startup-os

startup-os is a skill for Claude Code from jordantplows/claude-skills. It costs 45 tokens per session (3,928 once invoked), scanned A, original, MIT.

A runtime that turns Markdown files into cooperating AI agents for different company departments. The agents run in parallel and share state through a company configuration file.

In plain words
What is it for?
Use it to build and run a simulated company with agents for strategy, finance, marketing, sales, legal, operations, and other departments.
Why use it?
It organizes recurring company work into separate agent roles instead of handling every department manually or in one conversation.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions Claude Code.

Part of the startup-os plugin — 3 skills shipped together

Good fit Use it to build and run a simulated company with agents for strategy, finance, marketing, sales, legal, operations, and other departments.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jordantplows/claude-skills/startup-os
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.

Any agent
npx skills add jordantplows/claude-skills --skill startup-os
Clone the repo
git clone --depth 1 https://github.com/jordantplows/claude-skills

Made for: Claude Code.

Or install startup-os, the plugin that ships this one along with the rest of its 3 skills.

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.

agentmods badge for startup-os

README.md
[![agentmods](https://agentmods.dev/badge/skills/jordantplows/claude-skills/startup-os/github.svg)](https://agentmods.dev/skills/jordantplows/claude-skills/startup-os)
Your own site
<a href="https://agentmods.dev/skills/jordantplows/claude-skills/startup-os"><img src="https://agentmods.dev/badge/skills/jordantplows/claude-skills/startup-os/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.

agentmods 80×15 button for startup-os

Your own site · 80×15
<a href="https://agentmods.dev/skills/jordantplows/claude-skills/startup-os"><img src="https://agentmods.dev/badge/skills/jordantplows/claude-skills/startup-os.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,928 The whole file, excluding the scripts and references it only reads on demand.
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 $0.00045 $0.03928
Opus 5 $0.00023 $0.01964
Sonnet 5 $0.00009 $0.00786
Haiku 4.5 $0.00005 $0.00393

Measured 11d ago against content hash 6fa55e6db35d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

startup-os 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 11d 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/skills/startup-os/SKILL.md · 552 lines

How it starts

The opening of the file, as written. The whole thing — 552 lines — stays where its author put it; the contents beside it link to each section on GitHub.

startup-os · company runtime

This is not a document generator. This is a company operating system.

What it actually is

startup-os is a programming language where .md files ARE the source code.

Each .md file in the department folders and core/ is a self-contained agent with:

  • Frontmatter (name, description, role, watches)
  • Instructions (what this agent does)
  • TypeScript (how it executes)
  • Coordination (how it talks to other agents)

The src/ TypeScript runtime loads these .md files and executes them as parallel processes. They coordinate through company.os.json - no direct agent-to-agent calls.

You (the founder) are the only human. Your job is to answer questions agents surface.

Commands

/startup-os build ""

Instantiates a company from an idea.

What happens:

  1. Parse the idea into initial company profile
  2. Ask 3 clarifying questions:
    • What stage? (idea/validating/building/revenue)
    • Who's your first customer? (be specific)
    • What must be true for this to work? (key assumption)
  3. Write answers to company.os.json
  4. Load all .md agents from disk
  5. Initialize each agent's department in company.os
  6. Boot all agents in parallel
  7. CEO gives first briefing with cross-department status

Example:

/startup-os build "AI-powered code review for security teams"

You'll get a briefing like:

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 SecureCode · CEO
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

 WHAT WE'RE BUILDING
 AI code review that catches security issues before manual review.
 For security engineers at Series B+ SaaS companies.

 WHAT YOUR DEPARTMENTS ARE DOING
 Product    → Defining MVP scope
 Legal      → Reviewing AI liability for false negatives
 Red Team   → Challenging "security teams want automation"

 FIRST DECISION I NEED
 Do you want prototype (2 weeks) or full MVP (8 weeks)?
 
 → [Type your answer]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

/startup-os ask

Read the full file on GitHub · 552 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. 11d ago First seen · 552 lines · 45 tokens per session scan A 6fa55e6db35d

Subscribe to this mod's changes

startup-os is a skill published in the GitHub repository jordantplows/claude-skills (1 stars, last pushed 2mo ago), licensed MIT. It adds 45 tokens to every session and 3,928 once invoked, about $0.0002 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.

Related

Other skills, from other repositories

google-agents-cli-scaffold

This skill should be used when the user wants to "create an agent project", "start a new ADK project", "build me a new agent", "add CI/CD to my project", "add deployment", "enhance my project", or "upgrade my project". Part of the agents-cli skills suite. Covers agents-cli scaffold create, scaffold enhance, and…

google/agents-cli · 135 tokens

google-agents-cli-publish

This skill should be used when the user wants to "publish an agent", "publish my ADK agent", "register an agent with Gemini Enterprise", "publish to Gemini Enterprise", or needs guidance on the agents-cli publish gemini-enterprise command. Also use when the user wants to "manage agents in Agent Registry"…

google/agents-cli · 141 tokens

graph-mutation-plan

Cookbook for composing an applygraphmutations plan — stable entitykey patterns, the canonical label/edge vocabulary, evidence/invalidation/confidence discipline, and a worked example. Load this when building a non-trivial mutation plan.

potpie-ai/potpie · 51 tokens

potpie-cli

Use when the task is centered on running, explaining, configuring, or troubleshooting the potpie command: doctor, login, pot management, source registration, search, graph workbench reads/writes, and pot scope behavior.

potpie-ai/potpie · 50 tokens

potpie-change-timeline

Use when an agent needs recent or historical change context: what changed recently, regressions, merged PRs, tickets, docs, incidents, deployments, releases, and source-history ingestion.

potpie-ai/potpie · 43 tokens

potpie-infra-architecture

Use for project infra and architecture context: environments, adapters, runtime configuration, deployments, service dependencies, datastores, API contracts, ownership, incidents, and dependency blast radius.

potpie-ai/potpie · 43 tokens