Phase 0: Agents in Production · 30 hours · Python (agent) · Java / Python (targets) · TypeScript (dashboard)

Capstone 09 — Code Migration Agent (Repo-Level Language / Runtime Upgrade)

Amazon's MigrationBench (Java 8 to 17) and Google's App Engine Py2-to-Py3 migrator set the 2026 bar.

Hiring signal: Can build capstone 09 end to end

Introduction

Moderne's OpenRewrite does deterministic AST rewrites at scale. Grit targets the same problem with codemod-style DSL. The production pattern combines both: a deterministic substrate for safe rewrites plus an agent layer for the ambiguous cases, a sandbox for per-branch builds, and a test harness that flips green before the PR opens. The capstone is to migrate 50 real repos and publish a pass rate with a failure taxonomy.

Phases exercised: P5 · P7 · P11 · P13 · P14 · P15 · P17

Type: Capstone Languages: Python (agent), Java / Python (targets), TypeScript (dashboard) Prerequisites: Phase 5 (NLP), Phase 7 (transformers), Phase 11 (LLM engineering), Phase 13 (tools), Phase 14 (agents), Phase 15 (autonomous), Phase 17 (infrastructure) Time: 30 hours

Objective

Learning objectives

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Key terms in this lesson

Agent