AI tools for writing code: rules, skills and config
Tools that give coding agents shared rules, skills and settings, so Claude Code, Cursor, Codex and others follow the same conventions in every repo. Of the 282 tools on our writing code page, 12 fit this narrower job. By pricing: 10 open source, 2 free or freemium. The most-starred open repos here are CC Switch (145,685 stars), HyperFrames (66,201 stars), LibreChat (45,910 stars). Most come from the coding (3), research (2), vision (2) categories.
CC Switch
Desktop manager for Claude Code, Codex, Gemini CLI, OpenCode, OpenClaw and other coding agents that switches API providers in one click and manages MCP servers, skills and prompts.
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HyperFrames
HeyGen's open-source framework that renders HTML, CSS and animations into deterministic MP4 videos, usable from a CLI or by coding agents through skills.
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LibreChat
Self-hosted, multi-user AI chat platform with agents, MCP, skills, code interpreter and support for OpenAI, Anthropic, Gemini, AWS, Azure and many more providers.
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Gentle AI
Configures the coding agents you already use with shared rules, skills and settings.
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Voyager
Research agent that explores Minecraft on its own, writing and reusing code skills to learn as it goes.
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Agents CLI
Google's CLI and skills that teach coding assistants to build, evaluate and deploy agents on Google Cloud and the Gemini platform.
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Observal
Self-hosted registry and insight engine for sharing coding-agent skills, MCP servers and agents across a team.
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OpenScience
Research agent workbench that reads the literature, writes and runs code and experiments and logs every step, with skills and connectors for databases like PubMed, UniProt and arXiv.
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Paper2Agent
Multi-agent system that turns a research paper and its code into a working MCP server and agent skills you can query and run.
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Ruler
Applies one set of rules to all your coding agents.
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Telekinesis Agentic Skill Library
Python library of 250+ perception, vision and robotics skills plus a Physical AI agent that turns natural-language prompts into reviewable robot code.
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Ultralytics Agents
Visual canvas in Ultralytics Platform that chains YOLO models, vision-language models, conditions and actions like Slack alerts, plus official agent skills that let coding agents train, tune and export YOLO models.
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GitHub repos (12)
| Repo | GitHub stars | Licence | Last push |
|---|---|---|---|
| CC Switch ↗ | 145,685 | — | — |
| HyperFrames ↗ | 66,201 | — | — |
| LibreChat ↗ | 45,910 | — | — |
| Gentle AI ↗ | 7,813 | MIT | 2026-10-15 |
| Voyager ↗ | 7,268 | MIT | 2023-07-27 |
| Agents CLI ↗ | 6,099 | — | — |
| Observal ↗ | 4,517 | — | — |
| OpenScience ↗ | 4,043 | Apache License 2.0 | 2026-10-18 |
| Paper2Agent ↗ | 3,830 | MIT | 2026-09-17 |
| Ruler ↗ | 2,946 | MIT | 2026-08-19 |
| Telekinesis Agentic Skill Library ↗ | 86 | Apache License 2.0 | 2026-10-05 |
| Ultralytics Agents ↗ | 30 | GNU AGPL v3.0 | 2026-10-10 |
12 repos. Stars and licence come from each repo, checked when the listing was last verified.
FAQ
What are the best AI tools for writing code focused on rules, skills and config?
We list 12. The first three by GitHub stars and featured status are CC Switch: Desktop manager for Claude Code, Codex, Gemini CLI, OpenCode, OpenClaw and other coding agents that switches API providers in one click and manages MCP servers, skills and prompts.; HyperFrames: HeyGen's open-source framework that renders HTML, CSS and animations into deterministic MP4 videos, usable from a CLI or by coding agents through skills.; LibreChat: Self-hosted, multi-user AI chat platform with agents, MCP, skills, code interpreter and support for OpenAI, Anthropic, Gemini, AWS, Azure and many more providers.
Are there free or open-source options?
Yes: 10 open source, 2 free or freemium. Pricing is as each maker states it.
More from writing code
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