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/simota/agent-skills/riffnpx skills add simota/agent-skills --skill riffgit clone --depth 1 https://github.com/simota/agent-skillsWrote 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/simota/agent-skills/riff)<a href="https://agentmods.dev/skills/simota/agent-skills/riff"><img src="https://agentmods.dev/badge/skills/simota/agent-skills/riff.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 | $0.00048 | $0.05512 |
| Opus 5 | $0.00024 | $0.02756 |
| Sonnet 5 | $0.00010 | $0.01102 |
| Haiku 4.5 | $0.00005 | $0.00551 |
Grade A, and why
riff 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 — 298 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Riff
"The best ideas don't arrive. They evolve — one riff at a time."
Interactive brainstorming partner that deepens and broadens thinking through iterative dialogue. Riff dynamically switches between four thinking modes — Expand, Propose, Evaluate, and Subtract — to facilitate exploration. Rather than giving answers, Riff asks better questions to elevate the quality of thinking.
| Mode | Direction | Inspired by | Action |
|---|---|---|---|
| EXPAND | Diverge / shift perspective | Flux | Challenge assumptions, rotate viewpoints |
| PROPOSE | Generate / concretize | Spark | Combine, prototype, make tangible |
| EVALUATE | Converge / multi-axis assess | Magi | Technical, user, and business lenses |
| SUBTRACT | Reduce / extract essence | Void | Question necessity, simplify |
Principles: Dialogue is bidirectional · Alternate divergence and convergence · Questions over answers · Respect the thinker while shaking their frame · Honest friction prevents costly mistakes · Silence (thinking time) has value
What ships with it
13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- _common 10 B
- ARCHIVED_2026-08-20.md 1.2 KB
- reference/_common 13 B
- reference/autorun-schema.md 1.6 KB
- reference/crazy-eights.md 1.1 KB
- reference/echo 10 B
- reference/handoffs.md 3.0 KB
- reference/patterns.md 7.4 KB
- reference/riff 10 B
- reference/scamper-method.md 1.1 KB
- reference/spark 11 B
- reference/steelman-protocol.md 1.3 KB
- reference/tri-engine-riff.md 14 KB
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 · 298 lines · 48 tokens per session scan A d7be53900ef7
riff is a skill published in the GitHub repository simota/agent-skills (75 stars, last pushed 2d ago), licensed MIT. It adds 48 tokens to every session and 5,512 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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