# Second Brain Metrics (agent 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/undefined-ui/second-brain-os |
| Skill path | skills/second-brain-metrics/SKILL.md |
| Skill name | second-brain-metrics |
| GitHub stars | 998 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 1 |
| Plugin marketplace | second-brain-os |
| Official | no |
| Works with | Claude Code, GitHub Copilot |
| Category | Data & analysis |
| Last commit | Sep 29, 2026 |

## 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.

## Add this skill

### Claude Code

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

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

### ChatGPT / Codex

```sh
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
```

### Cursor

```sh
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
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

---

Canonical page: https://appsgit.com/skills/undefined-ui-second-brain-metrics
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