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Second Brain Metrics

Second Brain Metrics is an agent skill (a SKILL.md file) from undefined-ui/second-brain-os. Record a dated snapshot of the vault's health numbers and compare against previous snapshots so trends are visible. It works with Claude Code and GitHub Copilot and has 998 GitHub stars.

github.com/undefined-ui/second-brain-os/skills/second-brain-metrics (opens in a new tab)

View on GitHub (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add undefined-ui/second-brain-os
/plugin install agents-course@second-brain-os

In the Claude apps, zip the second-brain-metrics folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git
cp -r second-brain-os/skills/second-brain-metrics .agents/skills/second-brain-metrics   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git
cp -r second-brain-os/skills/second-brain-metrics .cursor/skills/second-brain-metrics   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Record a dated snapshot of the vault's health numbers and compare against previous snapshots so trends are visible. Use this skill for a monthly or quarterly check, when the user asks whether the vault is improving, or asks to track its numbers over time. Do NOT use for a one-off graph analysis, which is second-brain-graph, or for structural repairs. A single reading tells you almost nothing. Direction over months is the information, and nobody remembers what last quarter's orphan rate was.

When it triggers

  • Use this skill for a monthly or quarterly check, when the user asks whether the vault is improving, or asks to track its numbers over time.
  • use for a one-off graph analysis, which is second-brain-graph, or for structural repairs.

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FAQ

Second Brain Metrics FAQ

Still curious? Email info@appsgit.com.

What is the Second Brain Metrics skill?

Second Brain Metrics is an agent skill (a SKILL.md file) from undefined-ui/second-brain-os. Record a dated snapshot of the vault's health numbers and compare against previous snapshots so trends are visible. It works with Claude Code and GitHub Copilot and has 998 GitHub stars. Its SKILL.md lives at github.com/undefined-ui/second-brain-os/skills/second-brain-metrics.

How do I install the Second Brain Metrics skill?

In Claude Code, run /plugin marketplace add undefined-ui/second-brain-os and then /plugin install agents-course@second-brain-os. For Codex or Cursor, copy the second-brain-metrics folder into .agents/skills/ or .cursor/skills/.

Is the Second Brain Metrics skill free?

Yes. The repository is open source under the MIT license.

Is Second Brain Metrics maintained?

The repository's most recent commit was on Sep 29, 2026. appsgit only lists skills from repositories with a commit in the last six months.