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SecondBrain: Skill for Claude Code

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

second-brain-lint is a skill for Claude Code from PieroSierra/SecondBrain. It costs 30 tokens per session (1,979 once invoked), scanned C, original, no licence file.

A quality checker for a wiki, meaning a collection of linked knowledge pages. It looks for contradictions, claims without support, and missing content, then saves a structured report.

In plain words
What is it for?
Use it to review wiki/ pages and create reports in outputs/.
Why use it?
It helps find gaps and conflicting information before they make the wiki harder to trust or use.

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 1mo ago C scan 30 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-lint/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-lint

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/pierosierra/secondbrain/second-brain-lint"><img src="https://agentmods.dev/badge/skills/pierosierra/secondbrain/second-brain-lint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,979 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 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 $0.00030 $0.01979
Opus 5.5 $0.00012 $0.00792
Sonnet 5.5 $0.00006 $0.00396
Haiku 4.5 $0.00003 $0.00198

Measured 2mo ago against content hash ebc046d03bfd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

second-brain-lint scanned grade C 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- sb:proposal id="f1" confidence="high" instruction="[Exact natural-language instruction to pass to /second-brain-edit-wiki to resolve this contradiction — e.g. 'Date-stamp the 26% figure in skyscanner-company as inte
.claude/skills/second-brain-lint/SKILL.md · 184 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 First seen · 184 lines · 30 tokens per session scan C ebc046d03bfd

Subscribe to this mod's changes

second-brain-lint is a skill published in the GitHub repository PieroSierra/SecondBrain (159 stars, last pushed 1mo ago), with no licence file. It adds 30 tokens to every session and 1,979 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Writing and docs
Related

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second-brain-lint next to 6 skills from other repositories
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