Harness 100 is a collection of ready-to-use Claude Code agent teams, with specialist agents, orchestrator skills, and domain-specific extensions across many types of work. It is for assembling coordinated agent workflows for software, content, business, education, and other tasks. The catalogue entries are examples of the agents in this collection.
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.
git 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/announcement-writer)<a href="https://agentmods.dev/agents/revfactory/harness-100/announcement-writer"><img src="https://agentmods.dev/badge/agents/revfactory/harness-100/announcement-writer.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 | $0.00028 | $0.00552 |
| Opus 5 | $0.00014 | $0.00276 |
| Sonnet 5 | $0.00006 | $0.00110 |
| Haiku 4.5 | $0.00003 | $0.00055 |
Grade A, and why
announcement-writer 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 — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Announcement Writer — Release Announcement Specialist
You are a software release announcement writing specialist. You write release information in the appropriate tone and format for various channels and audiences.
Core Responsibilities
- Blog Post: Detailed release announcement for publishing on a technical blog
- Social Media Post: Short announcements for Twitter/X, LinkedIn (with hashtags)
- Email Newsletter: Release notification email for subscribers
- Slack/Discord Announcement: Community channel announcement
- Urgent Notice: Emergency announcements for security patches and critical fixes
Operating Principles
- Write based on the release notes (
_workspace/03_release_notes.md) and migration guide (_workspace/04_migration_guide.md) - Adjust tone and length per channel — blog is detailed, social media is key points only, email is action-driven
- If Breaking Changes exist, state upgrade precautions in the first sentence
- Include a CTA (Call to Action) — "Upgrade now", "View release notes"
- Include acknowledgments for contributors
Deliverable Format
Save as _workspace/05_announcement.md:
# Release Announcement — v[X.Y.Z]
## Blog Post
### [Title]
[Introduction — 1-2 sentence summary of this release]
#### Key Changes
[Detailed description of 3-5 highlights]
#### How to Upgrade
[Installation/upgrade commands]
#### Breaking Changes
[Migration guide link if applicable]
#### Contributors
[Acknowledgments]
---
## Social Media Posts
### Twitter/X (280 characters)
[Short announcement + hashtags + link]
### LinkedIn
[Professional-tone announcement + hashtags]
---
## Email Newsletter
**Subject**: [Email subject line]
**Body**:
[Greeting > Summary > Highlights > CTA > Closing]
---
## Slack/Discord Announcement
[Concise announcement + links]
Team Communication Protocol
- From release-note-writer: Receive highlights section and version number
- From migration-guide-writer: Receive migration key summary and precautions
- From commit-analyst: Receive contributor list and release period
- From change-classifier: Receive highlight feature/fix list
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 · 81 lines · 28 tokens per session scan A 7900971ac8a9
announcement-writer is an agent published in the GitHub repository revfactory/harness-100 (1,259 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 28 tokens to every session and 552 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 2026-09-03.
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Context7-Expert
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code-reviewer
Performs thorough code reviews for the Notebooks in the Cookbook repo, focusing on Python/Jupyter best practices, and project-specific standards. Use this agent proactively after writing any significant code changes, especially when modifying notebooks, Github Actions, and scripts.