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Second Brain Backfill

Imports a large archive into your vault in oldest-first batches of ten, checkpointing and committing after each batch while keeping cost visible.

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

What it does

  • Triage first: skims titles and opening paragraphs to split sources into worth-ingesting, keep-in-raw, and delete.
  • Oldest first: prevents old sources from arriving as contradictions to pages that already hold the final answer.
  • Batches of ten with checkpoints: updates index.md, appends to log.md, commits with the batch range, reports counts, then stops for your go-ahead.
  • Cost control: if the archive exceeds roughly 200 sources, it proposes a filter instead of quoting the whole run.
  • Final full lint to clean up the orphans and duplicates bulk imports always leave behind.

Who it's for

  • Users already running the second-brain-os vault who need to migrate legacy material
  • Anyone with large exports from Notion, Obsidian, Raindrop, or a chat history dump
  • People who want bounded token spend with explicit stop points

Examples

  1. "Backfill five years of bookmarks (800 items)" → triage, filter proposal, then ten-at-a-time batches.
  2. "Import my whole Notion export folder" → date-sorted batches with per-batch commits and progress reports.
  3. "Bulk import the PDFs in Downloads" → read every page produced by batch one before continuing.

· · · 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-backfill/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-backfill folder from the GitHub repo undefined-ui/second-brain-os into my ~/.claude/skills/second-brain-backfill/.
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/* ~/.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 directory: mkdir -p ~/.claude/skills
  4. Copy the skills over: cp -r second-brain-os/skills/* ~/.claude/skills/ (copy all of them, since backfill relies on second-brain-ingest).
  5. Restart Claude Code and confirm second-brain-backfill appears in your skill list.
  6. Make sure your vault contains index.md and log.md, then ask: "backfill my bookmark archive".
View source on GitHub ↗License: MIT