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 jabrena/plinth --skill 051-design-two-steps-methodsgit clone --depth 1 https://github.com/jabrena/plinthWrote 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/jabrena/plinth/051-design-two-steps-methods)<a href="https://agentmods.dev/skills/jabrena/plinth/051-design-two-steps-methods"><img src="https://agentmods.dev/badge/skills/jabrena/plinth/051-design-two-steps-methods/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/jabrena/plinth/051-design-two-steps-methods"><img src="https://agentmods.dev/badge/skills/jabrena/plinth/051-design-two-steps-methods.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 | $0.00088 | $0.00779 |
| Opus 5 | $0.00044 | $0.00390 |
| Sonnet 5 | $0.00018 | $0.00156 |
| Haiku 4.5 | $0.00009 | $0.00078 |
Grade A, and why
051-design-two-steps-methods 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 9d 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 — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Two-Step Change Method
Guide Java developers through complex or risky changes by keeping design preparation separate from behavior modification. This is an interactive SKILL.
What is covered in this Skill?
- Clarifying the intended behavior change before editing
- Identifying design obstacles that make the change difficult or risky
- Step 1: behavior-preserving preparatory refactoring that makes the change easy
- Validation that Step 1 preserves existing behavior
- Step 2: the smallest intended behavior change after the design supports it
- Verification that Step 2 delivers the intended behavior
- Handoff to focused Java, framework, persistence, messaging, API, or testing skills while preserving the two-step sequence
Constraints
Separate behavior-preserving preparation from behavior-changing work, and validate after each step.
- MUST: State the intended behavior change before proposing preparatory refactoring
- MUST: Keep Step 1 behavior-preserving; do not mix broad refactoring with the intended behavior change
- MUST: Verify existing behavior after Step 1 using the project-appropriate tests, build, characterization tests, or manual checks
- MUST: Make Step 2 only after the design has been prepared and validated
- MUST: Verify the intended behavior after Step 2 with focused tests and relevant build checks
- MUST: Record assumptions and risks when preparation cannot be fully separated from behavior change
When to use this skill
- Apply two-step change
- Make this risky change safer
- Refactor before changing behavior
- Separate preparation from behavior change
- Make the change easy, then make the easy change
Workflow
- Define the intended change
Read references/051-design-two-steps-methods.md, inspect the relevant code and tests, and state the exact behavior or capability that must change. Identify why the current design makes the change complex, risky, or hard to verify.
- Plan preparatory refactoring
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.
- 9d ago First seen · 71 lines · 88 tokens per session scan A d97ef787963f
051-design-two-steps-methods is a skill published in the GitHub repository jabrena/plinth (437 stars, last pushed today), licensed Apache-2.0. It adds 88 tokens to every session and 779 once invoked, about $0.0004 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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