What is founder-os CLAUDE.md?

A set of project instructions for Founder OS, covering company details, customers, product differences, and how coding agents should size and verify work. It also sets limits for task size and explains when to split work into smaller tasks.

Use it to guide agents working on Founder OS, plan manageable coding tasks, preserve company context, and verify completed work against its requirements.

It gives agents shared context and reduces the risk of taking on work that is too large to finish or failing to check whether the requested result was actually delivered.

How cloudrepo-io/founder-os configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to cloudrepo-io/founder-os. 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/cloudrepo-io/founder-os/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/cloudrepo-io/founder-os

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/cloudrepo-io/founder-os/claude-md/github.svg)](https://agentmods.dev/instructions/cloudrepo-io/founder-os/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/cloudrepo-io/founder-os/claude-md"><img src="https://agentmods.dev/badge/instructions/cloudrepo-io/founder-os/claude-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/cloudrepo-io/founder-os/claude-md"><img src="https://agentmods.dev/badge/instructions/cloudrepo-io/founder-os/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,991 This file is loaded in full into every session.

When invoked 2,991 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.

Model	Per session	Once invoked
Fable 5.1	$0.02991	$0.02991
Opus 5.5	$0.01196	$0.01196
Sonnet 5.5	$0.00598	$0.00598
Haiku 4.5	$0.00299	$0.00299

Measured 2mo ago against content hash 3b29b06e395e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

founder-os CLAUDE.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 2mo 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.

CLAUDE.md · 380 lines

How it starts

The opening of the file, as written. The whole thing — 380 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Company Context

Product: {{PRODUCT_NAME}}
Type: {{COMPANY_TYPE}}
Tech Stack: {{PRIMARY_LANGUAGE}} / {{FRONTEND_FRAMEWORK}} / {{BACKEND_FRAMEWORK}} / {{DATABASE}} / {{CLOUD_PROVIDER}}

Differentiators

Target Customers

Agent Operating Principles

Story Sizing Rules

Every task must be completable in a single agent session (one context window). This prevents quality degradation from context compaction.

Guideline	Rule
Files modified	Maximum 3-5 files per task
Lines of context	If >2000 lines needed to understand, split the task
Uncertainty	When uncertain about scope, err on the side of smaller
Split pattern	Schema → Backend → Frontend → Integration

If a task is too big: Create subtasks and complete them sequentially, each in a fresh agent session.

Goal-Backward Verification

Before marking ANY task complete, agents MUST verify actual code achieves goals:

Verification Checklist

Re-read acceptance criteria from the original task
Trace through code to confirm each criterion is met
Can you demonstrate the user flow end-to-end?
What would break this in production?
If ANY criterion is not verifiably met, do not mark complete

Common Failures to Catch

Code compiles but doesn't actually implement the feature
Happy path works but error handling is missing
Tests pass but don't cover the actual requirements
UI renders but user flow is incomplete

Context Budgeting

Keep agent context usage under 50% of capacity. Quality degrades above this threshold.

Spawn fresh subagents for discrete tasks
Don't accumulate context across unrelated operations
When context grows large, summarize and hand off to fresh agent

Read the full file on GitHub · 380 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.

2mo ago First seen · 380 lines · 2,991 tokens per session scan A 3b29b06e395e

Subscribe to this mod's changes

founder-os CLAUDE.md is an instructions file published in the GitHub repository cloudrepo-io/founder-os (24 stars, last pushed 9mo ago), licensed MIT. It adds 2,991 tokens to every session, about $0.0120 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 2026-08-30.

founder-os CLAUDE.md next to 6 instructions from other repositories
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founder-os CLAUDE.mdcloudrepo-io/founder-os	Instructions file	24	9mo ago	MIT	A	2,991	Claude Code
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founder-os: Instructions file for Claude Code