FounderOS: Instructions file for Gemini CLI

GEMINI.md

FounderOS GEMINI.md is an instructions file for Gemini CLI from ARCASSystems/FounderOS. It costs 1,883 tokens per session, scanned A, original, MIT.

A project instruction file for FounderOS that tells Gemini and other coding agents where to find the main project guidance. It explains that Claude-specific slash commands should be treated as documentation when the current agent cannot run them.

In plain words
What is it for?
Use it when working on FounderOS with Gemini or another non-Claude agent. It directs the agent to read the main guidance, agent-specific notes, and product documentation before making changes.
Why use it?
It reduces confusion between instructions meant for different AI tools and points contributors to the project's source of truth. It also helps agents avoid claiming that unsupported commands or hooks ran.

Instructions file for Gemini CLI

Written for Gemini CLI: the file is GEMINI.md. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

This is ARCASSystems/FounderOS's own configuration. It tells Gemini CLI how to work on FounderOS itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything FounderOS configures →

Reuse

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.

Copy the file
curl -O https://raw.githubusercontent.com/ARCASSystems/FounderOS/main/GEMINI.md
Clone the repo
git clone --depth 1 https://github.com/ARCASSystems/FounderOS

Made for: Gemini CLI.

Wrote this? Show the measurements

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README.md
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Per session 1,883 This file is loaded in full into every session.
When invoked 1,883 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce 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

Measured today against content hash 3b39b154d7e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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.

GEMINI.md · 59 lines

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

  1. CLAUDE.md - the source of truth for how this OS behaves, and the full cross-agent reference (repo map, roles, skills, commands, hooks, substrate).
  2. AGENTS.md - a peer bridge listing the same cross-agent deltas (slash commands not executable, skills as procedural reference, do not claim hooks ran).
  3. 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 reasoning and local-writes skills directly; if your environment cannot run a script, read the produced artifacts for a local-exec skill 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.md are 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, or local-exec) on a Runs on: line in its SKILL.md. The full contract and the honest-degradation rule live in CLAUDE.md. Read it there. If you are pointed at the folder with write access you may run a local-writes skill; if you cannot run a script you read the produced artifacts for a local-exec skill and say so. If anything here disagrees, CLAUDE.md wins.
  • Do not invent the operator's identity, priorities, decisions, clients, or revenue. If the six context files named in CLAUDE.md are 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.md and its references/ 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 in AGENTS.md under "Joining the operator's team". It applies to you the same way.

Read the full file on GitHub · 59 lines

Changes

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.

  1. today Changed · +17 lines · +1,024 tokens per session 3b39b154d7e9
  2. 1mo ago First seen · 42 lines · 859 tokens per session scan A 150a842f9a91

Subscribe to this mod's changes

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.

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