Borrowing it
Nothing to install: this file belongs to yfge/agent-harness-skills. 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/yfge/agent-harness-skills/main/GEMINI.mdgit clone --depth 1 https://github.com/yfge/agent-harness-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/instructions/yfge/agent-harness-skills/gemini-md)<a href="https://agentmods.dev/instructions/yfge/agent-harness-skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/yfge/agent-harness-skills/gemini-md/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/instructions/yfge/agent-harness-skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/yfge/agent-harness-skills/gemini-md.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 | $0.00111 | $0.00111 |
| Opus 5 | $0.00056 | $0.00056 |
| Sonnet 5 | $0.00022 | $0.00022 |
| Haiku 4.5 | $0.00011 | $0.00011 |
Grade A, and why
agent-harness-skills GEMINI.md 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.
What it actually says
Agent Harness Skills For Gemini
This extension provides reusable skills for repository harness design.
Use INDEX.md to choose the right skill before answering repository harness questions. The skills live under skills/<skill-name>/SKILL.md: four core skills cover assessment and entrypoints, repository contracts and structural quality, validation surfaces, and runtime evidence; one optional governance skill covers work state and delivery policy.
Keep skill usage repo-neutral. Do not copy private environment assumptions, URLs, credentials, or project-specific workflow details into reusable guidance.
@./INDEX.md
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 · 10 lines · 111 tokens per session scan A 1142402c575a
agent-harness-skills GEMINI.md is an instructions file published in the GitHub repository yfge/agent-harness-skills (10 stars, last pushed 1mo ago), licensed MIT. It adds 111 tokens to every session, about $0.0006 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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