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Second Brain Graph Analyser

Measures your note vault's link graph and reports orphan rate, average degree, components, hubs, bridges and clusters — plus what each number means for retrieval.

Data & AnalyticsIntermediate★ 288⑂ 50AI score 7/10Last updated: Sep 23, 2026

What it does

  • Runs the repo's scripts to compute your vault's link graph shape and returns a fixed-format report.
  • Four core metrics: orphan rate (healthy under 5%), average degree, component count (how fragmented the vault is), and stale-page rate (untouched 90+ days).
  • Flags hubs (pages that swallowed the graph, with split advice), bridges (pages holding clusters together), and names the clusters your vault is actually about.
  • Explains the meaning of each figure for question answering, not just the raw value.
  • Strictly read-only — it never fixes what it finds (that's second-brain-lint's job).

Who it's for

  • Obsidian / Logseq / markdown Zettelkasten and Second Brain users.
  • Anyone whose vault has grown to hundreds or thousands of notes and now feels hard to search.
  • People who want real structural signals instead of vanity metrics like page or word count.

Example uses

  • "Check the health of my vault graph" → pages, links, orphan rate, component distribution.
  • "Which pages are most connected and which are isolated?" → hub candidates with split suggestions plus the orphan list.
  • "Is my vault fragmented?" → component count, main-component share, and bridge-page analysis.

· · · 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-graph/SKILL.md

What I want: (describe your task here)

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↓ 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-graph folder from the GitHub repo undefined-ui/second-brain-os into my ~/.claude/skills/second-brain-graph/.
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-graph ~/.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-graph ~/.claude/skills/
  5. It depends on the repo's scripts/vault_stats.py, link_check.py and graph_export.py, so keep the cloned repo next to your vault or copy the scripts folder too.
  6. Verify Python 3 is available: python3 --version
  7. Start Claude Code inside your vault directory and ask: "analyse my vault graph health".
View source on GitHub ↗License: MIT