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Top 23 Python YAML Projects
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Anthropic-Cybersecurity-Skills
754 structured cybersecurity skills for AI agents · Mapped to 5 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND & NIST AI RMF · agentskills.io standard · Works with Claude Code, GitHub Copilot, Codex CLI, Cursor, Gemini CLI & 20+ platforms · 26 security domains · Apache 2.0
The GitHub Trending board today corroborates this. Of the top fifteen repos, at least four are explicitly Skills-targeted: multica-ai/andrej-karpathy-skills (154K stars), affaan-m/ECC (192K stars), mukul975/Anthropic-Cybersecurity-Skills (9K), and the broader multica-ai/multica managed-agents platform.
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jc
CLI tool and python library that converts the output of popular command-line tools, file-types, and common strings to JSON, YAML, or Dictionaries. This allows piping of output to tools like jq and simplifying automation scripts.
I guess I don't see those as big downsides because I don't think people usually want binary data or quoted strings back from a CLI command, nor do they want column oriented output, nor "user friendly" tables.
Answering --help with JSON is a good example, how bad is it really if the response is JSON? Well, using less works fine still and you can still grep if you want simple substring search. Wanting a section is probably more common, so maybe you'd "grep" for a subcommand with `jq .subcommand` or an option with `jq .subcommand.option`. Tables and tab-or-space delimited output overflow char limits, force the command-generator to figure out character wrapping, and so on. Now you need a library to generate CLI help properly, but if you're going to have a library why not just spit JSON and decouple completely from display details.
Structured output by default just makes sense for practically everything except `cat`. And while your markdown files or csv files might have quoted strings, looking at the raw files isn't something people really want from shells or editors.. they want something "rendered" in one way or another, for example with syntax highlighting.
Basically in 2025 neither humans nor machines benefit much from unstructured raw output. Almost any CLI that does this needs to be paired with a parser (like https://github.com/kellyjonbrazil/jc) and/or a renderer (like https://github.com/charmbracelet/glow). If no such pairing is available then it pushes many people to separately reinvent parsers badly. JSON's not perfect but (non-minified) it's human-readable enough to address the basic issues here without jumping all the way towards binary or (shudder) HTML
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datamodel-code-generator
Python data model generator (Pydantic, dataclasses, TypedDict, msgspec) from OpenAPI, JSON Schema, GraphQL, and raw data (JSON/YAML/CSV).
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msgspec
A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML (by msgspec)
Project mention: msgspec VS ctxure - a user suggested alternative | libhunt.com/r/msgspec/msgspec | 2026-06-05 -
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python-benedict
:blue_book: dict subclass with keylist/keypath support, built-in I/O operations (base64, csv, html, ini, json, pickle, plist, query-string, toml, xls, xml, yaml), s3 support and many utilities.
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npcpy
The python library for research and development in NLP, multimodal LLMs, Agents, ML, Knowledge Graphs, and more.
Project mention: We are building data breach machines and nobody cares | news.ycombinator.com | 2026-03-10 -
themes
Custom themes repository for Warp, a blazingly fast modern terminal built in Rust. (by warpdotdev)
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Project mention: ctxure alternatives - mashumaro, cattrs, pydantic, and msgspec | libhunt.com/r/ctxure | 2026-06-05
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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A note from our sponsor - SaaSHub
www.saashub.com | 13 Jun 2026
Index
What are some of the best open-source YAML projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Anthropic-Cybersecurity-Skills | 15,458 |
| 2 | jc | 8,624 |
| 3 | tmuxp | 4,520 |
| 4 | dynaconf | 4,306 |
| 5 | datamodel-code-generator | 3,923 |
| 6 | msgspec | 3,800 |
| 7 | yamllint | 3,402 |
| 8 | yq | 2,950 |
| 9 | pyyaml | 2,900 |
| 10 | omegaconf | 2,392 |
| 11 | kapitan | 1,914 |
| 12 | strictyaml | 1,616 |
| 13 | python-benedict | 1,606 |
| 14 | scanapi | 1,564 |
| 15 | homeassistant | 1,477 |
| 16 | npcpy | 1,385 |
| 17 | themes | 992 |
| 18 | mashumaro | 923 |
| 19 | pyserde | 850 |
| 20 | netplan | 845 |
| 21 | shyaml | 769 |
| 22 | Yamale | 765 |
| 23 | jinja2-cli | 603 |
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