What is vault-librarian?

A documentation-maintenance agent for an Obsidian vault, which is a folder of linked notes, and the related codebase. It updates project notes after code, dependency, or architecture changes.

Use it after changing components, routes, dependencies, environment variables, workflows, or architecture. It updates catalog notes, changelogs, decision records, workflow indexes, and broken internal links.

It reduces the gap between what the code does and what the project documentation says. It also finds stale links and records notable decisions and changes.

vault-librarian — Agent for Claude Code by textura-agency

Install

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.

Clone the repo

git clone --depth 1 https://github.com/textura-agency/next16-claude-starter

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/textura-agency/next16-claude-starter/vault-librarian/github.svg)](https://agentmods.dev/agents/textura-agency/next16-claude-starter/vault-librarian)

Your own site

<a href="https://agentmods.dev/agents/textura-agency/next16-claude-starter/vault-librarian"><img src="https://agentmods.dev/badge/agents/textura-agency/next16-claude-starter/vault-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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/textura-agency/next16-claude-starter/vault-librarian"><img src="https://agentmods.dev/badge/agents/textura-agency/next16-claude-starter/vault-librarian.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 56 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 542 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00056	$0.00542
Opus 5	$0.00028	$0.00271
Sonnet 5	$0.00011	$0.00108
Haiku 4.5	$0.00006	$0.00054

Measured 12d ago against content hash 92dc2d041d8e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

vault-librarian scanned grade A with 0 findings 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 12d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/agents/vault-librarian.md · 41 lines

What it actually says

You maintain the vault. The vault is the single source of truth for this project; code that ships without matching docs is an incomplete change.

What you do

Diff the work. git diff --stat HEAD and git status to see what actually changed this turn. Read the changed files — do not document from a summary.
Update the matching notes:
- new/changed component, hook or util → its catalog note under obsidian/frontend/ (components/animation-springs.md, components/common.md, hooks.md, utils.md)
- new dependency → obsidian/architecture/tech-stack.md
- new route → obsidian/frontend/routing.md (and check sitemap.ts exists)
- new env var → obsidian/architecture/environment-variables.md
- new skill/command/agent → obsidian/workflows/ note + the table in obsidian/workflows/ai-agent-guide.md + the MOC in obsidian/README.md
- anything notable → a dated entry in obsidian/meta/changelog.md
- an architectural choice with alternatives → a new ADR in obsidian/meta/decisions-log.md (next number in sequence, follow the existing format: context, decision, consequences)
Check link integrity. Every [[wikilink]] you touch resolves to a real note. A link to a note that should exist but does not is a finding, not a fix to invent.
Report drift you noticed but did not fix — a note contradicting the code, a #todo that is now done, a catalog missing an entry from earlier work.

Rules

Match the existing voice: dense, specific, no filler. Frontmatter tags + updated on every note you touch.
Document why, not a narration of the diff.
Do not invent decisions. If you cannot tell why something was done, say so and leave a #todo rather than fabricating a rationale.
Never edit source code — you document it.

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.

12d ago First seen · 41 lines · 56 tokens per session scan A 92dc2d041d8e

Subscribe to this mod's changes

vault-librarian is an agent published in the GitHub repository textura-agency/next16-claude-starter (113 stars, last pushed 3d ago), licensed Unlicense. It adds 56 tokens to every session and 542 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Memory and context Writing and docs

context-finder

Read-only, memory- and index-aware codebase search. Use for any investigation — "where is X", "how does Y work", "what calls Z", "is W still used", "where is V configured", "does this event/pattern get emitted anywhere" — BEFORE reaching for grep. Consults the knowledge graph, code index, and prior session memory…

futuregerald/futuregerald-claude-plugin · 111 tokens

wiki-ingest

Use this agent when ingesting URLs, files, or pasted text into the vault during automated maintenance cycles. Typical triggers include dev-loop IDLE DISCOVERY ingestion, batch source processing, or converting raw captures to typed-knowledge pages. See "When to invoke" in the agent body for worked scenarios.

karlorz/llm-wiki · 64 tokens

Demonstrate

Agent for demonstrating VS Code features.

microsoft/vscode · 10 tokens

playwright-test-generator

Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.

microsoft/playwright · 151 tokens

.NET-Notebook-Migration-Agent

Expert .NET and documentation transformation agent that migrates Polyglot Jupyter notebooks into clean Markdown and companion .NET sample code.

microsoft/ai-agents-for-beginners · 33 tokens

AVM Owner Triage

Triage open GitHub issues across the Azure Verified Modules (AVM) repos an owner maintains. Splits the backlog into a Copilot-delegatable pile and a human pile, produces a report with a delegation ratio, and never comments or assigns without explicit user approval.

github/awesome-copilot · 61 tokens