duckdb SKILL.md skillA
duckdb from alivirgo/major-ai-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add alivirgo/major-ai-skills/duckdb@git:20261005.2bc0998Pins git:20261005.2bc0998 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- alivirgo/major-ai-skills
- Path
skills/duckdb/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261005.2bc0998, committed Oct 5, 2026
- First version recorded
- Aug 26, 2026
- Size
- 5,105 bytes
- Repository stars
- 2
- License
- MIT
Run embedded OLAP SQL on Parquet/CSV locally; configure memory and thread limits; attach remote files safely; export with COPY; avoid multi-writer locks and treating DuckDB as a production server database.
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
# DuckDB Analytical SQL AI Skill Guide
## Overview & Engine Architecture
DuckDB is an **embedded** columnar OLAP engine: runs in-process (Python/R/JDBC/CLI), vectorized execution, reads **Parquet/CSV/JSON** directly without a server. Ideal for notebooks, CI data checks, and local lake queries—not a substitute for fleet-scale warehouse serving.
```
Parquet/CSV/S3 (httpfs)
-> DuckDB in-process
-> SQL (join/window/aggregate)
-> Arrow/DataFrame / COPY export
Optional .duckdb file for persistent views
```
---
## When to use / when not to
**Use when**
- Ad-hoc SQL on local or lake files; replacing heavy pandas groupbys
- CI validation of datasets (row counts, schema contracts)
- Prototyping transforms before `@dbt` on Snowflake/BigQuery
**Do not use when**
- Many concurrent writers or multi-tenant serving layer needed (`@postgresql`, `@snowflake`)
- Data exceeds single-node RAM without spill tuning—consider `@spark` or warehouse
- Untrusted remote URLs without reviewing `httpfs` credential scope
---
## Operational Capabilities & Agent Directives
…Read the whole file at its exact version.
How to install
mdr add alivirgo/major-ai-skills/duckdb@sha256:86bca7ff1cfa99d0The line at the top of this page pins the label git:20261005.2bc0998, 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_cqyorp5gpab5gsn2)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Aug 26, 2026 and Oct 5, 2026, about one every 20 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261005.2bc0998 latest | 2026-10-05 | 2bc0998 | 5,105 B | A | view · diff |
| git:20260910.c429a71 | 2026-09-10 | c429a71 | 3,168 B | A | view · diff |
| git:20260826.1e28b95 | 2026-08-26 | 1e28b95 | 3,131 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 (5105 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
alivirgo/major-ai-skills · 2 stars · license MIT · pushed 2026-11-05 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_cqyorp5gpab5gsn2 GET https://markdownregistry.com/api/v1/resolve?ref=alivirgo/major-ai-skills/duckdb GET https://markdownregistry.com/api/v1/blob/86bca7ff1cfa99d0f179b5238239891db59069811c1169d68f844fc019c68bb6
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.
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