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Trellis: Skill for Claude Code

.agents/skills/python-design/SKILL.md

python-design is a skill for Claude Code, Codex from mindfold-ai/Trellis. It costs 73 tokens per session (3,549 once invoked), scanned A, original, AGPL-3.0.

A guide to designing Python command-line scripts and small utilities. It focuses on using types, keeping modules focused, managing complexity, and spotting design problems.

In plain words
What is it for?
Use it when writing, reading, reviewing, or refactoring Python files, especially command-line scripts and files in .trellis/scripts/.
Why use it?
It helps make Python scripts easier to understand, review, and change without unnecessary complexity.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is mindfold-ai/Trellis's own configuration. It tells Claude Code and Codex how to work on Trellis itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything Trellis configures →

not rated 15krepo +29 1mo ago A scan SkillSpector: pass 73 tokens AGPL-3.0
View source ↗ mindfold-ai/Trellis docs.trytrellis.app
About the project

Trellis is an engineering framework that stores project specifications, tasks, and working memory in a repository so coding agents can follow consistent development practices across sessions. Teams use it to organize AI-assisted planning, implementation, review, and validation across multiple coding platforms. The catalogue entries provide Trellis commands, agents, hooks, skills, instructions, and settings.

mindfold-ai/Trellis · 15,098 stars · on GitHub · docs.trytrellis.app

Reuse

Borrowing it

Nothing to install: this file belongs to mindfold-ai/Trellis. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/mindfold-ai/Trellis/main/.agents/skills/python-design/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/mindfold-ai/Trellis

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for python-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/mindfold-ai/trellis/python-design/github.svg)](https://agentmods.dev/skills/mindfold-ai/trellis/python-design)
Your own site
<a href="https://agentmods.dev/skills/mindfold-ai/trellis/python-design"><img src="https://agentmods.dev/badge/skills/mindfold-ai/trellis/python-design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for python-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/mindfold-ai/trellis/python-design"><img src="https://agentmods.dev/badge/skills/mindfold-ai/trellis/python-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,549 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00073 $0.03549
Opus 5.5 $0.00029 $0.01420
Sonnet 5.5 $0.00015 $0.00710
Haiku 4.5 $0.00007 $0.00355

Measured 2mo ago against content hash 6520ddaf474e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

python-design scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

def run_git(args: list[str]) -> subprocess.CompletedProcess:
.agents/skills/python-design/SKILL.md · 452 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 452 lines · 73 tokens per session scan A 6520ddaf474e

Subscribe to this mod's changes

python-design is a skill published in the GitHub repository mindfold-ai/Trellis (15,098 stars, last pushed 1mo ago), licensed AGPL-3.0. It adds 73 tokens to every session and 3,549 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

LanguagesPythonagentic-codingai-workflowclaudecodecodexharness
Related

python-design compared with skills from other repositories

python-design next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
python-designmindfold-ai/TrellisSkill15k1mo agoAGPL-3.0A73Claude Code, Codex
astropyK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA56Claude Code, Codex
daskK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA67Claude Code
matlabK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA44Claude Code
optimize-for-gpuK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA151Claude Code, Codex
polarsK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA47Claude Code
bioservicesK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA56Claude Code