{"type":"post","id":"claude-plugins-official-plugins-code-modernization-readme-md-000530","slug":"claude-plugins-official-plugins-code-modernization-readme-md-000530","title":"claude-plugins-official/plugins/code-modernization/README.md at main | anthropics/claude-plugins-official","description":"Thesis: Legacy-code modernization becomes more operationally credible when transformation is paired with a separate, inspectable behavioral verification step.","retrieval_nugget":"Thesis: Legacy-code modernization becomes more operationally credible when transformation is paired with a separate, inspectable behavioral verification step.","published_at":"2026-10-14","updated_at":"2026-10-14","record_date":"2026-10-14","date_kind":"published_at","topics":[],"source_urls":["https://github.com/anthropics/claude-plugins-official/blob/main/plugins/code-modernization/README.md"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:claude-plugins-official-plugins-code-modernization-readme-md-000530","status":"published","visuals":[],"editorial_provenance":{"schema_version":"newruntime-editorial-copy-v1","content_status":"source_grounded_final","final_copy_sha256":"sha256:ffc932d88d4ac02ff7f21363d42e7b2d60279d1c8f04180641a7e14ed1c710f1","reviewed_at":"2026-10-14T08:02:53.104Z","source_evidence_count":1,"verified_claim_count":3,"site_analysis_schema_version":"newruntime-site-analysis-v1","site_object_kind":"field_note","observed_fact_count":3,"implication_count":2,"watch_condition_count":1,"related_record_count":0},"analysis":{"schema_version":"newruntime-site-analysis-v1","object_kind":"field_note","thesis":"Legacy-code modernization becomes more operationally credible when transformation is paired with a separate, inspectable behavioral verification step.","observed_facts":[{"text":"The README lists a workflow from assessment and mapping through reviewed business rules, plan approval, modernization, and verification.","source_urls":["https://github.com/anthropics/claude-plugins-official/blob/main/plugins/code-modernization/README.md"]},{"text":"The README says verification reruns tests from a clean build and compares old and new outputs on the same inputs where the legacy code can run.","source_urls":["https://github.com/anthropics/claude-plugins-official/blob/main/plugins/code-modernization/README.md"]},{"text":"The README says the legacy source is not edited and identifies separate analysis and modernized directories.","source_urls":["https://github.com/anthropics/claude-plugins-official/blob/main/plugins/code-modernization/README.md"]}],"mechanism":"The plugin makes a post-build verification step rerun tests and compare old and new implementations on shared inputs, with listed masks and recorded accepted differences.","why_now":"The plugin makes verification a named stage in an AI-assisted modernization workflow rather than relying on the model’s assertion that a rewrite is correct.","implications":["Teams evaluating AI-assisted migration can assess the verification artifacts and human checkpoints, not just the generated code.","The documented process still depends on buildability, representative inputs, and human decisions; the README does not establish success rates."],"evidence_boundary":"The public README describes product behavior and intended process, but supplies no independent benchmark or outcome data, and explicitly leaves key decisions to people.","watch_conditions":["Watch for published examples showing whether the comparison and test evidence catches meaningful regressions on real migrations."],"related_records":[],"new_branch_reason":"No prior New Runtime record was supplied; this is a distinct plugin release centered on legacy modernization and behavioral verification."},"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/claude-plugins-official-plugins-code-modernization-readme-md-000530/","markdown":"https://newruntime.com/posts/claude-plugins-official-plugins-code-modernization-readme-md-000530.md","json":"https://newruntime.com/posts/claude-plugins-official-plugins-code-modernization-readme-md-000530.json"},"next_reads":[{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}