new-migration

new-migration is a command for Claude Code from fschifone/claude-setup-wizard. It costs 14 tokens per session (313 once invoked), scanned A, original, MIT.

A command for creating an Alembic database migration, which is a tracked change to a database’s structure, from differences detected in the code.

In plain words
What is it for?
Use it when adding or changing database tables or columns; it checks for destructive changes, unsafe required fields, missing rollback code, and empty migrations.
Why use it?
It helps review schema changes and identify risky operations before they are applied, while leaving the decision to update the database to the user.

Command for Claude Code

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 commands/fschifone/claude-setup-wizard/new-migration
Clone the repo
git clone --depth 1 https://github.com/fschifone/claude-setup-wizard

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for new-migration

README.md
[![agentmods](https://agentmods.dev/badge/commands/fschifone/claude-setup-wizard/new-migration.svg)](https://agentmods.dev/commands/fschifone/claude-setup-wizard/new-migration)
Your own site
<a href="https://agentmods.dev/commands/fschifone/claude-setup-wizard/new-migration"><img src="https://agentmods.dev/badge/commands/fschifone/claude-setup-wizard/new-migration.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 313 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 $0.00014 $0.00313
Opus 5 $0.00007 $0.00156
Sonnet 5 $0.00003 $0.00063
Haiku 4.5 $0.00001 $0.00031

Measured 4d ago against content hash e341200af6b2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

new-migration 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 4d 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.

examples/sample-output/.claude/commands/new-migration.md · 34 lines

What it actually says

New migration

Create a new Alembic migration, review the auto-generated diff, and flag any risky operations before the user commits.

When to use

Run /new-migration "add orders.fulfilled_at column" whenever a schema change is needed. The argument becomes the migration's description.

Steps

  1. Verify the working tree is clean (warn but don't block if not).
  2. Run uv run alembic revision --autogenerate -m "$ARGUMENTS".
  3. Read the generated file under backend/alembic/versions/.
  4. Scan for risky operations:
    • DROP TABLE / DROP COLUMN → flag as destructive.
    • ALTER COLUMN ... NOT NULL without a default → flag as blocking on existing data.
    • Missing downgrade() body → flag.
  5. Report findings. Do NOT auto-apply the migration.

Guardrails

  • Never run alembic upgrade head automatically — user decides when.
  • Never delete a migration file; if rollback is needed, tell the user to remove it manually.
  • If the diff is empty, delete the empty revision file and inform the user that no schema changes were detected.
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. 4d ago First seen · 34 lines · 14 tokens per session scan A e341200af6b2

Subscribe to this mod's changes

new-migration is a command published in the GitHub repository fschifone/claude-setup-wizard (2 stars, last pushed 4mo ago), licensed MIT. It adds 14 tokens to every session and 313 once invoked, about $0.0001 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 2026-08-31.