docs!: add ADR-042 Python migration strategy (supersedes ADR-005)#963
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Migrate ai-agents from PowerShell to Python as primary scripting language over a 12-24 month phased migration period. ## Decision Summary - Python 3.10+ established as project language standard - ADR-005 superseded for new development - Phased approach: Foundation -> New Development -> Migration - Python already prerequisite via skill-installer (PR #962) ## Rationale - 70-second PowerShell tool startup times per invocation - No CodeQL support for PowerShell (deterministic security unavailable) - AI/ML ecosystem (Anthropic SDK, MCP) is Python-native - skill-installer already requires Python 3.10+ and UV ## 6-Agent ADR Review Debate | Agent | Verdict | |-------|---------| | Analyst | CONCERNS | | Architect | CONCERNS | | Critic | CONCERNS | | Independent-Thinker | CONCERNS | | Security | CONCERNS | | High-Level-Advisor | ACCEPT | Result: Disagree-and-Commit (5 CONCERNS + 1 ACCEPT) Tie-breaker: High-Level-Advisor ## P0 Issues Resolved - Stack Overflow claim corrected (Python growth, not #1) - Path Dependence language fixed ("Python-first with phased migration") ## P1 Issues Deferred to Phase 1 Implementation - pyproject.toml creation - pytest infrastructure setup - PROJECT-CONSTRAINTS.md update - Supply chain controls (uv.lock, Dependabot, pip-audit) BREAKING CHANGE: ADR-005 PowerShell-only standard superseded. New scripts SHOULD be Python. Existing scripts migrate incrementally. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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PR Validation ReportTip ✅ Status: PASS Description Validation
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Session Protocol Compliance ReportTip ✅ Overall Verdict: PASS All session protocol requirements satisfied. What is Session Protocol?Session logs document agent work sessions and must comply with RFC 2119 requirements:
See .agents/SESSION-PROTOCOL.md for full specification. Compliance Summary
Detailed Validation ResultsClick each session to see the complete validation report with specific requirement failures. 📄 sessions-2026-01-17-session-02-adr-042-python-migration✨ Zero-Token ValidationThis validation uses deterministic PowerShell script analysis instead of AI:
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AI Quality Gate ReviewTip ✅ Final Verdict: PASS WalkthroughThis PR was reviewed by six AI agents in parallel, analyzing different aspects of the changes:
Review Summary
💡 Quick Access: Click on individual agent jobs (e.g., "🔒 security Review", "🧪 qa Review") in the workflow run to see detailed findings and step summaries. Security Review DetailsSecurity Review: PR #963PR Type Classification
Classification: DOCS-only PR with one CONFIG file (session log) Findings
Analysis Summary
RecommendationsNone. This PR contains only architecture decision records and review artifacts. VerdictQA Review DetailsBased on my analysis, I can now provide the QA review verdict. QA Review: PR #963Validation Summary
Quality Concerns
Regression Risk Assessment
NotesThis PR establishes architectural governance for language migration. The ADR correctly:
Analyst Review DetailsPR #963 Analyst Review: ADR-042 Python Migration StrategyCode Quality Score
Overall: 4.25/5 Impact Assessment
Findings
Deferred P1 Items (tracked for Phase 1 implementation, not blocking):
Recommendations
VerdictRationale: This PR introduces an architectural decision record with thorough multi-agent review. The breaking change label is accurate (supersedes ADR-005). The decision followed proper governance: 5 agents raised CONCERNS, 1 ACCEPT, with High-Level-Advisor tie-breaker per Disagree-and-Commit protocol. Evidence quality issues (Stack Overflow claim) were corrected before commit. The PR contains only documentation files with no code changes requiring testing. Architect Review DetailsNow I have the full context. Let me review the PR artifacts and provide my architectural assessment. Design Quality Assessment
Overall Design Score: 3.8/5 Architectural Concerns
Breaking Change Assessment
Technical Debt Analysis
ADR Assessment
6-Agent Review ValidationThe PR includes comprehensive multi-agent review artifacts:
Disagree-and-Commit protocol followed. High-Level-Advisor ruling documented. Recommendations
VerdictDevOps Review DetailsBased on the PR description, I can perform the DevOps review. The changed files are: DevOps Review: PR #963PR Scope Detection
All 10 changed files are documentation (ADR documents, critique artifacts, session logs). No workflow files, scripts, actions, or CI/CD configuration affected. Pipeline Impact Assessment
CI/CD Quality Checks
Findings
This PR contains only:
No CI/CD, build, deployment, or infrastructure files are modified. Future DevOps ImplicationsThe ADR-042 decision to migrate from PowerShell to Python will require DevOps work in Phase 1 implementation (deferred per PR description):
These are out of scope for this documentation PR. RecommendationsNone. This is a documentation-only PR with no DevOps impact. Roadmap Review DetailsNow I have sufficient context to provide a strategic roadmap review. Roadmap Review: PR #963 - ADR-042 Python Migration StrategyStrategic Alignment Assessment
Feature Completeness
Impact Analysis
RICE Assessment (Roadmap Agent Validation)
KANO ClassificationMust-Be (transitioning): Python support is becoming table stakes for AI/ML agent platforms. Skill-installer already requires Python 3.10+; governance documents that contradict codebase create friction. Concerns
Recommendations
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Approved - ADR-042 Python migration strategy
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Pull Request
Summary
Migrate ai-agents from PowerShell to Python as primary scripting language over a 12-24 month phased migration period. This ADR formalizes the decision that was effectively made when PR #962 introduced skill-installer (Python 3.10+ prerequisite).
Specification References
.agents/architecture/ADR-042-python-migration-strategy.md.agents/architecture/ADR-005-powershell-only-scripting.mdChanges
Rationale
6-Agent ADR Review Results
Result: Disagree-and-Commit (5 CONCERNS + 1 ACCEPT)
Tie-breaker: High-Level-Advisor
P0 Issues Resolved
P1 Issues Deferred to Phase 1 Implementation
Type of Change
Testing
Agent Review
Security Review
.agents/security/)Other Agent Reviews
Checklist
Related Issues
Related to #962 (skill-installer adoption)
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