db

db is an agent for Claude Code from Rune-kit/rune. It costs 30 tokens per session (295 once invoked), scanned A, original, MIT.

A database change reviewer and migration generator. A migration is a recorded database change, with an up script to apply it and a down script to undo it.

In plain words
What is it for?
Use it when changing tables, columns, indexes, or constraints. It can compare schemas, classify breaking changes, generate ORM-specific migrations, suggest indexes, and scan queries for SQL injection risks.
Why use it?
It helps catch database changes that could break existing data or applications before they are applied. It also checks for unsafe SQL patterns, such as inserting user input directly into queries.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the rune plugin — 57 agents shipped together

Good fit Use it when changing tables, columns, indexes, or constraints. It can compare schemas, classify breaking changes, generate ORM-specific migrations, suggest indexes, and scan queries for SQL injection risks.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/rune-kit/rune/db
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.

Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune

Made for: Claude Code.

Or install rune, the plugin that ships this one along with the rest of its 57 agents.

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 db

README.md
[![agentmods](https://agentmods.dev/badge/agents/rune-kit/rune/db/github.svg)](https://agentmods.dev/agents/rune-kit/rune/db)
Your own site
<a href="https://agentmods.dev/agents/rune-kit/rune/db"><img src="https://agentmods.dev/badge/agents/rune-kit/rune/db/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for db

Your own site · 80×15
<a href="https://agentmods.dev/agents/rune-kit/rune/db"><img src="https://agentmods.dev/badge/agents/rune-kit/rune/db.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 295 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00030 $0.00295
Opus 5.5 $0.00012 $0.00118
Sonnet 5.5 $0.00006 $0.00059
Haiku 4.5 $0.00003 $0.00030

Measured 1mo ago against content hash 8f1761b249a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

db 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 1mo 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.

agents/db.md · 27 lines

What it actually says

You are the db skill — Rune's database change management specialist.

Quick Reference

Workflow:

  1. Discovery — scout finds schema files, migrations, ORM (Prisma/TypeORM/SQLAlchemy/Django/raw SQL)
  2. Diff Analysis — list added/removed/modified columns, tables, indexes, constraints
  3. Breaking Change Detection — classify: BREAKING (NOT NULL without DEFAULT, DROP COLUMN, rename, type change) vs SAFE (nullable column, ADD TABLE, ADD INDEX)
  4. Migration Generation — per ORM format with both UP and DOWN scripts
  5. Index Analysis — flag missing indexes on FK, high-cardinality WHERE, composite, sort ops
  6. Query Parameterization Scan — detect SQL injection risk (string interpolation)
  7. Report — schema changes, breaking changes, migration files, index recs, verdict

Hard Gates:

  • ADD NOT NULL without DEFAULT → BLOCKED
  • Column rename or type change → BREAKING, requires explicit confirmation
  • Empty rollback/down() function → BLOCKED (never write empty down())

Read skills/db/SKILL.md for the full specification.

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. 1mo ago First seen · 27 lines · 30 tokens per session scan A 8f1761b249a6

Subscribe to this mod's changes

db is an agent published in the GitHub repository Rune-kit/rune (86 stars, last pushed 2mo ago), licensed MIT. It adds 30 tokens to every session and 295 once invoked, about $0.0001 per session on Opus 5.5. 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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