a5c-ai/legacy-code-interpreter
library/specializations/code-migration-modernization/skills/legacy-code-interpreter/SKILL.md
Understand and document legacy code behavior through deep analysis and behavior characterization
$ install --global
skillsauthnpx skillsauth add a5c-ai/babysitter legacy-code-interpreterInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 28, 2026, 4:33 PM172.6s2 files scanned
SKILL.md
- name:
- legacy-code-interpreter
- description:
- Understand and document legacy code behavior through deep analysis and behavior characterization
- allowed-tools:
- ["Bash", "Read", "Write", "Grep", "Glob", "Edit"]
Legacy Code Interpreter Skill
Deep analysis and interpretation of legacy code to understand undocumented behavior, extract business logic, and characterize system functionality.
Purpose
Enable legacy code understanding for:
- Business logic extraction
- Undocumented feature discovery
- Behavior characterization
- Migration planning
- Knowledge preservation
Capabilities
1. Business Logic Extraction
- Parse conditional logic
- Extract calculation formulas
- Identify validation rules
- Document decision trees
2. Undocumented Feature Discovery
- Find hidden functionality
- Identify feature flags
- Discover Easter eggs
- Map admin features
3. Control Flow Analysis
- Trace execution paths
- Map state machines
- Identify loops and recursion
- Document entry points
4. Data Flow Tracking
- Trace data transformations
- Map input to output
- Identify side effects
- Document state changes
5. Side Effect Identification
- Find external calls
- Identify I/O operations
- Map database operations
- Document messaging
6. Behavior Characterization
- Create behavior summaries
- Generate pseudo-code
- Document edge cases
- Map error handling
Tool Integrations
| Tool | Purpose | Integration Method | |------|---------|-------------------| | Understand (SciTools) | Deep analysis | CLI / API | | Lattix | Architecture analysis | CLI | | CodeScene | Behavioral analysis | API | | Sourcetrail | Code exploration | CLI | | ast-grep | Pattern matching | MCP / CLI |
Output Schema
{
"analysisId": "string",
"timestamp": "ISO8601",
"interpretation": {
"businessLogic": [
{
"name": "string",
"location": "string",
"description": "string",
"pseudoCode": "string",
"inputs": [],
"outputs": [],
"sideEffects": []
}
],
"controlFlow": {
"entryPoints": [],
"stateMachines": [],
"criticalPaths": []
},
"dataFlow": {
"transformations": [],
"stateChanges": []
},
"undocumented": []
}
}
Integration with Migration Processes
- legacy-codebase-assessment: Primary interpretation tool
- migration-planning-roadmap: Knowledge source
Related Skills
static-code-analyzer: Structural analysisknowledge-extractor: Documentation mining
Related Agents
legacy-system-archaeologist: Uses for excavation
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