cofounder SKILL.md skillA
cofounder from tonydzi/second-brain-starter-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add tonydzi/second-brain-starter-kit/cofounder@git:20261020.402f6b7Pins git:20261020.402f6b7 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- tonydzi/second-brain-starter-kit
- Path
skills/cofounder/SKILL.md- Versions recorded
- 9
- Latest version
- git:20261020.402f6b7, committed Oct 20, 2026
- First version recorded
- Aug 14, 2026
- Size
- 5,552 bytes
- Repository stars
- 14
- License
- MIT
Spar with the founder as a synthetic cofounder on business questions (revenue, funnel, pricing, fundraising, debt, hiring, runway) with numbered objections and no flattery, arguing to consensus instead of agreeing. Not a coach and not a chatbot. Triggers: "/cofounder", or any strategic business question.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# /cofounder — the synthetic cofounder (business sparring) > 🧒 **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 — don't glue a 🧒 block inside his lines, keep the persona clean. ## What this is and where it stops (read once) - **Cofounder ≠ coach ≠ 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". …
Read the whole file at its exact version.
How to install
mdr add tonydzi/second-brain-starter-kit/cofounder@sha256:18c8c59c055e8c3bThe line at the top of this page pins the label git:20261020.402f6b7, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_5zi2dkx67f57msew)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 9 versions of this file, between Aug 14, 2026 and Oct 20, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261020.402f6b7 latest | 2026-10-20 | 402f6b7 | 5,552 B | A | view · diff |
| git:20261007.cd6c208 | 2026-10-07 | cd6c208 | 5,558 B | A | view · diff |
| git:20261003.a2d662f | 2026-10-03 | a2d662f | 5,559 B | A | view · diff |
| v1.0.0 | 2026-09-24 | 2784cb2 | 9,837 B | A | view · diff |
| git:20260908.2ec1bf8 | 2026-09-08 | 2ec1bf8 | 5,564 B | A | view · diff |
| git:20260814.3d74bc3 | 2026-08-14 | 3d74bc3 | 5,324 B | A | view · diff |
| git:20260814.06fa906 | 2026-08-14 | 06fa906 | 6,815 B | A | view · diff |
| git:20260814.5023d8c | 2026-08-14 | 5023d8c | 6,120 B | A | view · diff |
| git:20260814.44e61cf | 2026-08-14 | 44e61cf | 6,690 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5552 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
tonydzi/second-brain-starter-kit · 14 stars · license MIT · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_5zi2dkx67f57msew GET https://markdownregistry.com/api/v1/resolve?ref=tonydzi/second-brain-starter-kit/cofounder GET https://markdownregistry.com/api/v1/blob/18c8c59c055e8c3babd75e6c5f0ecc6155fbc642d1e26a8686d06a4820965189
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.