migrate

A guided workflow for database schema changes with EF Core, .NET version upgrades, and NuGet package updates. EF Core is the .NET tool that maps application objects to database tables, while NuGet is .NET's package system.

In plain words
What is it for?
It helps create and review database migrations, check for data loss or locking, upgrade .NET, update packages, and verify each step.
Why use it?
It reduces migration and upgrade risk by requiring review, testing, and a rollback plan for each logical change.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/codewithmukesh/dotnet-claude-kit/migrate
Any agent
npx skills add codewithmukesh/dotnet-claude-kit --skill migrate
Clone the repo
git clone --depth 1 https://github.com/codewithmukesh/dotnet-claude-kit

Made for: Claude Code, Codex.

Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,611 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00082 $0.01611
Opus 5 $0.00041 $0.00805
Sonnet 5 $0.00016 $0.00322
Haiku 4.5 $0.00008 $0.00161

Measured 3d ago against content hash 2bb388a1e0ca, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

migrate scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/migrate/SKILL.md · 183 lines

How it starts

The opening of the file, as written. The whole thing — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/migrate

What

The single migration workflow for three change types, with EF Core schema migrations as the primary flow:

  1. EF Core schema — review pending model changes, generate a descriptively named migration, review the SQL for data loss and locking risks, apply with a documented rollback path.
  2. .NET version upgrade — phased TFM/SDK/package upgrade with verification at each phase.
  3. NuGet updates — incremental, one-package-at-a-time updates so breakage is always attributable.

Shared principles: verify before applying, rollback plan always, test after every step, one logical change per migration.

When

  • After modifying entity classes, DbContext configuration, or relationships
  • "add migration", "update database", "create migration", "new table", "rename column"
  • When generating SQL scripts for DBA review
  • "upgrade to .NET 10", "version upgrade", ".NET upgrade"
  • "upgrade nuget", "update packages", "dependency update", vulnerable package alerts

How

First, classify the request: schema change → Flow A; framework upgrade → Flow B; package update → Flow C. Then follow that flow end to end.

Flow A: EF Core Schema Migration (primary)

Step 1: Assess current state

dotnet ef migrations list --project <InfraProject> --startup-project <ApiProject>

Check for pending migrations and uncaptured model changes.

Step 2: Review model changes

Use MCP tools instead of reading whole files:

find_symbol(name: entity or DbSet)        -- locate the changed entity
get_type_hierarchy(typeName: entity)      -- check TPH/TPT/TPC inheritance changes
find_references(symbolName: property)     -- assess downstream query impact

Confirm the change is one logical unit. If not, split into multiple migrations — mixed migrations make rollback all-or-nothing.

Step 3: Generate migration

Name describes the change, not the entity: Add|Remove|Rename|Modify + WhatChanged.

# GOOD
dotnet ef migrations add AddOrderShippingAddress --project <Infra> --startup-project <Api>
# BAD — names the entity, not the change
dotnet ef migrations add Order

Read the full file on GitHub · 183 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 183 lines · 82 tokens per session scan A 2bb388a1e0ca

Subscribe to this mod's changes

migrate is a skill published in the GitHub repository codewithmukesh/dotnet-claude-kit (689 stars, last pushed 26d ago), licensed MIT. It adds 82 tokens to every session and 1,611 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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