Paths: File paths ( shared/ , references/ , ../ln- ) are relative to skills repo root. If not found at CWD, locate this SKILL.md directory and go up one level for repo root. ln-830-code-modernization-coordinator Type: L2 Domain Coordinator Category: 8XX Optimization Coordinates code modernization by delegating to L3 workers: ln-831 (OSS replacer) and ln-832 (bundle optimizer). Executes migration plans from 6XX audit findings. Overview Aspect Details Input Audit report (ln-645 migration plan) OR target module Output Modernized codebase with verification proof Workers ln-831 (OSS replacer), ln-832 (bundle optimizer) Workflow Phases: Pre-flight → Analyze Input → Delegate → Collect → Verify → Report Phase 0: Pre-flight Checks Check Required Action if Missing Audit report OR target module Yes Block modernization Git clean state Yes Block (need clean baseline for revert) Test infrastructure Yes Block (workers need tests for keep/discard) MANDATORY READ: Load shared/references/ci_tool_detection.md for test/build detection. Phase 1: Analyze Input Worker Selection Condition ln-831 ln-832 ln-645 findings present (OSS candidates) Yes No JS/TS project with package.json No Yes Both conditions Yes Yes Target module specified Yes No Stack Detection Indicator Stack ln-832 Eligible package.json + JS/TS files JS/TS Yes .csproj .NET No requirements.txt / pyproject.toml Python No go.mod Go No Phase 2: Delegate to Workers CRITICAL: All delegations use Agent tool with subagent_type: "general-purpose" and isolation: "worktree" — each worker creates its own branch per shared/references/git_worktree_fallback.md . Delegation Protocol FOR each selected worker: Agent(description: "Modernize via ln-83X", prompt: "Execute modernization worker. Step 1: Invoke worker: Skill(skill: \"ln-83X-{worker}\") CONTEXT: {delegationContext}", subagent_type: "general-purpose", isolation: "worktree") Delegation Context Field Type Description projectPath string Absolute path to project auditReport string Path to codebase_audit.md (if applicable) targetModule string Target module path (if applicable) options.runTests bool Run tests after modernization Execution Order Order Worker Reason 1 ln-831 (OSS replacer) May add/remove packages, affecting bundle 2 ln-832 (bundle optimizer) Runs AFTER package changes are settled Rules: Workers run sequentially — ln-831 package changes affect ln-832 baseline. Dependent workers share branch: ln-832 launches in ln-831's branch so it sees OSS replacement changes. Phase 3: Collect Results Each worker produces an isolated branch. Coordinator aggregates branch reports. Worker Branches Worker Branch Pattern Contents ln-831 modernize/ln-831-{module}-{ts} OSS replacements ln-832 modernize/ln-832-bundle-{ts} Bundle optimizations Result Schema Field Type Description worker string ln-831 or ln-832 status enum success, partial, failed branch string Worker's result branch name changes_applied int Number of kept changes changes_discarded int Number of discarded attempts details object Worker-specific report Phase 4: Aggregate Reports Each worker verified independently in its branch (tests, build run by worker itself). Coordinator does NOT rerun verification or revert worker changes. On Failure Branch with failing tests logged as "failed" in report User reviews failed branch independently Phase 5: Report Summary Report Schema Field Description input_source Audit report or target module workers_activated Which workers ran modules_replaced OSS replacements applied (ln-831) loc_removed Custom code lines removed (ln-831) bundle_reduction Bundle size reduction in bytes/% (ln-832) build_verified PASSED or FAILED per_worker[] Individual worker reports Configuration Options :

Input

audit_report : "docs/project/codebase_audit.md" target_module : ""

Workers

enable_oss_replacer : true enable_bundle_optimizer : true

Verification

run_tests : true run_build : true

Safety

revert_on_build_failure : true Error Handling Recoverable Errors Error Recovery ln-831 failure Continue with ln-832 ln-832 failure Report partial success (ln-831 results valid) Build failure Revert last worker, re-verify Fatal Errors Error Action No workers activated Report "no modernization targets found" All workers failed Report failures, suggest manual review Dirty git state Block with "commit or stash changes first" References ../ln-831-oss-replacer/SKILL.md ../ln-832-bundle-optimizer/SKILL.md ../ln-645-open-source-replacer/SKILL.md (audit companion) shared/references/ci_tool_detection.md Definition of Done Input analyzed (audit report or target module) Appropriate workers selected based on input and stack Workers delegated with worktree isolation ( isolation: "worktree" , ln-831 before ln-832) Each worker produces isolated branch, pushed to remote Coordinator report aggregates per-worker results (branch, changes, status) Phase 6: Meta-Analysis MANDATORY READ: Load shared/references/meta_analysis_protocol.md Skill type: optimization-coordinator . Run after all phases complete. Output to chat using the optimization-coordinator format. Version: 1.0.0 Last Updated: 2026-03-08