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claude: Agent for Claude Code

.claude/agents/librarian.md

librarian is an agent for Claude Code from script-development/claude. It costs 66 tokens per session (1,594 once invoked), scanned B, original, no licence file.

An agent for reviewing other code repositories to find skills and agents that could be shared or imported.

In plain words
What is it for?
Use it when checking repositories for new skills or agents, deciding what to maintain, and grading possible additions.
Why use it?
It helps identify useful updates across repositories instead of checking each codebase by hand.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is script-development/claude's own configuration. It tells Claude Code how to work on claude 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 claude configures →

not rated 3repo 9d ago B scan 66 tokens no licence
View source ↗ script-development/claude
Reuse

Borrowing it

Nothing to install: this file belongs to script-development/claude. 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/script-development/claude/main/.claude/agents/librarian.md
Clone the repo
git clone --depth 1 https://github.com/script-development/claude

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 librarian

README.md
[![agentmods](https://agentmods.dev/badge/agents/script-development/claude/librarian/github.svg)](https://agentmods.dev/agents/script-development/claude/librarian)
Your own site
<a href="https://agentmods.dev/agents/script-development/claude/librarian"><img src="https://agentmods.dev/badge/agents/script-development/claude/librarian/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 librarian

Your own site · 80×15
<a href="https://agentmods.dev/agents/script-development/claude/librarian"><img src="https://agentmods.dev/badge/agents/script-development/claude/librarian.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 66 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,594 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 $0.00066 $0.01594
Opus 5.5 $0.00026 $0.00638
Sonnet 5.5 $0.00013 $0.00319
Haiku 4.5 $0.00007 $0.00159

Measured 2mo ago against content hash c833ea3dbf19, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

librarian 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.

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

find <repo>/.claude/skills -name "SKILL.md" 2>/dev/null
.claude/agents/librarian.md · 165 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 · 165 lines · 66 tokens per session scan B c833ea3dbf19

Subscribe to this mod's changes

librarian is an agent published in the GitHub repository script-development/claude (3 stars, last pushed 9d ago), with no licence file. It adds 66 tokens to every session and 1,594 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agents
Related

librarian compared with agents from other repositories

librarian next to 6 agents from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
librarianscript-development/claudeAgent39d agononeB66Claude Code
playwright-test-generatormicrosoft/playwrightAgent100kyesterdayApache-2.0A151Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginnersAgent79kyesterdayMITA33Claude Code
AVM Owner Triagegithub/awesome-copilotAgent41kyesterdayMITA61Claude Code
code-revieweranthropics/claude-cookbooksAgent54k3d agoMITA52Claude Code
Pimcore Expertgithub/awesome-copilotAgent41kyesterdayMITA26Claude Code
Ultimate Transparent Thinking Beast Modegithub/awesome-copilotAgent41kyesterdayMITA11Claude Code