Code Migration Planner
Architect safe, staged code migrations with zero-downtime patterns and automated rollback gates.
- Design zero-downtime database schema migrations using dual-write patterns
- Plan incremental transitions from legacy frameworks to modern stacks
- Apply the Strangler Fig pattern to decommission monoliths safely
$9.99
· or 50 creditsSecure checkout via Stripe
Included in download
- Design zero-downtime database schema migrations using dual-write patterns
- Plan incremental transitions from legacy frameworks to modern stacks
- Ready for Cursor
Sample input
We need to migrate our Express.js monolith to a Go microservice architecture. It's a high-traffic API. How do we start without downtime?
Sample output
Phase 1: Proxy Verification.
- Risk: Network overhead and latency spikes.
- Action: Deploy a Go reverse proxy (Strangler Fig) in front of Express.
- Gate: If latency > 50ms at p99, rollback to direct ELB routing.
- Step 2: Implement a 'dual-write' bridge for the Auth service...
Architect safe, staged code migrations with zero-downtime patterns and automated rollback gates.
$9.99
· or 50 creditsSecure checkout via Stripe
Included in download
- Design zero-downtime database schema migrations using dual-write patterns
- Plan incremental transitions from legacy frameworks to modern stacks
- Ready for Cursor
- Instant install
Sample input
We need to migrate our Express.js monolith to a Go microservice architecture. It's a high-traffic API. How do we start without downtime?
Sample output
Phase 1: Proxy Verification.
- Risk: Network overhead and latency spikes.
- Action: Deploy a Go reverse proxy (Strangler Fig) in front of Express.
- Gate: If latency > 50ms at p99, rollback to direct ELB routing.
- Step 2: Implement a 'dual-write' bridge for the Auth service...
About This Skill
What it does
The Code Migration Planner is a specialized architect-level skill designed to de-risk complex codebase transitions. It moves beyond simple refactoring by generating staged, incremental migration plans that eliminate "big-bang" deployments. Whether you are moving from Python 2 to 3, transitioning a monolith to microservices, or porting a legacy JS app to TypeScript, this skill structures the move using industry-standard patterns like the Strangler Fig and Dual-Writing.
Why use this skill
Typical AI prompts often suggest "replacing X with Y," which leads to long-lived feature branches and integration nightmares. This skill enforces a "shippable main" philosophy. It identifies the riskiest assumptions first and mandates rollback gates for every phase. By using this skill, you ensure that your migration is reversible, verifiable, and continuously integrated into your production environment.
Key Features
- Risk-First Sequencing: Prioritizes the most volatile components to prove feasibility early.
- Strangler Fig Design: Defines clear boundaries to migrate functionality bit-by-bit.
- Verification Phases: Implements dual-write and comparison logic to ensure data integrity.
- Feature Flag Routing: Uses flags to manage traffic between old and new implementations.
- Operational Safety: Defines explicit rollback criteria and "shippable main" constraints for every PR.
Use Cases
- Design zero-downtime database schema migrations using dual-write patterns
- Plan incremental transitions from legacy frameworks to modern stacks
- Apply the Strangler Fig pattern to decommission monoliths safely
- Establish rollback gates and verification criteria for major version upgrades
Known Limitations
- Cannot execute code or run migrations directly.
- Requires team discipline to avoid long-lived branches.
- Success depends on existing CI/CD maturity.
How to Install
mkdir -p ~/.claude/skills && curl -sL https://www.agensi.io/api/install/code-migration-planner -o /tmp/code-migration-planner.zip && unzip -o /tmp/code-migration-planner.zip -d ~/.claude/skills && rm /tmp/code-migration-planner.zipFree skills install directly. Paid skills require purchase - use the download button above after buying.
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Compatible with SKILL.md-compatible agents including Claude Code, Cursor, and Aider.
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