Borrowing it
Nothing to install: this file belongs to ARCASSystems/FounderOS. 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/ARCASSystems/FounderOS/main/GEMINI.mdgit clone --depth 1 https://github.com/ARCASSystems/FounderOSWrote 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/arcassystems/founderos/gemini-md)<a href="https://agentmods.dev/instructions/arcassystems/founderos/gemini-md"><img src="https://agentmods.dev/badge/instructions/arcassystems/founderos/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/arcassystems/founderos/gemini-md"><img src="https://agentmods.dev/badge/instructions/arcassystems/founderos/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 | $0.01883 | $0.01883 |
| Opus 5.5 | $0.00753 | $0.00753 |
| Sonnet 5.5 | $0.00377 | $0.00377 |
| Haiku 4.5 | $0.00188 | $0.00188 |
Grade A, and why
FounderOS 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 today.
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 — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FounderOS - Gemini CLI Context
Context loader for Gemini CLI and other non-Claude agents operating in this repo.
This file is a thin bridge, not a separate rulebook. The canonical instruction file is CLAUDE.md - the full cross-agent reference (repo map, roles, slash commands, substrate, hooks, what-not-to-do) lives there. AGENTS.md is a peer bridge that carries the same cross-agent deltas for Codex-style agents. Read CLAUDE.md at session start.
Read first
CLAUDE.md- the source of truth for how this OS behaves, and the full cross-agent reference (repo map, roles, skills, commands, hooks, substrate).AGENTS.md- a peer bridge listing the same cross-agent deltas (slash commands not executable, skills as procedural reference, do not claim hooks ran).README.md- the product picture and setup path.
Do not duplicate or override those files here. If anything in this file ever disagrees with CLAUDE.md, CLAUDE.md wins.
Gemini-specific operating notes
- The slash commands in
.claude/commands/are Claude Code specific. You cannot run them. Treat them as documented procedures, not executable actions. - Run only what your environment actually supports, and say plainly what you can and cannot do. Slash commands and hooks are Claude Code only, so do not claim they fired. If you are pointed at the folder with write access you can run
reasoningandlocal-writesskills directly; if your environment cannot run a script, read the produced artifacts for alocal-execskill instead of running it. Never claim that setup, hooks, a file write, MCP authentication, or a scheduled routine happened when it did not. - Skills in
skills/<name>/SKILL.mdare readable as procedural reference. The trigger frontmatter is for Claude's auto-invocation; the protocol body is portable and you can follow it by hand. - Runtime honesty and the per-skill
Runs on:contract: every skill declares its runtime class (reasoning,local-writes, orlocal-exec) on aRuns on:line in itsSKILL.md. The full contract and the honest-degradation rule live inCLAUDE.md. Read it there. If you are pointed at the folder with write access you may run alocal-writesskill; if you cannot run a script you read the produced artifacts for alocal-execskill and say so. If anything here disagrees,CLAUDE.mdwins. - Do not invent the operator's identity, priorities, decisions, clients, or revenue. If the six context files named in
CLAUDE.mdare missing, the OS is not set up. - Setup, the one truth: the setup wizard, the slash commands, the hooks and the session brief run in Claude Code. Tell the user the supported way is to open the folder in Claude Code and say "set up Founder OS". If they want to go ahead in Gemini CLI instead, you can follow
skills/founder-os-setup/SKILL.mdand itsreferences/by hand, one question at a time, but without the hooks, the commands or the session brief. Say plainly that this path has not been tested before you start it. - When you give an opinion of consequence, follow the output bias self-check in
rules/biases.md: attach a counter-case, a confidence level, what evidence is absent, and the do-nothing option. There is no bias-free advice; name the most likely bias and argue the other side rather than claim none exists. - If you do recurring work in this OS (an SEO pass, outreach drafting, a content pipeline), you are a candidate digital employee. The team contract - charters in
roles/employees.yaml, propose-only vs draft-only, seats earned through recorded runs, nothing sent on the operator's behalf - is inAGENTS.mdunder "Joining the operator's team". It applies to you the same way.
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.
- today Changed · +17 lines · +1,024 tokens per session 3b39b154d7e9
- 1mo ago First seen · 42 lines · 859 tokens per session scan A 150a842f9a91
FounderOS GEMINI.md is an instructions file published in the GitHub repository ARCASSystems/FounderOS (6 stars, last pushed yesterday), licensed MIT. It adds 1,883 tokens to every session, about $0.0075 per session on Opus 5.5. 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.
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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.