Borrowing it
Nothing to install: this file belongs to niels-emmer/myace. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/niels-emmer/myace/main/.opencode/commands/add-migration.mdgit clone --depth 1 https://github.com/niels-emmer/myaceWrote 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.
[](https://agentmods.dev/commands/niels-emmer/myace/add-migration)<a href="https://agentmods.dev/commands/niels-emmer/myace/add-migration"><img src="https://agentmods.dev/badge/commands/niels-emmer/myace/add-migration.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00012 | $0.00197 |
| Opus 5 | $0.00006 | $0.00098 |
| Sonnet 5 | $0.00002 | $0.00039 |
| Haiku 4.5 | $0.00001 | $0.00020 |
Grade A, and why
add-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 8d 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.
What it actually says
Create a new Alembic migration for the MyACE backend.
Usage: /add-migration <description>
Steps:
- Ensure the dev stack is running:
docker compose -f docker-compose.yml -f docker-compose.dev.yml ps - Generate the migration:
docker compose exec backend alembic revision --autogenerate -m "<description>" - Review the generated file in
backend/alembic/versions/ - Apply it:
docker compose exec backend alembic upgrade head - Verify the migration has a working
downgrade()function - Name migrations descriptively (e.g.,
add_profile_visibility_column)
Rules:
- Every schema change requires an Alembic migration
- Migrations must be reversible (
downgrade()defined) - Never modify a committed migration — create a new one
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.
- 8d ago First seen · 22 lines · 12 tokens per session scan A 6308ac8cd8fc
add-migration is a command published in the GitHub repository niels-emmer/myace (1 stars, last pushed yesterday), licensed MIT. It adds 12 tokens to every session and 197 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.
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