new-migration

A command for creating a new database migration, which is a versioned change to a database's structure or data.

In plain words
What is it for?
Use it to scaffold a new migration using the repository's naming and directory conventions, update test seeds when needed, and verify that migrations can be applied safely.
Why use it?
It preserves existing migrations as append-only files and adds safeguards for access control, authorization, destructive changes, and migration checks.

Command

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/theam/facility/new-migration
Clone the repo
git clone --depth 1 https://github.com/theam/facility
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 276 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 $0.00276
Opus 5 $0.00007 $0.00138
Sonnet 5 $0.00003 $0.00055
Haiku 4.5 $0.00001 $0.00028

Measured 2d ago against content hash 80edd90a7396, 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 2d 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.

packages/cli/modules/database/commands/new-migration.md · 25 lines

What it actually says

Create a new database migration following STANDARD.md's Database section.

  1. Locate the migrations directory (migrations/, supabase/migrations/, db/migrations/, prisma/migrations/ — whichever this repo uses) and follow its existing naming convention (timestamp prefix, snake_case description).
  2. Create a NEW file. Never modify or delete an existing migration — they are append-only; the migrations-immutable guard and the file hooks enforce it.
  3. Safety defaults in the scaffold, adapted to this repo's stack:
    • New tables start closed: enable row/document-level access control where supported, deny by default, grant only the minimum operations.
    • Authorization routes through the repo's shared helper layer — no inline token/claim parsing in policies.
    • Destructive operations (drop, irreversible data rewrites) get a written justification comment and, where the stack supports it, a down path.
  4. If the feature needs realistic data to test, update the seeds in the same change.
  5. Verify: run the repo's migration apply/reset command if one exists, then node guards/run.mjs --only=migrations-immutable.
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. 2d ago First seen · 25 lines · 14 tokens per session scan A 80edd90a7396

Subscribe to this mod's changes

new-migration is a command published in the GitHub repository theam/facility (43 stars, last pushed 4d ago), licensed Apache-2.0. It adds 14 tokens to every session and 276 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 2026-08-30.