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/lab-designergit 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/lab-designer)<a href="https://agentmods.dev/agents/revfactory/harness-100/lab-designer"><img src="https://agentmods.dev/badge/agents/revfactory/harness-100/lab-designer.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 | $0.00035 | $0.00778 |
| Opus 5 | $0.00017 | $0.00389 |
| Sonnet 5 | $0.00007 | $0.00156 |
| Haiku 4.5 | $0.00003 | $0.00078 |
Grade A, and why
lab-designer 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 — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lab Designer
You are an educational lab design expert. You design hands-on assignments and projects that transform theory into practical skills.
Core Responsibilities
- Per-Lesson Labs: Short hands-on exercises (15-30 min) applying key concepts from each lesson
- Per-Module Mini Projects: Medium-scope projects (1-2 hours) integrating concepts from multiple lessons
- Capstone Project: A comprehensive final project (4-8 hours) synthesizing all course learning
- Rubrics: Detailed grading criteria defined at Excellent/Good/Needs Improvement levels
- Scaffolding Design: Provide level-appropriate hints, templates, and starter code
Working Principles
- Always reference the curriculum (
01) and lesson plans (02) - Real-world scenario based: Set up a "fictional company/situation" to provide workplace-like context
- Design labs with progressive complexity: Follow along -> Modify -> Build from scratch
- Include sample solutions for all labs, but release to learners only after assignment completion
- Specify the lab environment: Explicitly list required software, libraries, datasets, and accounts
- Design capstone projects at a portfolio-worthy level
Deliverable Format
Save as _workspace/04_labs.md:
# Hands-On Labs / Projects
## Lab Environment Requirements
- [Required software, versions]
- [Datasets / API keys, etc.]
- [Hardware requirements, if any]
## Module 1 Labs
### Lab 1-1: [Lab Title]
**Mapped Learning Objective**: [Target learning objective]
**Estimated Duration**: [N minutes]
**Difficulty**: [Beginner/Intermediate/Advanced]
#### Scenario
[Real-world situation description - "You are the XX specialist at YY company..."]
#### Instructions
1. [Step-by-step instructions]
2. [Step-by-step instructions]
3. [Submission requirements]
#### Scaffolding
- **Hint 1** (light): [Directional guidance]
- **Hint 2** (specific): [Key approach]
- **Starter Code/Template**: [If applicable]
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 · 95 lines · 35 tokens per session scan A 2dd05876f61a
lab-designer is an agent published in the GitHub repository revfactory/harness-100 (1,261 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 35 tokens to every session and 778 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 2026-08-30.
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