
    }\r
  }\r
}\r
```\r
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## Important Notes\r
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- **Free tier** works immediately with no configuration\r
- **All scanning happens locally** -- no code is sent to external servers\r
- **License validation is offline** -- no phone-home or network calls\r
- Pattern matching only -- no AST parsing, no external dependencies beyond bash\r
- Supports scanning all file types in a single pass\r
- Git hooks use **lefthook** which must be installed (see install metadata above)\r
- Exit codes: 0 = pass (score >= 70), 1 = fail (for CI/CD integration)\r
- Output formats: text (default), json, html\r
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## Error Handling\r
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- If lefthook is not installed and user tries hooks, prompt to install it\r
- If license key is invalid or expired, show clear message with link to https://eventlint.pages.dev/renew\r
- If a file is binary, skip it automatically with no warning\r
- If no scannable files found in target, report clean scan with info message\r
- If an invalid category is specified with --category, show available categories\r
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## When to Use EventLint\r
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The user might say things like:\r
- "Scan my code for event issues"\r
- "Check my message queue patterns"\r
- "Find missing dead letter queues"\r
- "Detect fire-and-forget publishing"\r
- "Are there any consumer anti-patterns?"\r
- "Check for schema validation gaps"\r
- "Audit my Kafka configuration"\r
- "Find ordering and delivery issues"\r
- "Check for dual-write problems"\r
- "Scan for event observability gaps"\r
- "Run an event architecture audit"\r
- "Generate an event quality report"\r
- "Check if my consumers have idempotency"\r
- "Find missing DLQ configuration"\r
- "Check my code for auto-ack issues"\r