duckdb-wasm SKILL.md skillA
duckdb-wasm from rijans/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add rijans/agent-skills/duckdb-wasm@git:20261015.3d802c0Pins git:20261015.3d802c0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- rijans/agent-skills
- Path
skills/duckdb-wasm/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261015.3d802c0, committed Oct 15, 2026
- Size
- 6,423 bytes
- Repository stars
- 2
- License
- MIT
Query Parquet files, run in-browser analytical SQL, and persist databases to OPFS with @duckdb/duckdb-wasm, Web Workers, and Apache Arrow tables. Use for AsyncDuckDB initialization, Vite bundler ?url assets, CDN bundles, registerFileHandle, registerFileURL, and COOP/COEP isolation.
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-Wasm Execute blazing-fast analytical SQL directly inside web browsers using **`@duckdb/duckdb-wasm`**, **Web Workers**, and **Apache Arrow**. Whether you need to query local multi-megabyte Parquet files without server uploads, stream remote columnar datasets via HTTP range requests, or persist full analytical databases locally via the **Origin Private File System (`opfs://`)**, this skill provides production-grade architecture with zero bundler crashes or memory leaks. --- ## When to Use - Running client-side analytical queries over **Parquet, CSV, or Arrow IPC** files without uploading data to a backend server. - Persisting client-side relational analytical data across page reloads using the browser's native **Origin Private File System (`opfs://`)**. - Building zero-install local data exploration tools, interactive BI dashboards, or offline-capable data science interfaces. - Integrating in-browser SQL querying with modern frontend bundlers (**Vite**, **Next.js**, **Webpack**). - Processing streaming or batch query results with zero-copy columnar **Apache Arrow** tables. ## When Not to Use …
Read the whole file at its exact version.
How to install
mdr add rijans/agent-skills/duckdb-wasm@sha256:0480517cabf5b936The line at the top of this page pins the label git:20261015.3d802c0, 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_nhvxwdh6wv2anem3)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 15, 2026.
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 (6423 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
rijans/agent-skills · 2 stars · license MIT · pushed 2026-10-15 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_nhvxwdh6wv2anem3 GET https://markdownregistry.com/api/v1/resolve?ref=rijans/agent-skills/duckdb-wasm GET https://markdownregistry.com/api/v1/blob/0480517cabf5b936605b8b820d8e0061ba3e5bfddc17c7ab12e0dabdec9aeef1
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.