Babysitter migration-validator

Validate functional equivalence after migration with side-by-side comparison and behavioral verification

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/code-migration-modernization/skills/migration-validator" ~/.claude/skills/a5c-ai-babysitter-migration-validator && rm -rf "$T"

manifest: library/specializations/code-migration-modernization/skills/migration-validator/SKILL.md

Migration Validator Skill

Validates functional equivalence between source and target systems after migration through comprehensive comparison and behavioral verification.

Purpose

Enable migration validation for:

Side-by-side comparison
Output diffing
Behavioral verification
Data consistency checking
Acceptance criteria verification

Capabilities

1. Side-by-Side Comparison

Run parallel requests
Compare responses
Track differences
Document discrepancies

2. Output Diffing

Compare API responses
Diff file outputs
Check data formats
Validate transformations

3. Behavioral Verification

Test user flows
Verify business logic
Check edge cases
Validate error handling

4. Data Consistency Checking

Compare data states
Verify calculations
Check relationships
Validate constraints

5. Integration Validation

Test external integrations
Verify API contracts
Check message flows
Validate events

6. Acceptance Criteria Verification

Check feature completeness
Verify requirements
Validate user stories
Document coverage

Tool Integrations

Tool	Purpose	Integration Method
Diffy	Response comparison	API
Contract testing	API verification	CLI
Cypress	E2E validation	CLI
Playwright	Browser testing	CLI
Custom validators	Business rules	CLI

Output Schema

{
  "validationId": "string",
  "timestamp": "ISO8601",
  "source": {
    "environment": "string",
    "version": "string"
  },
  "target": {
    "environment": "string",
    "version": "string"
  },
  "results": {
    "total": "number",
    "passed": "number",
    "failed": "number",
    "skipped": "number"
  },
  "comparisons": [
    {
      "test": "string",
      "status": "passed|failed",
      "source": {},
      "target": {},
      "differences": []
    }
  ],
  "acceptance": {
    "criteria": [],
    "met": "boolean"
  }
}

Integration with Migration Processes

migration-testing-strategy: Validation execution
parallel-run-validation: Parallel comparison

Related Skills

```
performance-baseline-capturer
```
: Performance comparison
```
data-migration-validator
```
: Data validation

Related Agents

```
parallel-run-validator
```
: Parallel validation
```
regression-detector
```
: Regression detection