build-personal-brain

build-personal-brain is a skill for Codex from mikeshu2001/personal-brain-builder. It costs 81 tokens per session (4,792 once invoked), scanned A, original, MIT.

A tool for building and maintaining a private memory shared across projects for an AI assistant. It can create, resume, validate, connect, and maintain that memory from local work folders and past assistant conversations.

In plain words
What is it for?
Use it to create a personal assistant memory, continue an interrupted memory review, connect existing memory to another local assistant, or check that the memory is valid.
Why use it?
It preserves useful context between projects and assistant sessions, so the owner does not have to explain the same background repeatedly. The source material stays separate from the generated memory.

Skill for Codex

Written for Codex: agents/openai.yaml present.

Good fit Use it to create a personal assistant memory, continue an interrupted memory review, connect existing memory to another local assistant, or check that the memory is valid.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mikeshu2001/personal-brain-builder/build-personal-brain
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 mikeshu2001/personal-brain-builder --skill build-personal-brain
Clone the repo
git clone --depth 1 https://github.com/mikeshu2001/personal-brain-builder

Made for: Codex.

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 build-personal-brain

README.md
[![agentmods](https://agentmods.dev/badge/skills/mikeshu2001/personal-brain-builder/build-personal-brain/github.svg)](https://agentmods.dev/skills/mikeshu2001/personal-brain-builder/build-personal-brain)
Your own site
<a href="https://agentmods.dev/skills/mikeshu2001/personal-brain-builder/build-personal-brain"><img src="https://agentmods.dev/badge/skills/mikeshu2001/personal-brain-builder/build-personal-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.

agentmods 80×15 button for build-personal-brain

Your own site · 80×15
<a href="https://agentmods.dev/skills/mikeshu2001/personal-brain-builder/build-personal-brain"><img src="https://agentmods.dev/badge/skills/mikeshu2001/personal-brain-builder/build-personal-brain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,792 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 153
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
  • medium Excessive Agency · line 447
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
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 $0.00081 $0.04792
Opus 5 $0.00041 $0.02396
Sonnet 5 $0.00016 $0.00958
Haiku 4.5 $0.00008 $0.00479

Measured 10d ago against content hash 0a6e7ea20cc6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

build-personal-brain 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 10d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (scripts/brainctl.py, scripts/card_engine.py, scripts/portable_history.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/build-personal-brain/SKILL.md · 482 lines

How it starts

The opening of the file, as written. The whole thing — 482 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build Personal Brain

Build one durable personal memory without making the owner understand the implementation. Treat the downloaded builder, the owner's source material, and the generated memory as three separate things:

  • the builder contains this skill, its references, templates, and control tool;
  • source material remains read-only during the initial build;
  • the generated memory lives in a separate owner-approved private directory.

Never create the generated memory inside this skill or inside the downloaded builder. Never copy personal knowledge back into this repository.

Speak to the owner

Use the owner's language. During onboarding, use ordinary words and one main question at a time. Explain the purpose, effect, and boundary of the next action before asking permission. Do not expose implementation terms such as Git, allowlist, frontmatter, runner, sentinel, schema, commit, or repository unless the owner asks for technical detail.

For a first run, read these files completely before replying:

  1. references/plain-language.md
  2. references/user-dialogue.md
  3. references/safety-rules.md
  4. references/state-machine.md

Use references/user-dialogue.md as a behavioral script, not as text to recite. Adapt each message to what is already known and never repeat answered questions.

Start or resume safely

On every invocation:

  1. Look only for a local .personal-brain-pointer.json, an owner-provided memory path, or a state file inside a selected memory.
  2. Do not inspect work folders while discovering prior progress.
  3. If exactly one pointer is found, show the exact separate memory location and obtain permission to check saved progress there. Only then load its work/setup/state.json and continue from its recorded state. Permission to read the downloaded builder does not permit opening the separate memory.
  4. If multiple memories or mismatched identities are found, show a short choice and do not select one.
  5. If the state is damaged or unexpected memory changes exist, stop the affected action and explain the concrete issue.
  6. If no memory exists, begin the compatibility check and introduction.

Read the full file on GitHub · 482 lines

Files

What ships with it

35 files 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.

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. 10d ago First seen · 482 lines · 81 tokens per session scan A 0a6e7ea20cc6

Subscribe to this mod's changes

build-personal-brain is a skill published in the GitHub repository mikeshu2001/personal-brain-builder (29 stars, last pushed 8d ago), licensed MIT. It adds 81 tokens to every session and 4,792 once invoked, about $0.0004 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 2026-08-30.

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