hldb

hldb is a skill for Claude Code, Codex from aizhangdeshuai-cmd/hlskills. It costs 76 tokens per session (655 once invoked), scanned A, original, no licence file.

Database-migration rules covering safe schema changes, meaning changes to tables and fields, as well as plans for updating data without taking a service offline.

In plain words
What is it for?
Use it to design or review migrations, plan reversible UP and DOWN steps, update data in batches, and apply expand-and-contract changes for zero-downtime releases.
Why use it?
It helps prevent risky migrations, such as changing deployed migration files, mixing table changes with data updates, or locking a live database during large operations.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it to design or review migrations, plan reversible UP and DOWN steps, update data in batches, and apply expand-and-contract changes for zero-downtime releases.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/aizhangdeshuai-cmd/hlskills/hldb
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.

Any agent
npx skills add aizhangdeshuai-cmd/hlskills --skill hldb
Clone the repo
git clone --depth 1 https://github.com/aizhangdeshuai-cmd/hlskills

Made for: Claude Code, Codex.

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 hldb

README.md
[![agentmods](https://agentmods.dev/badge/skills/aizhangdeshuai-cmd/hlskills/hldb/github.svg)](https://agentmods.dev/skills/aizhangdeshuai-cmd/hlskills/hldb)
Your own site
<a href="https://agentmods.dev/skills/aizhangdeshuai-cmd/hlskills/hldb"><img src="https://agentmods.dev/badge/skills/aizhangdeshuai-cmd/hlskills/hldb/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 hldb

Your own site · 80×15
<a href="https://agentmods.dev/skills/aizhangdeshuai-cmd/hlskills/hldb"><img src="https://agentmods.dev/badge/skills/aizhangdeshuai-cmd/hlskills/hldb.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 655 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 unknown 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 $0.00076 $0.00655
Opus 5 $0.00038 $0.00328
Sonnet 5 $0.00015 $0.00131
Haiku 4.5 $0.00008 $0.00065

Measured 9d ago against content hash 1bed05ef114c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

hldb 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 9d 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.

hldb/SKILL.md · 72 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 9d ago First seen · 72 lines · 76 tokens per session scan A 1bed05ef114c

Subscribe to this mod's changes

hldb is a skill published in the GitHub repository aizhangdeshuai-cmd/hlskills (2 stars, last pushed 25d ago), with no licence file. It adds 76 tokens to every session and 655 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 2026-08-31.

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