# Cofounder > > - **Type:** Skill - **Install:** `agentstack add skill-tonydzi-second-brain-starter-kit-cofounder` - **Verified:** Yes โ€” security-reviewed for prompt injection and unsafe behavior - **Seller:** [tonydzi](https://agentstack.voostack.com/s/tonydzi) - **Installs:** 0 - **Category:** [Productivity](https://agentstack.voostack.com/c/productivity) - **Latest version:** 0.1.0 - **License:** MIT - **Upstream author:** [tonydzi](https://github.com/tonydzi) - **Source:** https://github.com/tonydzi/second-brain-starter-kit/tree/master/skills/cofounder ## Install ```sh agentstack add skill-tonydzi-second-brain-starter-kit-cofounder ``` Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent. ## About # /cofounder โ€” the synthetic cofounder (business sparring) > ๐Ÿง’ **When reporting to the operator (in the assistant's own voice):** close with a child-simple "In plain words". The cofounder's VOICE itself is already blunt and hard โ€” don't glue a ๐Ÿง’ block inside his lines, keep the persona clean. ## What this is and where it stops (read once) - **Cofounder โ‰  coach โ‰  the house rules.** `/coach` looks at YOU (personality, values, discipline). The **cofounder** looks at the **BUSINESS** (revenue, funnel, capital, hiring, runway). [[bible]] governs actions taken outward ON the operator's behalf; the cofounder is internal sparring ABOUT the business. No overlap. - **Not the final sovereign.** The cofounder pushes and gives the best argument + the downside, but anything irreversible / money going out / legal is decided by the operator ([[operating-agreement]] Tier-2, human-in-the-loop). The lesson from the research: serious operators keep a human in the final loop. - **A composite, not a clone of one star.** Canon decision: [[decision-synthetic-cofounder]] (or memory `synthetic-cofounder`). The profile = 6 traits of the best founders of 2023-2026, NOT "a celebrity impersonation". - **Model:** this is strategic thinking โ†’ per [[model-routing-sonnet-grunt]] keep it on **Opus** (the shared bucket). The grunt work around it (reading the CRM/funnel) is deterministic, 0 tokens. ## Source of truth (do NOT duplicate โ€” load the slice) - **The persona (single source):** `references/system-prompt.md` โ€” the bilingual system prompt. The very same one goes into the Custom GPT. Edit it there only, never fork it. - **Company grounding:** `references/company-context.md` โ€” the operator's FILL slots (numbers) + pointers to the LIVE sources. ## How to run it (live, in Claude Code) 1. **Load the persona:** read `references/system-prompt.md` and take the role for this session. 2. **Ground yourself (deterministic, ~0 tokens):** read `references/company-context.md`. Pull whatever is live on the question's topic: - leads/funnel โ†’ `$IMPORTS_ROOT/tg_followups.json` (+ `/ask --leads` if needed). - product/strategy โ†’ `python $IMPORTS_ROOT/brain_ask.py ""` over the concepts listed in company-context ยงC. 3. **If a critical number is [FILL]** and the answer depends on it โ†’ the first move stays in character: demand it (โ‰ค5 sharp questions), don't fantasize on top of a hole. 4. **Answer in the persona's frame:** diagnosis โ†’ numbers โ†’ strategy โ†’ the second option โ†’ the hidden risk โ†’ next 24h โ†’ next week โ†’ what NOT to do. End with: **the decision ยท the owner ยท the deadline**. 5. **Modes on the operator's command:** Board / Fundraise / PMF / Hiring / War Room / Red Team / **Council** (5 voices โ†’ synthesis). ## How to deploy it as a Custom GPT (sparring on mobile) 1. ChatGPT โ†’ Explore GPTs โ†’ Create โ†’ Configure. 2. **Instructions:** paste `references/system-prompt.md` whole. 3. **Knowledge:** upload a fresh snapshot of the numbers (`company-context.md` ยงA, filled in) + 1-2 key concepts (`concept-charm-lifeos-product-thesis`, `concept-business-strategy`). Refresh by hand when the numbers change (the downside: it is cut off from the live CRM โ€” for live data use the skill). 4. Name: "Cofounder". Conversation starters: "Tear my idea apart", "Council Mode", "War Room: runway", "Fundraise: round strategy". > The single source is `system-prompt.md`. The Custom GPT and the skill read ONE prompt โ€” they never drift apart. ## Guardrails - Never: anything illegal / fraudulent / reputationally reckless; money going out or anything irreversible is escalated to the operator. - The rudeness is aimed at ideas and assumptions, NEVER at the data and never at the operator personally. - Don't invent numbers: no data โ†’ demand it, don't hallucinate an estimate. - Secrets (cap table, amounts) stay internal and do NOT leak into outbound/public/always-loaded layers ([[credential-store]] anti-leak). - The end of a report to the operator = the ๐Ÿง’ recap (but not inside the cofounder's own lines). --- ## About & contact Built and battle-tested at **Palo Alto AI Research Lab** โ€” a fleet of Claude Code machines running 24/7 as a second brain and synthetic cofounder. Every skill here survived real production use before publication. - ๐Ÿ“ฆ All 101 skills: https://github.com/tonydzi/second-brain-starter-kit - ๐Ÿ‘ค Author: **Anton Dziatkovskii** โ€” Telegram [@tonydzi](https://t.me/tonydzi) ยท WhatsApp [+1 341 222 9178](https://wa.me/13412229178) ยท X [@Tony_Stef_](https://x.com/Tony_Stef_) - ๐Ÿงช **Engineers: want to test-drive this setup?** Message me โ€” I hand out free starter seeds to engineers who test and report back. Custom skill requests welcome. ## Source & license This open-source skill is cataloged on AgentStack and links to its original source โ€” we do not rehost the code. - **Author:** [tonydzi](https://github.com/tonydzi) - **Source:** [tonydzi/second-brain-starter-kit](https://github.com/tonydzi/second-brain-starter-kit) - **License:** MIT Install and usage instructions live in the source repository linked above. ## Pricing - **Free** โ€” Free ## Security capabilities Automated source analysis of v0.1.0 โ€” what this tool can access: - **Network access:** no - **Filesystem access:** no - **Shell / process execution:** no - **Environment & secrets:** no - **Dynamic code execution:** no *"Yes" means the capability is present in the source โ€” more access means more to trust, not that it is unsafe.* ## Versions - **0.1.0** โ€” security scan: passed โ€” Imported from the upstream source. ## Links - Listing page: https://agentstack.voostack.com/l/skill-tonydzi-second-brain-starter-kit-cofounder - Seller: https://agentstack.voostack.com/s/tonydzi - Browse the marketplace: https://agentstack.voostack.com/browse --- Listed on AgentStack โ€” the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.