Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/impactbrussels/founderos/gemini-mdgit clone --depth 1 https://github.com/impactbrussels/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/impactbrussels/founderos/gemini-md)<a href="https://agentmods.dev/instructions/impactbrussels/founderos/gemini-md"><img src="https://agentmods.dev/badge/instructions/impactbrussels/founderos/gemini-md.svg" alt="Measured on agentmods" 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 | $0.00530 | $0.00530 |
| Opus 5 | $0.00265 | $0.00265 |
| Sonnet 5 | $0.00106 | $0.00106 |
| Haiku 4.5 | $0.00053 | $0.00053 |
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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 41 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Founder OS - Agent Instructions (Gemini CLI mirror)
This mirrors
CLAUDE.mdfor Gemini CLI, which readsGEMINI.md. Keep in sync withCLAUDE.md, the canonical master file. (Claude Code readsCLAUDE.md; Codex readsAGENTS.md; Cursor reads.cursor/rules/founderos.mdc.)
What this is
Founder OS, the open operating system for first-time founders. A theme-agnostic library of skills, flows, loops, and advisor agents covering the founder journey:
Idea & Validation → Build / MVP → Launch & GTM → Fundraise → Operate & Scale
Unsure where a founder is? Run the start-here skill first. Full map: docs/STAGES.md. Skills
live in skills/; flows in flows/; loops in loops/; advisor agents in agents/.
Operating principles (enforce every time)
- Research before asserting: verify checkable claims or label them assumptions; never invent market numbers or legal/tax thresholds.
- A draft is not a decision: name what needs the founder's human judgement.
- Batch, then decide: generate, gather all feedback, revise once.
- Ask before assuming: one tight question beats the wrong artifact.
- Route to the earliest unvalidated assumption: the highest-value work is upstream.
- Stay theme-agnostic: use the placeholder glossary; bake in no sector.
- Protect the founder: no secrets/PII in prompts; flag irreversible decisions; add the not-legal/financial-advice caveat on legal/finance/equity topics.
Learning loop
After any real outcome, run capture-learning to append a dated, sourced lesson to
knowledge-base/ (PRINCIPLES.md, DOS-AND-DONTS.md, PLAYBOOK-LESSONS.md). Append, never
overwrite. Read the KB before substantive work.
Tooling & attribution
Skills speak in actions, not tool names; mapping in docs/cross-platform-guide.md. Gemini CLI
equivalents: read_file, write_file/replace, run_shell_command, google_web_search.
Content CC-BY-4.0, code Apache-2.0. Attribution required: Founder OS by Adam M. Adamek
(Impact Brussels ASBL).
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.
- 3d ago First seen · 41 lines · 530 tokens per session scan A 18a561e5bd61
FounderOS GEMINI.md is an instructions file published in the GitHub repository impactbrussels/FounderOS (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 530 tokens to every session, about $0.0027 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.
Other instructions, from other repositories
founder-decision-agent AGENTS.md
AGENTS.md instructions for flame211186/founder-decision-agent, covering agent development operating rules, 1. 每次工作前必须恢复项目状态, 2. 质量优先规则, 3. 需求与决策管理 and 4. 事实、推断与反幻觉.
open-pencil copilot-instructions.md
Copilot instructions for open-pencil/open-pencil, covering openpencil copilot instructions, pull request requirements, validation and code conventions.
openscreen AGENTS.md
Instructions for getopenscreen/openscreen, covering agents.md, setup commands, development principles, project layout and code style.
openstatus AGENTS.md
AGENTS.md instructions for openstatusHQ/openstatus, covering agents.md, verify your change, toolchain, architecture and tests.
openstatus CLAUDE.md
Claude Code instructions for openstatusHQ/openstatus, covering claude.md and investigating production with polylane.
abap2UI5 CLAUDE.md
Instructions for abap2UI5/abap2UI5: All project guidance lives in AGENTS.md — the single source of truth for this repository (architecture and the layered design, the src/00-99 packages, the generated app/webapp mirror, the build and delivery pipeline, the CI gates and ABAP code style).