Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/jpm1118/threadwork/writing-skillsnpx skills add JPM1118/Threadwork --skill writing-skillsgit clone --depth 1 https://github.com/JPM1118/ThreadworkWrote 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.
[](https://agentmods.dev/skills/jpm1118/threadwork/writing-skills)<a href="https://agentmods.dev/skills/jpm1118/threadwork/writing-skills"><img src="https://agentmods.dev/badge/skills/jpm1118/threadwork/writing-skills.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00043 | $0.01235 |
| Opus 5 | $0.00022 | $0.00617 |
| Sonnet 5 | $0.00009 | $0.00247 |
| Haiku 4.5 | $0.00004 | $0.00123 |
Grade A, and why
writing-skills scanned grade A with 0 findings 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 5d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing Skills
Overview
Writing skills IS Test-Driven Development applied to process documentation.
You write test cases (pressure scenarios with subagents), watch them fail (baseline behavior), write the skill (documentation), watch tests pass (agents comply), and refactor (close loopholes).
Core principle: If you didn't watch an agent fail without the skill, you don't know if the skill teaches the right thing.
What is a Skill?
A skill is a reference guide for proven techniques, patterns, or tools. Skills help future Claude instances find and apply effective approaches.
Skills are: Reusable techniques, patterns, tools, reference guides
Skills are NOT: Narratives about how you solved a problem once
When to Create a Skill
Create when:
- Technique wasn't intuitively obvious to you
- You'd reference this again across projects
- Pattern applies broadly (not project-specific)
- Others would benefit
Don't create for:
- One-off solutions
- Standard practices well-documented elsewhere
- Project-specific conventions (put in CLAUDE.md)
Skill Types
| Type | Description | Examples |
|---|---|---|
| Technique | Concrete method with steps | condition-based-waiting, root-cause-tracing |
| Pattern | Way of thinking about problems | flatten-with-flags, test-invariants |
| Reference | API docs, syntax guides | office docs, tool references |
Directory Structure
skills/
skill-name/
SKILL.md # Main reference (required)
supporting-file.* # Only if needed
SKILL.md Structure
Frontmatter (YAML):
- Only two fields:
nameanddescription - Max 1024 characters total
name: Use letters, numbers, and hyphens onlydescription: Third-person, includes WHAT and WHEN to use
---
name: skill-name-with-hyphens
description: Use when [triggers] - [what it does]
---
# Skill Name
## Overview
What is this? Core principle in 1-2 sentences.
## When to Use
Bullet list with SYMPTOMS and use cases
When NOT to use
## Core Pattern
Before/after code comparison
## Quick Reference
Table or bullets for scanning
## Common Mistakes
What goes wrong + fixes
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.
- 5d ago First seen · 196 lines · 43 tokens per session scan A ae58d0a00e68
writing-skills is a skill published in the GitHub repository JPM1118/Threadwork (5 stars, last pushed 9mo ago), licensed MIT. It adds 43 tokens to every session and 1,235 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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