A skill for managing an Obsidian vault, a folder of linked notes used as a lasting knowledge base. It resolves the vault, checks its rules, creates and organizes typed notes, and recalls earlier information.

Use it to create or reclassify notes, update properties and links in bulk, maintain the vault's wiki structure, and retrieve information from earlier sessions.

It keeps important knowledge in one governed place rather than scattered across chat history, scratch files, or separate systems. Its checks help prevent misplaced, duplicated, or incomplete notes.

obsidian — Skill for Claude Code by larsboes

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.

Any agent

npx skills add larsboes/Axon --skill obsidian

Clone the repo

git clone --depth 1 https://github.com/larsboes/Axon

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/skills/larsboes/axon/obsidian.svg)](https://agentmods.dev/skills/larsboes/axon/obsidian)

Your own site

<a href="https://agentmods.dev/skills/larsboes/axon/obsidian"><img src="https://agentmods.dev/badge/skills/larsboes/axon/obsidian.svg" alt="Measured on agentmods" height="20"></a>

Per session 136 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,650 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	$0.00136	$0.01650
Opus 5	$0.00068	$0.00825
Sonnet 5	$0.00027	$0.00330
Haiku 4.5	$0.00014	$0.00165

Measured 7d ago against content hash 1a244a749c60, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

obsidian 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 7d 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.

Packs/knowledge/skills/obsidian/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Obsidian

The vault is an Obsidian Life OS, not a code repo, and it is the one place knowledge is allowed to be durable. Anything worth keeping ends up here as a typed note — not in a session transcript, not in a scratch file, not in a second system beside the vault.

1 · Resolve and gate (always first, never hardcode)

VAULT=$(scripts/vault root)          # from the overlay's config/knowledge.toml
scripts/vault contract               # fails loudly if the contract is missing

Read $VAULT/Projects/Soma/Vault-Contract.md before creating, moving, or retyping any note. It owns placement, the no-doubling law, naming, and frontmatter typing. If it is missing, stop and say so — do not improvise structure. $VAULT/AGENTS.md is the vault-side pointer to the same file.

Three rules from it that gate every single write, restated because they are what goes wrong:

Type at birth. No note without type: + maturity: seedling + summary: + categories:.
One owner per kind of statement. A concept is Knowledge, a proper-noun instance is Atlas, a consumed work is Atlas/Media (ideas graduate to a Knowledge concept), what-happened is Atlas/Events + Journal, a pattern is Atlas/Reflections, a decision is the Project. Assert once; thread everywhere with [[links]].
Update the owner in place. A new note must earn its folder; a new folder needs 3+ notes.

2 · Read before you act

Almost everything already has a home. Grep the vault and open the owning note before answering a planning or "update my X" request — the job is to find where it lives, not to invent a new place. A note with no inbound or outbound link is a leak.

3 · Pick the reference

Task	Read
Wikilinks, embeds, callouts, properties	`references/markdown.md`
`.base` views, filters, formulas	`references/bases.md`
`.canvas` files	`references/canvas.md`
Obsidian CLI (notes, search, properties, plugin dev)	`references/cli.md`, then `obsidian help` — authoritative
Ingest a source · synthesize across notes · lint the wiki	`references/wiki.md`

Read the full file on GitHub · 111 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

7d ago First seen · 111 lines · 136 tokens per session scan A 1a244a749c60

Subscribe to this mod's changes

obsidian is a skill published in the GitHub repository larsboes/Axon (1 stars, last pushed today), licensed MIT. It adds 136 tokens to every session and 1,650 once invoked, about $0.0007 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 2026-08-31.

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