What is build-my-business-brain?

A document-building skill that combines a business's existing foundation files into one BUSINESS-BRAIN.md file. That file records the business context other AI employees use, while unsupported information is marked as a gap.

Use it to collect information about positioning, customers, voice, offers, proof, goals, and business operations, then identify what still needs to be supplied.

It prevents downstream assistants from relying on vague or invented details and gives them one shared source of truth.

build-my-business-brain — Skill for Claude Code by danielpaulai

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 danielpaulai/Purely-Personal-Run-a-business-by-itself --skill build-my-business-brain

Clone the repo

git clone --depth 1 https://github.com/danielpaulai/Purely-Personal-Run-a-business-by-itself

Made for: Claude Code.

Or install ai-employee-bootcamp, the plugin that ships this one along with the rest of its 26 skills, 1 command.

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/skills/danielpaulai/purely-personal-run-a-business-by-itself/build-my-business-brain/github.svg)](https://agentmods.dev/skills/danielpaulai/purely-personal-run-a-business-by-itself/build-my-business-brain)

Your own site

<a href="https://agentmods.dev/skills/danielpaulai/purely-personal-run-a-business-by-itself/build-my-business-brain"><img src="https://agentmods.dev/badge/skills/danielpaulai/purely-personal-run-a-business-by-itself/build-my-business-brain/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/skills/danielpaulai/purely-personal-run-a-business-by-itself/build-my-business-brain"><img src="https://agentmods.dev/badge/skills/danielpaulai/purely-personal-run-a-business-by-itself/build-my-business-brain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 163 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,627 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 1 finding. 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	$0.00163	$0.02627
Opus 5	$0.00081	$0.01314
Sonnet 5	$0.00033	$0.00525
Haiku 4.5	$0.00016	$0.00263

Measured 12d ago against content hash 1b5c0c50047d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade C, and why

build-my-business-brain scanned grade C with 1 finding 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 12d 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.

Tells the agent never to refusehighAnti-refusal

Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.

gap interview in Step 3. Never refuse to run because the folder is empty.

ai-employee-bootcamp/skills/build-my-business-brain/SKILL.md · 240 lines

How it starts

The opening of the file, as written. The whole thing — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build My Business Brain · Purely Personal

by Daniel Paul · Purely Personal

Read the reference file before writing a single section:

references/business-brain-template.md: the 8-section canonical Business Brain template this skill fills

One job: produce a BUSINESS-BRAIN.md so specific that every downstream skill sounds like this participant on its first run.

The brain is the single source of truth for the whole system. A vague brain makes every skill vague at once. A specific brain fixes them all at once. One real number beats three vague claims, every time.

WHERE THIS SKILL SITS

Reads from: every foundation document in the project or workspace folder Writes: BUSINESS-BRAIN.md, the one file every other skill reads FIRST Hands off to: /matchmaker to fit the first skill against the finished brain Tell the user the next step in one line after delivering.

STEP 0 · CONTEXT CHECK (always first, never skipped)

Find every source before writing anything. Check, in this order:

An existing BUSINESS-BRAIN.md (also accept business-brain.md and brain.md) in Project Knowledge, attached to the chat, or in the workspace folder. If one exists, this run becomes an UPDATE: keep every filled section exactly as it is, fill only the gaps, and never overwrite a real value with a guess.

The 7-file bootcamp convention. In claude.ai: the Project files. In Cowork or Claude Code: the connected workspace folder, its root, or a /docs or /foundation subfolder. The filenames:

File	Feeds template section
`icp-[name].md`	§2 ICP
`voice-dna-[name].md`	§5 Voice DNA
`positioning-[name].md`	§1 Identity, §7 Design Tokens
`messaging-[name].md`	§6 Messaging, §4 Proof
`rule1-[name].md`	§6 Messaging (Rule of 1)
`personal-story-[name].md`	§1 Identity (unique angle)
`business-inbox-[name].md` (alias `inbox-[name].md`)	§3 Offer, §8 Standing Facts

Any recognizable foundation document regardless of filename: a Voice DNA, ICP profile, Brand Positioning, Messaging House, offer doc, about page, sales page, pitch deck notes, testimonial list. If it holds real facts about this business, it is a source. Read it.
Nothing found: say so plainly, then build the brain entirely through the gap interview in Step 3. Never refuse to run because the folder is empty.

Read the full file on GitHub · 240 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/business-brain-template.md 3.2 KB

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.

12d ago First seen · 240 lines · 163 tokens per session scan C 1b5c0c50047d

Subscribe to this mod's changes

build-my-business-brain is a skill published in the GitHub repository danielpaulai/Purely-Personal-Run-a-business-by-itself (2 stars, last pushed 29d ago), licensed MIT. It adds 163 tokens to every session and 2,627 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it C with 1 finding (tells the agent never to refuse). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Documents Memory and context

obsidian

Obsidian vault: search/read/write notes, backlinks, Bases, Canvas.

steipete/agent-scripts · 19 tokens

loopx-doc-registry

Use when a connected LoopX project is asked to read, remember, record, index, register, or use a durable project material such as a Lark/wiki/design doc, research note, SOP, owner packet, migration report, benchmark paper, or external material source. Use even when the user does not mention LoopX or doc registry.

huangruiteng/loopx · 74 tokens

build-my-business-brain