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Second Brain Ingest

Turns raw sources dropped into a vault into source, concept and entity pages that are linked in both directions, with index and log updated in the same run.

Docs & OfficeIntermediate★ 288⑂ 50AI score 8/10Last updated: Sep 23, 2026

What it does

  • Reads the source completely (file in raw/, pasted article, transcript, PDF) before writing, then creates a source page in wiki/sources/ recording claims as claims with attribution.
  • Searches the existing vault first, so ingesting into a 300-page vault mostly updates pages instead of duplicating them; contradictions are recorded side by side rather than overwritten.
  • Enforces the core rule "nothing is ingested until it is linked": source → concepts/entities and back again, with missing targets either created or listed under Gaps in index.md.
  • Updates index.md and appends to log.md in the same run, then prints a fixed report (new pages, updated pages, links added, contradictions, gaps).
  • Includes calibration guidance so one article yields one to three real concepts, not ten restated paragraphs.

Who it's for

  • Obsidian / markdown wiki and Zettelkasten users running a personal knowledge vault.
  • Researchers and writers whose clipped articles pile up unlinked and unfindable.
  • Anyone who wants consistent, auditable note ingestion instead of ad-hoc summaries.

Examples

  1. Drop raw/karpathy-llm-wiki.md and say "ingest this" → one source page, new [[LLM wiki]] concept, [[Andrej Karpathy]] entity, updates to [[Obsidian]] and [[Claude Code]], 11 links added.
  2. Paste a conference transcript and say "add this to my second brain" → only the one to three durable ideas become their own pages; the rest stays inside the source page.
  3. Ask "catch up on unprocessed sources" → each raw file is ingested in turn and every run is appended to log.md.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/undefined-ui/second-brain-os/HEAD/skills/second-brain-ingest/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/second-brain-ingest folder from the GitHub repo undefined-ui/second-brain-os into my ~/.claude/skills/second-brain-ingest/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/undefined-ui/second-brain-os.git && mkdir -p ~/.claude/skills && cp -r second-brain-os/skills/second-brain-ingest ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal.
  2. Clone the repo: git clone https://github.com/undefined-ui/second-brain-os.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r second-brain-os/skills/second-brain-ingest ~/.claude/skills/
  5. Make sure your vault has raw/, wiki/sources/, index.md and log.md — create them if missing.
  6. Run claude from inside your vault directory, drop a file into raw/, and say "ingest this" to trigger the skill.
  7. Commit or back up the vault before the first run so you can diff the reported new/updated pages.
View source on GitHub ↗License: MIT