Borrowing it
Nothing to install: this file belongs to jeffreytse/grimoire-core. 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/jeffreytse/grimoire-core/main/GEMINI.mdgit clone --depth 1 https://github.com/jeffreytse/grimoire-coreWrote 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/jeffreytse/grimoire-core/gemini-md)<a href="https://agentmods.dev/instructions/jeffreytse/grimoire-core/gemini-md"><img src="https://agentmods.dev/badge/instructions/jeffreytse/grimoire-core/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/jeffreytse/grimoire-core/gemini-md"><img src="https://agentmods.dev/badge/instructions/jeffreytse/grimoire-core/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 | $0.00805 | $0.00805 |
| Opus 5.5 | $0.00322 | $0.00322 |
| Sonnet 5.5 | $0.00161 | $0.00161 |
| Haiku 4.5 | $0.00081 | $0.00081 |
Grade A, and why
grimoire-core 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 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.
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.
This is a copy
100% identical to grimoire-core AGENTS.md — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
grimoire
Multi-domain skill collection for AI assistants. Skills work across Claude Code, Codex, Copilot, Gemini CLI, OpenCode, and more.
Skill Path Convention
All skill paths follow this pattern:
<domain>/<subdomain>/skills/<skill-name>/SKILL.md
If a task matches a skill, invoke it. Never implement directly when a skill applies.
Domains
| Domain | Sub-domains |
|---|---|
meta |
(flat — no sub-domains) |
engineering |
development, frontend, architecture, testing, reliability, devops, cloud, networking, security, data, ai, hardware, mobile, performance, project-management, product, documentation |
business |
strategy, operations, leadership, entrepreneurship, hr |
science |
biology, physics, chemistry, mathematics, earth-science, astronomy |
health |
fitness, nutrition, mental-health, sleep, medicine |
writing |
creative, technical, copywriting, academic, journalism |
design |
ui-ux, graphic, branding, motion, product |
marketing |
seo, content, social-media, paid-ads, growth, analytics |
finance |
personal-finance, investing, accounting, real-estate, corporate |
law |
contracts, ip, employment, privacy, corporate |
film |
cinematography, directing, editing, screenwriting, production |
music |
composition, production, mixing, theory, performance |
art |
drawing, painting, digital-art, illustration, color-theory |
sports |
training, coaching, nutrition, tactics, recovery |
psychology |
cognitive, behavioral, social, clinical, positive |
language |
learning, linguistics, translation, communication |
education |
curriculum, teaching, e-learning, assessment, learning-science |
cooking |
techniques, baking, flavor, nutrition, world-cuisine |
travel |
planning, budgeting, cultural, adventure |
home |
renovation, interior-design, gardening, organization, smart-home |
parenting |
infant, toddler, school-age, teen |
automotive |
maintenance, troubleshooting, buying, modifications, ev |
pets |
dogs, cats, training, nutrition, health |
fashion |
styling, wardrobe, design, sustainability, accessories |
environment |
sustainability, ecology, climate, energy, policy |
photography |
composition, lighting, editing, genres |
productivity |
time-management, habits, focus, goals, tools |
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 · 99 lines · 805 tokens per session scan A 6972c3bf3514
grimoire-core GEMINI.md is an instructions file published in the GitHub repository jeffreytse/grimoire-core (5 stars, last pushed 5d ago), licensed MIT. It adds 805 tokens to every session, about $0.0032 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to grimoire-core AGENTS.md, differing in 1 line, and is treated as a copy.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.