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By agent · Codex

Codex skills: 1008 worth installing

Skills in the open SKILL.md format that Codex reads. Each one has a plain-language summary and the command to install it.

Installing a skill in Codex

$ npx skills add <author>/<skill> --agent codex

Replace the placeholder with the author and skill name from the skill's page. Start a new Codex session afterwards so the skill is picked up.

Skills for Codex

All skills

Marketing Video

Corey Haines

Produces marketing video with AI tools and programmatic frameworks such as Remotion, Hyperframes, HeyGen and Veo.

Video and mediaGitHub stars: 52.1kInstalls: 75k

Defuddle

Steph Ango

Extracts clean Markdown from HTML pages with the Defuddle CLI.

DataGitHub stars: 49.1kInstalls: 70.7k

JSON Canvas

Steph Ango

Creates and edits JSON Canvas files (.canvas) with nodes, edges and groups, for visual canvases and mind maps in Obsidian.

ProductivityGitHub stars: 49.1kInstalls: 70.9k

Knap

Steph Ango

Renders Markdown notes from templates and structured data such as JSON or CSV with the Knap CLI.

ProductivityGitHub stars: 49.1kInstalls: 2.1k

Obsidian Bases

Steph Ango

Creates and edits Obsidian Bases (.base files) with views, filters, formulas and summaries.

ProductivityGitHub stars: 49.1kInstalls: 76k

Obsidian CLI

Steph Ango

Reads, creates, searches and manages notes in an Obsidian vault through the Obsidian CLI, and helps with plugin development.

ProductivityGitHub stars: 49.1kInstalls: 77.2k

Writes Obsidian Flavored Markdown with wikilinks, embeds, callouts and properties.

WritingGitHub stars: 49.1kInstalls: 88.2k

Biopython

K-Dense

Molecular biology toolkit: sequence manipulation, FASTA, GenBank and PDB parsing, phylogenetics and NCBI access.

DataGitHub stars: 47.3kInstalls: 1.7k

Searches OpenAlex, PubMed and Google Scholar for papers, validates citations and generates BibTeX entries.

ResearchGitHub stars: 47.3kInstalls: 1.9k

Designs experiments and studies before data collection: choice of design, randomisation, blocking and treatment layout.

ResearchGitHub stars: 47.3kInstalls: 1.1k

Runs exploratory analysis on scientific data files: profiles, missing-data audits and outlier checks.

DataGitHub stars: 47.3kInstalls: 1.9k

Turns observations into testable scientific hypotheses with rival explanations, predictions and an analysis plan.

ResearchGitHub stars: 47.3kInstalls: 1.8k

Creates research posters in LaTeX with beamerposter, tikzposter or baposter.

DocumentsGitHub stars: 47.3kInstalls: 1.8k

Literature Review

K-DenseAudit warning

Conducts systematic literature reviews across PubMed, arXiv, bioRxiv, Semantic Scholar and other academic databases.

ResearchGitHub stars: 47.3kInstalls: 2k

Builds market research reports with traceable evidence, competitive landscapes and TAM, SAM and SOM sizing.

ResearchGitHub stars: 47.3kInstalls: 1.7k

MarkItDown

K-Dense

Converts Office files, PDFs and other documents to Markdown with Microsoft MarkItDown, for analysis and RAG ingestion.

DocumentsGitHub stars: 47.3kInstalls: 1.9k

Matplotlib

K-Dense

Reference for Matplotlib: fine-grained control over plot elements and export to PNG, PDF or SVG for publication.

DataGitHub stars: 47.3kInstalls: 1.9k

NetworkX

K-Dense

Creates, analyses and visualises networks and graphs in Python with NetworkX.

DataGitHub stars: 47.3kInstalls: 1.8k

Prepares constructive peer-review drafts and structured assessments of scientific manuscripts and proposals.

ResearchGitHub stars: 47.3kInstalls: 1.9k

Polars

K-Dense

Reference for Polars, the Python DataFrame library: expressions, lazy queries, streaming and migration from pandas.

DataGitHub stars: 47.3kInstalls: 1.8k

PyMC

K-Dense

Builds Bayesian models with PyMC: hierarchical models, MCMC, variational inference and model comparison.

DataGitHub stars: 47.3kInstalls: 1.7k

RDKit

K-Dense

Cheminformatics with RDKit: SMILES parsing, molecular descriptors, fingerprints, substructure search and reactions.

DataGitHub stars: 47.3kInstalls: 1.7k

Writes research proposals for NSF, NIH, DOE and DARPA, with agency-specific formatting, review criteria and budgets.

WritingGitHub stars: 47.3kInstalls: 1.8k

Gathers current scholarly evidence, references and competing findings for a manuscript or research brief.

ResearchGitHub stars: 47.3kInstalls: 1.7k

Questions

Codex and skills.

Do Claude skills work in Codex?

Often. A skill is a folder of instructions and scripts in the open SKILL.md format, which Codex reads. A skill that depends on tools only one agent provides will not carry over, so read the skill's source before you rely on it.

How do I install a skill in Codex?

Each skill page has an install command. Run it in a terminal, then start a new Codex session so the skill is picked up.

What is the difference between a skill and an instructions file such as AGENTS.md?

An instructions file is loaded in every session and describes the project. A skill is loaded only when a task calls for it, so it can be long and specific without costing context on every turn.

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