Borrowing it
Nothing to install: this file belongs to BilLogic/design-harnessing-kit. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/BilLogic/design-harnessing-kit/main/.agent/skills/compounder/SKILL.mdgit clone --depth 1 https://github.com/BilLogic/design-harnessing-kitWrote 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/billogic/design-harnessing-kit/compounder)<a href="https://agentmods.dev/skills/billogic/design-harnessing-kit/compounder"><img src="https://agentmods.dev/badge/skills/billogic/design-harnessing-kit/compounder.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 | $0.00027 | $0.00212 |
| Opus 5 | $0.00014 | $0.00106 |
| Sonnet 5 | $0.00005 | $0.00042 |
| Haiku 4.5 | $0.00003 | $0.00021 |
Grade A, and why
compounder 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 8d 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.
What it actually says
Compounder Skill
When to Activate
- After a design task is completed
- When a mistake or issue is discovered
- User says "remember this", "learn from this", "save this"
Behavior
- Identify what to compound — lesson, preference, ideation, or skill update?
- Structure entry using
references/compounding-guide.mdtemplates - Write to correct file:
- Mistake/solution →
knowledge/lessons-learned.md - Preference/decision →
knowledge/preferences.md - Idea/exploration →
knowledge/ideations.md - Skill change → update the relevant SKILL.md or references
- Mistake/solution →
- Log change in
knowledge/changelog.md - Confirm what was captured and where
References (load on demand)
references/compounding-guide.md
What ships with it
1 file 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.
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.
- 8d ago First seen · 26 lines · 27 tokens per session scan A 2511bb44295f
compounder is a skill published in the GitHub repository BilLogic/design-harnessing-kit (2 stars, last pushed 5mo ago), licensed MIT. It adds 27 tokens to every session and 212 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 2026-08-31.
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