Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ngmeyer/librarian-mcp --skill skillgit clone --depth 1 https://github.com/ngmeyer/librarian-mcpWrote 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.
[](https://agentmods.dev/skills/ngmeyer/librarian-mcp/skill)<a href="https://agentmods.dev/skills/ngmeyer/librarian-mcp/skill"><img src="https://agentmods.dev/badge/skills/ngmeyer/librarian-mcp/skill/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.
<a href="https://agentmods.dev/skills/ngmeyer/librarian-mcp/skill"><img src="https://agentmods.dev/badge/skills/ngmeyer/librarian-mcp/skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00035 | $0.06481 |
| Opus 5.5 | $0.00014 | $0.02592 |
| Sonnet 5.5 | $0.00007 | $0.01296 |
| Haiku 4.5 | $0.00003 | $0.00648 |
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 1mo 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.
- If `[session]` is a project name or path fragment, find matching project directory under `~/.claude/projects/` How it starts
The opening of the file, as written. The whole thing — 767 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/librarian
Orchestrate high-level knowledge workflows using Librarian MCP tools.
Prerequisites
Librarian MCP server must be configured and running. Verify by checking that library_stats responds. If it fails, tell the user to run librarian-mcp --setup /path/to/vault and restart Claude.
Commands
/librarian ingest [path] Ingest a solution doc into the vault
/librarian import <file> Convert local document (PDF, DOCX, image) to vault markdown
/librarian from gmail <query> Import Gmail threads matching a search into the vault
/librarian from web <url> Import any web page into the vault as markdown
/librarian from twitter <url> Import an X/Twitter thread into the vault
/librarian from calendar [query] Import calendar events/meeting notes into the vault
/librarian from claude [session] Extract learnings from a Claude Code session into the vault
/librarian search <query> Deep search vault for prior art
/librarian connect [path] Find and apply missing wikilinks
/librarian daily [text] Append a learning to today's daily note
/librarian graph [note] Explore vault structure or a note's neighborhood
/librarian analyze Full vault analysis: god nodes, communities, viz, report
/librarian daydream [focus] Discover non-obvious connections across vault notes
/librarian status Vault health overview
If no command is given, show the usage summary above.
ingest
Purpose: Import a docs/solutions/ file (or any local markdown) into the vault, gaining auto-wikilinks and knowledge graph integration. This is the bridge between per-project documentation (like ce:compound output) and the persistent vault.
Behavior
- Locate the source file:
- If
[path]is provided, use it directly - If no path, scan
docs/solutions/for the most recently modified.mdfile - If
docs/solutions/doesn't exist or is empty, tell the user and stop
- If
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.
- 1mo ago First seen · 767 lines · 35 tokens per session scan B 0f4aa4344106
librarian is a skill published in the GitHub repository ngmeyer/librarian-mcp (35 stars, last pushed 1mo ago), licensed MIT. It adds 35 tokens to every session and 6,481 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.
Other skills, from other repositories
wiki-lint
Health-check a wiki vault. Finds orphan pages (no inbound links), dead wikilinks (point to non-existent pages), missing frontmatter fields, stale claims, empty sections, and pages absent from catalog.md. Produces a structured report with severity tiers and proposes concrete fixes — but does not auto-apply them unless…
save
File the current Claude conversation (or a specific insight from it) as a structured wiki note. Auto-detects the right type (decision, answer, session-log, technique, ADR), writes appropriate frontmatter, places the file in the correct wiki folder, and updates catalog.md, journal.md, hot.md. Use when the user says…
wiki-export
Export a vault's wiki either as a single portable file (llms.txt or llms-full.txt per the llmstxt.org standard) or as an OKF knowledge bundle (Google's Open Knowledge Format v0.1 — a shareable directory of markdown files any AI agent can consume). Use when the user says "export my wiki", "make an llms.txt", "share my…
wiki
Bootstrap or check a Karpathy-style "LLM wiki" structure inside an Obsidian vault — a self-maintaining knowledge base where pages reference each other and the LLM keeps it tidy. Sets up catalog.md (curated page catalog), journal.md (append-only operation history), hot.md (recent-context cache), and overview.md…
wiki-query
Answer a question using ONLY the existing wiki vault as the knowledge base — no web search, no general LLM knowledge. Reads hot.md first (cheap recent context), then catalog.md to navigate, then drills into specific pages, then optionally semantic-searches the wiki, and synthesizes an answer with citations. Use when…
wiki-fold
Roll up the wiki's journal.md entries into structured fold pages — like 2^k log compaction. Reads the last 2, 4, 8, 16... entries and writes a fold page that summarizes them by extractive summarization (no invention), with backlinks to children. Idempotent at the structural level — re-running with the same window…