database-index-design SKILL.md skillA
database-index-design from robsonkades/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add robsonkades/agent-skills/database-index-design@git:20261016.c769bd8Pins git:20261016.c769bd8 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- robsonkades/agent-skills
- Path
skills/database-index-design/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261016.c769bd8, committed Oct 16, 2026
- First version recorded
- Sep 6, 2026
- Size
- 8,270 bytes
- Repository stars
- 3
- License
- Apache-2.0
Designing and governing an index portfolio across SQL Server, MySQL/InnoDB, and PostgreSQL: deriving composite keys from a workload, equality/range/order trade-offs, covering and partial indexes, write amplification, redundant-index consolidation, engine-specific semantics, and safe production creation or removal. Use when changing schema indexes for several queries or reviewing a table's index set. Not the diagnosis of one slow statement, which belongs to sql-query-performance.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Database Index Design ## Purpose Choose an index set that supports the measured workload at justified write, storage, locking, maintenance, and rollout cost. Retain an adequate portfolio; fewer indexes can still cost more if consolidation widens keys or loses useful access paths. This skill owns the portfolio and DDL decision; `sql-query-performance` owns reading one statement's executed plan. ## Required inputs ```text engine, exact version/edition, table shape, row count, and growth: representative query workload with frequency and tail parameter distributions: equality, range, join, ordering, projection, and uniqueness requirements per query: current indexes, constraints, usage window, write/update rate, and replica roles: executed plans and actual work for the target statements: DDL availability, lock, log/WAL, disk, rollback, and maintenance constraints: ``` Inspect existing schema/migrations, captured plans and usage windows before asking for new evidence. If the workload or engine is unknown, do not emit DDL; identify the missing decision input. Estimated plans can support candidates when actuals are unavailable, with runtime benefit explicitly unverified. …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/database-index-design@sha256:4a64758100f3fd19The line at the top of this page pins the label git:20261016.c769bd8, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_s7d45cuxod53upgu)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 6, 2026 and Oct 16, 2026, about one every 10 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261016.c769bd8 latest | 2026-10-16 | c769bd8 | 8,270 B | A | view · diff |
| git:20260927.9ecadfd | 2026-09-27 | 9ecadfd | 8,060 B | A | view · diff |
| git:20260923.832673e | 2026-09-23 | 832673e | 7,762 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 7,601 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 6,259 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8270 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
robsonkades/agent-skills · 3 stars · license Apache-2.0 · pushed 2026-10-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_s7d45cuxod53upgu GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/database-index-design GET https://markdownregistry.com/api/v1/blob/4a64758100f3fd1950822a0edd0f9b3f84454a4c1ae8cbfff348ab5a45eba888
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.