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 utk2103/Prompt-Studio --skill lean-helpgit clone --depth 1 https://github.com/utk2103/Prompt-StudioWrote 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/utk2103/prompt-studio/lean-help)<a href="https://agentmods.dev/skills/utk2103/prompt-studio/lean-help"><img src="https://agentmods.dev/badge/skills/utk2103/prompt-studio/lean-help/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/utk2103/prompt-studio/lean-help"><img src="https://agentmods.dev/badge/skills/utk2103/prompt-studio/lean-help.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00074 | $0.01439 |
| Opus 5.5 | $0.00030 | $0.00576 |
| Sonnet 5.5 | $0.00015 | $0.00288 |
| Haiku 4.5 | $0.00007 | $0.00144 |
Grade B, and why
lean-help scanned grade B with 1 finding 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 1mo 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
| Check current | `cat ~/.claude/.lean-active` | How it starts
The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lean Help
Display this reference card when invoked. One-shot only — do NOT change
mode, write flag files, touch ~/.claude/.lean-active, or persist state of
any kind. If the user wants to switch modes, point them at the trigger.
Levels at a glance
| Level | Trigger | Rule of thumb | Diff shape |
|---|---|---|---|
| Lite | /prompt-studio:lean lite |
Build what's asked. Name the lazier alternative in one line. | Requested code + 1-line footnote. |
| Full | /prompt-studio:lean (default) |
The ladder: YAGNI → reuse → stdlib → native → installed dep → one line → minimum. | Shortest working diff. ≤3 lines of prose. |
| Ultra | /prompt-studio:lean ultra |
YAGNI extremist. Deletion beats addition. Challenges the requirement before building. | Often zero code + a question back. |
Level sticks until you change it or the session ends. Persisted in
~/.claude/.lean-active so it survives across turns.
Same task, three levels
Task: "Add a cache for these API responses."
| Level | Response |
|---|---|
| Lite | Custom TTLCache class as asked. Note: functools.lru_cache(maxsize=1000) covers it in one line. |
| Full | @lru_cache(maxsize=1000) on the fetch function. Skipped custom cache, add when lru_cache measurably falls short. |
| Ultra | Do these responses actually re-fetch? Show me a hot path. If yes: @lru_cache. If not: skip. |
Skills
| Skill | Trigger | What it does |
|---|---|---|
| lean | /prompt-studio:lean [lite|full|ultra] |
Lazy mode itself. Shortest solution that actually works. |
| compress | /prompt-studio:compress FILE |
Compress a memory file (CLAUDE.md, todos, prefs) into Lean shorthand. Backup at FILE.original.md. |
| lean-audit | /prompt-studio:lean-audit |
Whole-repo over-engineering audit. Ranked list of what to delete/simplify across the codebase. |
| lean-commit | /prompt-studio:lean-commit |
Generate a terse Conventional Commits message for staged changes. Message only — never runs git. |
| lean-debt | /prompt-studio:lean-debt |
Harvest lean: comments into a debt ledger so deferrals get tracked, not forgotten. |
| lean-gain | /prompt-studio:lean-gain |
Measured impact scoreboard — less code, more speed (no cost claim). |
| lean-review | /prompt-studio:lean-review |
Review a diff for over-engineering only. One line per finding: what to cut, what replaces it. |
| lean-help | /prompt-studio:lean-help |
This card. |
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.
- 1mo ago First seen · 142 lines · 74 tokens per session scan B 94ab958c79f9
lean-help is a skill published in the GitHub repository utk2103/Prompt-Studio (9 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 74 tokens to every session and 1,439 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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