agentmods.dev

FounderOS AGENTS.md

A set of instructions for agents working in FounderOS, an operating system for coordinating roles, skills, commands, and project knowledge.

In plain words
What is it for?
Use it when working in the FounderOS repository, especially its main instructions, README, skill registry, documentation, hooks, and role-based workflows.
Why use it?
It tells non-Claude coding agents where the authoritative instructions are and which parts of the project apply to them. This reduces the risk of following outdated or unsupported procedures.

Instructions file for CodexOpenCode

5 19d ago A scan 1,186 tokens original MIT
View the source file ARCASSystems/FounderOS
Install

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.

agentmods
npx agentmods add instructions/arcassystems/founderos/agents-md
Clone the repo
git clone --depth 1 https://github.com/ARCASSystems/FounderOS

Made for: Codex, OpenCode.

Per session 1,186 This file is loaded in full into every session.
When invoked 1,186 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.01186 $0.01186
Opus 5 $0.00593 $0.00593
Sonnet 5 $0.00237 $0.00237
Haiku 4.5 $0.00119 $0.00119

Measured 2d ago against content hash 459561602b4e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

FounderOS AGENTS.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 2d 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.

AGENTS.md · 51 lines

How it starts

The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.

FounderOS - Agent Instructions

A thin bridge for Codex, Cursor, Windsurf, Gemini, and other non-Claude agents operating in this repo.

The canonical instruction file is CLAUDE.md. It is the source of truth for how this OS behaves: what the repo is, the repo map, the six role modes (four active, two reference-until-invoked), the full skill and command lists, the brain substrate, the hooks, the wiki conventions, and what not to do. Read it in full. This file only carries the deltas a non-Claude agent needs on top of it. If anything here ever disagrees with CLAUDE.md, CLAUDE.md wins.

Read first

  1. CLAUDE.md - the source of truth for behaviour, structure, roles, skills, commands, hooks, and substrate.
  2. README.md - the product picture and the setup path.

The skill registry is skills/index.md (95 skills, 45 commands); the long-form per-skill reference is docs/skills.md. Read those for the lists rather than expecting them duplicated here.

Cross-agent deltas (what differs from a Claude Code session)

  • Slash commands are Claude Code specific. The 45 commands in .claude/commands/ cannot be run by a non-Claude agent. Treat them as documented procedures, not executable actions.
  • Skills are procedural reference. Each skills/<name>/SKILL.md has trigger frontmatter for Claude's auto-invocation (ignore that) and a protocol body that is portable. Follow the body by hand.
  • You cannot run hooks, MCP tools, slash commands, or local writes unless your environment actually supports them. Do not claim that setup, hooks, file writes, MCP authentication, or scheduled routines have run. Say plainly what you can and cannot do in this environment.
  • 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 your environment can write to the folder you may run a local-writes skill; if it cannot run a script you read the produced artifacts for a local-exec skill and say so. If anything here disagrees, CLAUDE.md wins.
  • Opinions of consequence: Claude has /founder-os:devil to run the output bias self-check. You do not. Follow rules/biases.md by hand - attach the strongest counter-case, a confidence level (high / medium / low), what evidence is absent, and the do-nothing option. Name the most likely bias and argue the other side; do not claim bias-free advice.
  • Do not modify the operator's data files (core/, context/, cadence/, brain/) without explicit instruction. Claude has approval-gates and hooks guarding this; you do not, so the burden is on you to ask first.
  • Empty state: if the six context files named in CLAUDE.md are missing, the OS is not set up. Do not invent identity, priorities, decisions, clients, or revenue. Point the user to the setup wizard and stop.

Read the full file on GitHub · 51 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. 2d ago First seen · 51 lines · 1,186 tokens per session scan A 459561602b4e

Subscribe to this mod's changes

FounderOS AGENTS.md is an instructions file published in the GitHub repository ARCASSystems/FounderOS (5 stars, last pushed 19d ago), licensed MIT. It adds 1,186 tokens to every session, about $0.0059 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.

Building agentsai-agentsclaude-codefounder-osllms-txtmarkdownoperating-system
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