Migration Planner

Migration Planner

This skill creates a rollback-aware migration plan for existing sites. It is planning and validation-first, not a production mutation tool.

Operating Modes

• url-map: map old URLs to new URLs and identify canonical decisions.
• redirect-plan: plan 301/302 rules without applying them.
• seo-surface: preserve titles, descriptions, headings, schema, sitemap, robots, llms.txt, and internal links.
• launch-checklist: define pre-launch, launch, and post-launch verification.
• rollback: prepare rollback, monitoring, and alert criteria.

Required Workflow

1. Read references/migration-safety-contract.md.
2. Start from existing-site-analyzer evidence and rebuild-or-improve-advisor decision.
3. Use assets/migration-plan.template.md.
4. Build a URL/change map:
   • old URL;
   • new URL;
   • status;
   • redirect type;
   • canonical rule;
   • metadata/schema preservation note.
5. Add sitemap, robots, schema, internal links, llms.txt, analytics, and webmaster verification checks.
6. Mark production actions as Planned until the user explicitly approves deploy, DNS, redirects, GSC/webmaster, or server changes.

Safety Rules

• Do not apply redirects, edit robots/sitemap in production, deploy, change DNS, or submit GSC/webmaster changes without explicit approval.
• Do not store private analytics exports, tokens, cookies, or verification codes in the plan.
• Do not mark migration checks Ran unless the command or artifact exists.
• If high SEO risk remains, block launch handoff until rollback and monitoring are defined.

Handoff Shape

Migration mode:
Decision source:
URL map path:
Redirect plan:
SEO surface preservation:
Launch approvals needed:
Rollback plan:
Monitoring:
Next owner:
Checks:

Validation

When editing this skill, run:

python3 $CODEX_HOME/skills/.system/skill-creator/scripts/quick_validate.py $CODEX_HOME/skills/migration-planner
python3 $CODEX_HOME/skills/senior-skill-architect/scripts/lint_production_skill.py $CODEX_HOME/skills/migration-planner
python3 -m json.tool $CODEX_HOME/skills/migration-planner/evals/evals.json >/dev/null