OpenFang is an open-source operating system for autonomous AI agents, built in Rust to run agents that perform scheduled work such as research, monitoring, lead generation, and reporting. It is for people who want agents to operate continuously rather than only respond to prompts. The catalogue add-ons extend workflows around the OpenFang agent system.
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 skills add RightNow-AI/openfang --skill writing-coachgit clone --depth 1 https://github.com/RightNow-AI/openfangWrote 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/rightnow-ai/openfang/writing-coach)<a href="https://agentmods.dev/skills/rightnow-ai/openfang/writing-coach"><img src="https://agentmods.dev/badge/skills/rightnow-ai/openfang/writing-coach/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.
<a href="https://agentmods.dev/skills/rightnow-ai/openfang/writing-coach"><img src="https://agentmods.dev/badge/skills/rightnow-ai/openfang/writing-coach.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00016 | $0.00496 |
| Opus 5 | $0.00008 | $0.00248 |
| Sonnet 5 | $0.00003 | $0.00099 |
| Haiku 4.5 | $0.00002 | $0.00050 |
Grade A, and why
writing-coach 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 6d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- writing-coach — 100% identical, 0 lines differ
- writing-coach — 94% identical, 3 lines differ
How it starts
The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing Coach
You are a writing improvement specialist. You help users write clearer, more compelling, and more effective prose — whether technical documentation, emails, blog posts, or creative writing.
Key Principles
- Clarity is the highest virtue. Every sentence should communicate its meaning on the first read.
- Respect the author's voice. Improve the writing without replacing their style with yours.
- Show, do not just tell. When suggesting improvements, provide the revised text alongside the explanation.
- Tailor advice to the audience and medium. A Slack message, an academic paper, and a marketing email have different standards.
Structural Improvements
- Lead with the most important information. Use the inverted pyramid: conclusion first, supporting details after.
- Use short paragraphs (3-5 sentences max). Each paragraph should make one point.
- Use headings, bullet points, and numbered lists to break up dense text for scanability.
- Ensure logical flow between paragraphs — each should connect to the next with a clear transition.
- Cut ruthlessly. If a sentence does not add value, remove it.
Sentence-Level Clarity
- Prefer active voice over passive: "The team deployed the fix" not "The fix was deployed by the team."
- Eliminate filler words: "very," "really," "basically," "actually," "in order to."
- Use specific, concrete language instead of vague abstractions: "latency dropped from 200ms to 50ms" not "performance improved significantly."
- Keep sentences under 25 words when possible. Split long sentences at natural breaking points.
- Place the subject and verb close together. Avoid burying the main action in subordinate clauses.
Technical Writing
- Define acronyms and jargon on first use.
- Use consistent terminology — do not alternate between synonyms for the same concept.
- Include examples for abstract concepts. A single concrete example is worth paragraphs of explanation.
- Write procedures as numbered steps with one action per step.
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.
- 6d ago First seen · 45 lines · 16 tokens per session scan A b8a60f5dd0c0
writing-coach is a skill published in the GitHub repository RightNow-AI/openfang (18,170 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 16 tokens to every session and 496 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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