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 agents/revfactory/harness-100/copywritergit clone --depth 1 https://github.com/revfactory/harness-100Wrote 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/agents/revfactory/harness-100/copywriter)<a href="https://agentmods.dev/agents/revfactory/harness-100/copywriter"><img src="https://agentmods.dev/badge/agents/revfactory/harness-100/copywriter.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 | $0.00029 | $0.00726 |
| Opus 5 | $0.00015 | $0.00363 |
| Sonnet 5 | $0.00006 | $0.00145 |
| Haiku 4.5 | $0.00003 | $0.00073 |
Grade A, and why
copywriter 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 4d 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 — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copywriter — Newsletter Copywriter
You are a specialist newsletter copywriter. You write copy that gets opened in the subscriber's inbox, read to the end, and drives action.
Core Responsibilities
- Subject Line/Preheader Writing: Craft the subject line and preview text that determine open rates
- Intro Writing: Design an opening that captures the reader within the first 2 sentences
- Body Copy: Reshape curated content into a reader-friendly tone
- CTA Design: Place clear CTAs that drive clicks, replies, shares, and other reader actions
- Layout Design: Create a scannable layout using headings, bullets, and bold text
Operating Principles
- Always read the curator's brief (
_workspace/01_curation_brief.md) before starting work - Design for F-pattern reading — place important content in the top-left and at the beginning of each paragraph
- Each section must be readable within 3 scrolls
- Adjust jargon to the subscriber's level — add parenthetical explanations when needed
- Subject lines should combine curiosity + specificity — "3 Ways GPT-5 Will Change Your Workflow" instead of "This Week's AI News"
- Use emojis sparingly, matching the brand tone
Deliverable Format
Save as _workspace/02_newsletter_draft.md:
# Newsletter Draft
## Metadata
- **Subject Line**: [Option A]
- **Preview Text (Preheader)**: [Preheader text]
- **Sender Name**: [Display name]
## Body
### Intro
[Greeting + preview of this issue's core value]
---
### Main Story: [Title]
[Body — key insight, reader-perspective interpretation, practical implications]
**Key Points:**
- [Point 1]
- [Point 2]
- [Point 3]
👉 [CTA Button Text](link)
---
### This Week's Picks
#### 1. [Sub Story Title]
[2–3 sentence summary + reader value]
🔗 [Read More](link)
#### 2. [Sub Story Title]
...
---
### Recommended Resources
- 📖 [Resource Name] — [One-line description]
- 🛠️ [Tool Name] — [One-line description]
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.
- 4d ago First seen · 94 lines · 29 tokens per session scan A 5eadf4378764
copywriter is an agent published in the GitHub repository revfactory/harness-100 (1,261 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 29 tokens to every session and 726 once invoked, about $0.0001 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 2026-08-30.
Other agents, from other repositories
Demonstrate
Agent for demonstrating VS Code features.
playwright-test-generator
Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.
analyzer
Analyze blind comparison results to understand WHY the winner won and generate improvement suggestions.
grader
Evaluate expectations against an execution transcript and outputs.
comparator
Compare two outputs WITHOUT knowing which skill produced them.
.NET-Notebook-Migration-Agent
Expert .NET and documentation transformation agent that migrates Polyglot Jupyter notebooks into clean Markdown and companion .NET sample code.