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    Codebase Migration Planner Pro

    1

    Architects and generates technical migration plans with dependency mapping, risk registries, and rollback strategies.

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    Codebase Migration Planner Pro

    Codebase Migration Planner Pro

    Example session with this skill installed

    I need a migration plan to move a Node.js Express API from v14 to v20, switching from CommonJS to ESM and moving from a local MongoDB instance to MongoDB Atlas. I've attached my package.json.

    • Read your context and instructions
    • Compiled the codebase migration planner

    The migration plan for the Express API focuses on the transition to ESM modules and the shift to managed database infrastructure.

    Node.js ESM and MongoDB Atlas Migration Plan

    1. Impact Map

    ComponentCurrentTargetImpactRisk
    RuntimeNode.js v14Node.js v20High (V8 engine changes)Medium
    Module SystemCommonJS (require)ESM (import/export)Critical (Syntax rewrite)High
    DatabaseLocal MongoDBMongoDB AtlasNetwork/Auth changesLow
    Driversmongodb ^3.6.0mongodb ^6.0.0Breaking API changesMedium

    2. Phased Execution

    Phase 1: Infrastructure & Data
    • Task: Provision MongoDB Atlas cluster and configure VPC peering or IP allowlists.
    • Verification: Successful connection test using mongosh from the current production environment.
    • Rollback: Continue pointing to local MongoDB instance.
    Phase 2: Dependency & Module Prep

    Task: Update package.json with "type": "module" and replace __dirname/__filename references with import.meta.url utilities.

    • Task: Upgrade mongodb driver to v6.x and refactor connection logic for new Proimse-based APIs.
    • Verification: npm test passes with experimental ESM loader.
    Phase 3: Incremental Deployment
    • Task: Deploy to staging with Atlas connection string via environment variables.
    • Task: Execute dual-run validation to ensure data consistency between local and Atlas instances.

    3. Breaking Changes Analysis

    Confirmed: require() is not defined in ESM; all internal imports must include file extensions (e.g., ./routes/user.js).

    • Likely: Global variables in Node 14 may behave differently in Node 20's stricter environment.
    • Needs Verification: Middleware compatibility for older Express plugins under ESM.

    Next steps

    1. Run grep -r "require(" . to audit all internal dependency imports.
    2. Initialize the Atlas cluster and capture the SRV connection string.
    3. Update the CI pipeline to test against a Node.js 20 container image.

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    About this skill

    The problem

    Software migrations are high-risk operations often derailed by hidden dependencies, unverified breaking changes, and lack of rollback procedures. Planning manually leads to architectural drift, data loss, or extended downtime when "quick updates" turn into multi-week debugging sessions.

    What it does

    • Generates structured impact maps comparing current and target technology stacks.
    • Identifies critical path dependencies to determine precise migration sequencing.
    • Analyzes source code and manifests to flag specific breaking changes and API risks.
    • Produces phased execution plans with validation criteria and rollback triggers for every stage.
    • Builds technical runbooks for deployment, including canary rollouts and monitoring requirements.

    Why this beats prompting it yourself

    Generic prompts often suggest "updating dependencies" without considering transitive risks or stateful data transitions. This skill enforces a strict discovery-first methodology that separates facts from assumptions and mandates validation criteria for every architectural change.

    Use cases

    • Modernizing legacy monolithic applications into microservices or serverless architectures.
    • Upgrading core frameworks, such as migrating from Vue 2 to Vue 3 or React Class components to Hooks.
    • Transitioning on-premise infrastructure to cloud-native platforms like AWS or Kubernetes.
    • Executing database schema refactors using expand-and-contract patterns to ensure zero downtime.

    Known limitations

    Cannot execute code or perform actual deployments. Requires user-supplied codebase context or manifests to generate project-specific task IDs and file-level recommendations.

    Requires codebase context or manifests for specific plans. Cannot perform actual code execution or deployments. Does not invent business justifications or project timelines.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

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    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before any payment.

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    What's inside

    Frequently Asked Questions

    The skill requires access to your source code context, dependency manifests (like package.json or requirements.txt), and architectural diagrams to generate specific, actionable migration sequences rather than generic advice.

    Unlike general AI prompts, this skill uses a discovery-first methodology that maps transitive dependencies and enforces 'expand-and-contract' patterns, ensuring you have a rollback strategy for every architectural change.

    While the skill is language-agnostic, it excels at complex transitions like legacy monolith-to-microservices refactoring, framework version upgrades (e.g., Vue 2 to 3), and cloud-native infrastructure shifts.

    No, for security and safety, the skill functions as an architect rather than an operator; it provides the technical runbooks and validation criteria for your team to execute manually or via CI/CD.

    You receive the full agentic workflow including the dependency mapping logic, risk registry templates, and phased execution strategy, along with any future logic updates released by the developer.

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