Borrowing it
Nothing to install: this file belongs to yelmuratoff/agent_sync. 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/yelmuratoff/agent_sync/main/.ai/src/skills/prompt-engineering/SKILL.mdgit clone --depth 1 https://github.com/yelmuratoff/agent_syncWrote 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/yelmuratoff/agent_sync/prompt-engineering)<a href="https://agentmods.dev/skills/yelmuratoff/agent_sync/prompt-engineering"><img src="https://agentmods.dev/badge/skills/yelmuratoff/agent_sync/prompt-engineering/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/yelmuratoff/agent_sync/prompt-engineering"><img src="https://agentmods.dev/badge/skills/yelmuratoff/agent_sync/prompt-engineering.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 | $0.00171 | $0.04030 |
| Opus 5.5 | $0.00068 | $0.01612 |
| Sonnet 5.5 | $0.00034 | $0.00806 |
| Haiku 4.5 | $0.00017 | $0.00403 |
Grade B, and why
prompt-engineering 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.
Asks the agent to reveal its instructionsmediumSystem prompt leakage
Directions to print, repeat or translate the system prompt extract configuration the operator did not intend to expose.
- **Golden rule**: show your prompt to a colleague with no context. If they'd be confused, the model will be too. The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What ships with it
3 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.
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 Changed · +5 lines 7abbefd2748a
- 2mo ago First seen · 118 lines · 171 tokens per session scan B 58d6a6de399b
prompt-engineering is a skill published in the GitHub repository yelmuratoff/agent_sync (18 stars, last pushed 1mo ago), licensed GPL-3.0. It adds 171 tokens to every session and 4,030 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks the agent to reveal its instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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