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 reidemeister94/development-skills --skill using-development-skillsgit clone --depth 1 https://github.com/reidemeister94/development-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/reidemeister94/development-skills/using-development-skills)<a href="https://agentmods.dev/skills/reidemeister94/development-skills/using-development-skills"><img src="https://agentmods.dev/badge/skills/reidemeister94/development-skills/using-development-skills.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 | $0.00730 |
| Opus 5 | $0.00014 | $0.00365 |
| Sonnet 5 | $0.00005 | $0.00146 |
| Haiku 4.5 | $0.00003 | $0.00073 |
Grade A, and why
using-development-skills 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
Using development-skills
Skip this router for a bounded subagent task. Read the development loop. Resume an active plan at its recorded step; otherwise choose:
Direct applies only when the result, forced solution, and proof are clear. The change must be reversible and carry no business or design choice. Weighing more than one viable approach is a design choice.
Full applies to everything else. Inspect first, run brainstorming, and agree on the result and proof.
Use create-test for test work or business, integration, KPI, and probabilistic proof. Use best-practices when current external evidence can change a decision.
Then write the plan and chronicle.
In chat, cover result, checks, what is out of scope, approach, files, and risks. Offer the conversation-language equivalents of Approve / Edit / Cancel / Chat about, then stop. Only Approve after that presentation permits implementation; the original request does not.
After approval, implement, verify, explain concepts worth transferring, and review.
Create or update the repository plan and chronicle in completed tool calls before product or plugin edits. Never combine them in one patch. Record Current step: Implement, then complete Implement, Verify, Explain diff, and Review.
After Verify and before Review:
- a business, architectural, lifecycle, trade-off, or failure-mode concept exists → enter Explain diff;
- no concept is worth transferring → state that briefly and continue.
This gate does not affect Direct.
Translate older Claude Code tool names on Codex with codex-tools.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 · 58 lines · 27 tokens per session scan A c4eb19ecf674
using-development-skills is a skill published in the GitHub repository reidemeister94/development-skills (11 stars, last pushed 1mo ago), licensed MIT. It adds 27 tokens to every session and 730 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 2026-08-30.
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