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Step 10 of 10 2-3 weeks· advanced

Step 10: Decommission the Desktop Installer

Remove the WinForms installer / ClickOnce deployment. Decommission the build pipeline. Archive code. Run the retro.

What you're doing in this step

After 30+ days of stable web operation, formally retire the desktop client: remove the ClickOnce manifest, decommission the WinForms build pipeline, archive source code, and decommission infrastructure specific to the WinForms client (file shares, on-prem SQL if migrated).

Recommended prompts

Use one of these to do the work in your IDE

Open the template to read it in full. Click Copy prompt to grab it (with your stack values pre-filled where they apply) — then paste into Claude Code, Cursor, or wherever you build.

Primary recommendation 1 day to write

Migration Cutover Runbook

Detailed step-by-step runbook for the actual cutover from legacy to new system, including verification, communication, and rollback.

View template
Template· Template 0.5-1 day

Migration Rollback Plan

Plan recovery procedures for when migrations fail at any stage — from pre-cutover bugs to post-cutover production incidents.

Use this when: Document the rollback path for the formal decommission, in case a critical issue appears in the first 30 days

View template
Recommended skills

Drop these into Claude Code for this phase

Skills auto-trigger on the right kind of request. Install once; they apply to every prompt that fits.

Skill· Skill 5 min setup

Migration Planner Skill

Flagship migration skill that walks Claude Code through audit → strategy → slicing → cutover for any legacy system migration.

claude-code
View skill
Skill· Skill 5 min setup

Documentation Skill

Claude Code skill that generates README, API docs, JSDoc, ADRs, and other docs that match the project's existing voice and depth.

claude-code
View skill
Recommended MCP configs

Wire these tools into Claude Code first

MCP servers give Claude Code direct access to external systems (Jira, browsers, databases). Configure once.

MCP config· MCP config 10 min setup

Azure DevOps MCP for Evoke

Pre-configured Azure DevOps MCP server for Claude Code — work items, repos, PRs, and pipelines from chat.

claude-codemcp
View config
MCP config· MCP config 5 min setup

Filesystem MCP for Evoke

Pre-configured filesystem MCP server for Claude Code — safe, scoped read/write access to project files.

claude-codemcp
View config
MCP config· MCP config 10 min setup

Confluence MCP for Evoke

Pre-configured Atlassian Confluence MCP server for Claude Code — search, read, and write internal documentation pages from chat.

claude-codemcp
View config
When you're done

Verify these in your own work before moving on

This is a checklist for you to mentally tick off in your repo and IDE — the site doesn't track it, you do.

  • WinForms client no longer downloadable
  • Build pipeline for WinForms decommissioned
  • Source code archived
  • Legacy infrastructure decommissioned (compute, DB, file shares, etc.)
  • Post-migration retrospective complete
  • Lessons documented for the next migration
Common pitfalls

What goes wrong at this step

  • Keeping legacy "just in case" — the longer you keep it, the more it accumulates new patches and divergence
  • No retrospective — the next desktop-to-web migration won't benefit
  • Forgetting to decommission infrastructure — VPN, file shares, SQL Server licenses keep costing money
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