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SecondBrain: Skill for Claude Code

.claude/skills/second-brain-setup/SKILL.md

second-brain-setup is a skill for Claude Code from PieroSierra/SecondBrain. It costs 34 tokens per session (2,781 once invoked), scanned B, original, no licence file.

A setup tool for a Second Brain vault, meaning a structured personal knowledge store. It creates or updates folders, records interests, configures Craft imports, and generates CLAUDE.md instructions.

In plain words
What is it for?
Use it to initialise or update the vault structure, define interests, set the Craft import scope, and create CLAUDE.md.
Why use it?
It removes the initial folder and configuration work needed to start or maintain this kind of knowledge store.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

This is PieroSierra/SecondBrain's own configuration. It tells Claude Code how to work on SecondBrain itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything SecondBrain configures →

not rated 159repo +1 changed 2mo ago B scan 34 tokens no licence
View source ↗ PieroSierra/SecondBrain
Reuse

Borrowing it

Nothing to install: this file belongs to PieroSierra/SecondBrain. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/PieroSierra/SecondBrain/main/.claude/skills/second-brain-setup/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/PieroSierra/SecondBrain

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for second-brain-setup

README.md
[![agentmods](https://agentmods.dev/badge/skills/pierosierra/secondbrain/second-brain-setup/github.svg)](https://agentmods.dev/skills/pierosierra/secondbrain/second-brain-setup)
Your own site
<a href="https://agentmods.dev/skills/pierosierra/secondbrain/second-brain-setup"><img src="https://agentmods.dev/badge/skills/pierosierra/secondbrain/second-brain-setup/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for second-brain-setup

Your own site · 80×15
<a href="https://agentmods.dev/skills/pierosierra/secondbrain/second-brain-setup"><img src="https://agentmods.dev/badge/skills/pierosierra/secondbrain/second-brain-setup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,781 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00034 $0.02781
Opus 5.5 $0.00014 $0.01112
Sonnet 5.5 $0.00007 $0.00556
Haiku 4.5 $0.00003 $0.00278

Measured 2mo ago against content hash e332fe9c609c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

second-brain-setup scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

**Codex + Craft only:** if the chosen engine is Codex *and* a Craft space was configured, Codex reads MCP servers from `~/.codex/config.toml`, not from the agent file. Show the user the block to add there:
.claude/skills/second-brain-setup/SKILL.md · 275 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago Changed · +25 lines e332fe9c609c
  2. 2mo ago First seen · 250 lines · 34 tokens per session scan B 67d41e96e514

Subscribe to this mod's changes

second-brain-setup is a skill published in the GitHub repository PieroSierra/SecondBrain (159 stars, last pushed 1mo ago), with no licence file. It adds 34 tokens to every session and 2,781 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Memory and context
Related

second-brain-setup compared with skills from other repositories

second-brain-setup next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
second-brain-setupPieroSierra/SecondBrainSkill1591mo agononeB34Claude Code
knowledge-ingestopenclaw/openclawSkill394kyesterdayMITA80Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0Skill68k2d agoApache-2.0A217Claude Code, Codex
forgetasgeirtj/system_prompts_leaksSkill71k2d agoCC0-1.0A74Claude Code, Codex
Cortexdanielmiessler/LifeOSSkill20kyesterdayMITA184Claude Code
memoryopensquilla/opensquillaSkill7.1k6d agoApache-2.0A44Claude Code, Codex
ha-data-storesshiwenwen/hope-agentSkill1.9kyesterdayMITA115Claude Code, Codex