ai-brain

ai-brain is a skill for Claude Code from Ootto-AI/claude-content-skills. It costs 95 tokens per session (1,087 once invoked), scanned A, original, MIT.

A long-term memory system that stores important session notes as Markdown files in an Obsidian vault. Obsidian is a local note-taking app that links related notes together.

In plain words
What is it for?
Saving session summaries, remembering project details, recording decisions, tracking open questions, and recalling relevant past notes.
Why use it?
It prevents useful decisions, project context, preferences, and next steps from being lost when a session ends. The notes remain on disk under the user's control and can be searched later.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the claude-content-skills plugin — 52 skills shipped together

Good fit Saving session summaries, remembering project details, recording decisions, tracking open questions, and recalling relevant past notes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ootto-ai/claude-content-skills/ai-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 Ootto-AI/claude-content-skills --skill ai-brain
Clone the repo
git clone --depth 1 https://github.com/Ootto-AI/claude-content-skills

Made for: Claude Code.

Or install claude-content-skills, the plugin that ships this one along with the rest of its 52 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 ai-brain

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/ootto-ai/claude-content-skills/ai-brain"><img src="https://agentmods.dev/badge/skills/ootto-ai/claude-content-skills/ai-brain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 95 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,087 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 pass 7 Sept 2026
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 $0.00095 $0.01087
Opus 5 $0.00048 $0.00544
Sonnet 5 $0.00019 $0.00217
Haiku 4.5 $0.00010 $0.00109

Measured 12d ago against content hash 19a3bd575032, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

ai-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 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.

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/ai-brain/SKILL.md · 83 lines

How it starts

The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AI Brain — persistent memory for Claude via Obsidian

You maintain a long-term memory for the user in an Obsidian vault — a folder of Markdown notes the user owns on disk. The vault is the durable store; this skill is how you write to it and read from it. You reach the vault through the connected Filesystem MCP (read/write files in the vault folder). Notes live under an AI Brain/ folder; use Obsidian [[wikilinks]] and #tags so memories connect.

One-time setup: in Claude Desktop add the Filesystem connector pointed at your Obsidian vault (Settings → Developer → Edit Config). No browser automation, no login — it's just your local notes.

When the user says "wrap up" / "save this session" / "remember this" — SAVE

  1. Review the whole conversation. Pull out only what's worth remembering long-term:

    • Decisions made (and the reasoning / alternatives rejected)
    • Facts & context about the user, their project, their preferences
    • What was built / changed, and where it lives
    • Open questions and next steps (TODOs)
    • Anything they explicitly said "remember this" Ignore small talk, dead ends, and anything already saved.
  2. Write a structured Markdown note in this exact shape (Obsidian-friendly tags + links):

    # Session — <YYYY-MM-DD> — <3–6 word title>
    #ai-brain #<topic> #<topic>
    Related:: [[<other note>]], [[<project>]]
    ## Decisions
    - <decision> — <why>
    ## Context / facts to remember
    - <fact>
    ## Built / changed
    - <what> (<where>)
    ## Open / next
    - [ ] <todo>
    

    Keep it tight and skimmable — this is for future retrieval, not prose.

  3. Save it to the vault via the Filesystem MCP: write the note to AI Brain/<YYYY-MM-DD>-<slug>.md. If the AI Brain/ folder doesn't exist yet, create it first. Append-only — never overwrite a past session's note.

  4. Link it in. Add a one-line pointer to a AI Brain/MOC.md index (a map-of-content): - [[<YYYY-MM-DD>-<slug>]] — <one-line hook> so the brain stays browsable in Obsidian's graph.

Read the full file on GitHub · 83 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. 12d ago First seen · 83 lines · 95 tokens per session scan A 19a3bd575032

Subscribe to this mod's changes

ai-brain is a skill published in the GitHub repository Ootto-AI/claude-content-skills (30 stars, last pushed 20d ago), licensed MIT. It adds 95 tokens to every session and 1,087 once invoked, about $0.0005 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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