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Agent skill

Obsidian

by laude-institute in laude-institute/headlong

Read, write, search, and manage notes in an Obsidian vault. An agent skill from laude-institute/headlong.

Apache-2.0Auto-check passedKnowledge Management

Install Obsidian

skills CLI
$ npx skills add laude-institute/headlong --skill obsidian -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install laude-institute/headlong obsidian --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/laude-institute/headlong.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/obsidian .claude/skills/obsidian && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
obsidian
GitHub stars
1.2k
Token cost
~880 tokens
SKILL.md length
278 words
Files
1
Skills in repo
10
Repo updated
First seen
Licence
Apache-2.0

At a glance

Read, write, search, and manage notes in an Obsidian vault. An agent skill from laude-institute/headlong.

  • Knowledge Management work in your project
  • SKILL.md covers Overview, Obsidian Sync, Filesystem operations and Tags, links, and metadata, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Obsidian is an agent skill from laude-institute/headlong. Read, write, search, and manage notes in an Obsidian vault

Its SKILL.md is about 880 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Knowledge Management. It works with Obsidian. The repository describes itself as: An open source agent microharness featuring persistent agency and recursive LLMs. Of bash, by bash, for bash; it's shells all the way down. The licence is Apache-2.0.

When your agent uses it

  • Knowledge Management work in your project

Example prompts

  • “/obsidian”

What it can do on your machine

Read from SKILL.md and the folder at commit c43e597. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash and yaml).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Obsidian loads about 880 tokens when it runs. Until then it costs about 17 tokens; SKILL.md has 278 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~17
When it runs · the whole SKILL.md, loaded when a task matches
~880

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from laude-institute/headlong at commit c43e597, republished under its Apache-2.0 licence (© laude-institute). 278 words, ~880 tokens.

Download SKILL.mdSave it as .claude/skills/obsidian/SKILL.md (or your agent's skills folder).
name
obsidian
description
Read, write, search, and manage notes in an Obsidian vault

obsidian — Obsidian vault management

Overview

An Obsidian vault is a folder of markdown files with a .obsidian/ config directory. The OBSIDIAN_VAULT environment variable must point to the vault root. All operations are filesystem-based — Obsidian detects changes automatically when running.

Obsidian Sync

Obsidian watches the vault directory for filesystem changes. When Obsidian is running, any file you create, edit, or delete is picked up and synced automatically (if Obsidian Sync or a sync plugin is configured). Never modify anything inside .obsidian/ directly.

Filesystem operations

Read a note
bash
cat "$OBSIDIAN_VAULT/path/to/note.md"
List notes
bash
# All notes
find "$OBSIDIAN_VAULT" -name '*.md' -not -path '*/.obsidian/*'

# Notes in a specific folder
ls "$OBSIDIAN_VAULT/folder/"*.md
Create a note
bash
cat > "$OBSIDIAN_VAULT/path/to/note.md" << 'EOF'
---
tags: [topic]
---

Note content here.
EOF
Edit a note (append)
bash
echo "New content" >> "$OBSIDIAN_VAULT/path/to/note.md"
Edit a note (overwrite)
bash
cat > "$OBSIDIAN_VAULT/path/to/note.md" << 'EOF'
Replacement content.
EOF
Search by content
bash
grep -rl "search term" "$OBSIDIAN_VAULT" --include='*.md' | grep -v '.obsidian/'
Search by filename
bash
find "$OBSIDIAN_VAULT" -name '*keyword*' -name '*.md' -not -path '*/.obsidian/*'
Move / rename
bash
mv "$OBSIDIAN_VAULT/old/path.md" "$OBSIDIAN_VAULT/new/path.md"

Note: Moving or renaming files does not automatically update [[wikilinks]] pointing to that note. If the note is linked from others, update those references manually or rely on Obsidian's built-in rename refactoring (which only works when Obsidian performs the rename via its UI).

Delete a note
bash
rm "$OBSIDIAN_VAULT/path/to/note.md"
Manage folders
bash
mkdir -p "$OBSIDIAN_VAULT/new/folder"
rmdir "$OBSIDIAN_VAULT/empty/folder"
Find notes with a tag
bash
grep -rl '#tagname' "$OBSIDIAN_VAULT" --include='*.md' | grep -v '.obsidian/'
Find notes linking to a page
bash
grep -rl '\[\[Page Name\]\]' "$OBSIDIAN_VAULT" --include='*.md' | grep -v '.obsidian/'
bash
# Find all notes that link to "My Note"
grep -rl '\[\[My Note\]\]' "$OBSIDIAN_VAULT" --include='*.md' | grep -v '.obsidian/'
Read frontmatter
bash
sed -n '/^---$/,/^---$/p' "$OBSIDIAN_VAULT/path/to/note.md"
Write frontmatter

When creating notes, include YAML frontmatter between --- markers at the top of the file:

yaml
---
tags: [tag1, tag2]
aliases: [alternate-name]
date: 2024-01-15
---

Conventions

  • Wikilinks: Use [[Note Name]] to link between notes. For sections: [[Note Name#Section]].
  • Tags: Use #tag inline or in frontmatter tags: [tag1, tag2].
  • Frontmatter: YAML between --- markers at the top of each file. Used for tags, aliases, dates, and custom metadata.
  • Daily notes: Typically stored in a daily/ or Daily Notes/ folder with YYYY-MM-DD.md naming.
  • Attachments: Images and files typically go in an attachments/ or assets/ folder.
  • Never touch .obsidian/: This directory contains Obsidian's configuration, plugins, and theme data. Modifying it directly can corrupt settings.

© laude-institute, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/obsidian of laude-institute/headlong.

Open the folder on GitHubat commit c43e597

Compare with similar skills

Obsidian next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Obsidian compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Obsidian this skilllaude-institute/headlong1.2k—~880Automated safety check: PassApache-2.0
Obsidian CLIAtmosphere/atmosphere3.8k13 repos~795Automated safety check: PassApache-2.0
Obsidian Canvas BoardsAgriciDaniel/claude-obsidian15k—~1.4kAutomated safety check: PassMIT
LLM Wikilewislulu/llm-wiki-skill655—~3.7kAutomated safety check: PassNone
Second BrainNicholasSpisak/second-brain737—~1.5kAutomated safety check: NotesNone
Codex History IngestAr9av/obsidian-wiki3.5k—~2.2kAutomated safety check: NotesMIT

Similar skills

  • Obsidian CLI

    Atmosphere/atmosphere

    Interact with Obsidian vaults using the Obsidian CLI to read, create, search, and manage notes, tasks, properties, and more.

    3.8k GitHub starsUsed in 13 repos~795 tokens
    Knowledge ManagementAuto-check passed

  • Obsidian Canvas Boards

    AgriciDaniel/claude-obsidian

    Creates, inspects and updates Obsidian JSON Canvas boards in a vault, with text, file, link, group and edge nodes, using safe recoverable edits.

    15k GitHub stars~1.4k tokensUpdated 1 mo ago
    Knowledge ManagementAuto-check passed

  • LLM Wiki

    lewislulu/llm-wiki-skill

    Build and maintain a Karpathy-style LLM knowledge base — a self-compiling Obsidian markdown wiki where an Agent ingests raw sources, compiles cross-linked concept/entity/summary pages, answers…

    655 GitHub stars~3.7k tokensUpdated 5 mo ago
    Knowledge ManagementAuto-check passed

  • Second Brain

    NicholasSpisak/second-brain

    Set up a new Obsidian knowledge base with the LLM Wiki pattern.

    737 GitHub stars~1.5k tokensUpdated 6 mo ago
    Knowledge ManagementAuto-check: notes

  • Codex History Ingest

    Ar9av/obsidian-wiki

    Ingest Codex CLI conversation/session history into Obsidian as distilled knowledge.

    3.5k GitHub stars~2.2k tokensUpdated yesterday
    Knowledge ManagementAuto-check: notes

  • Autograph

    smixs/agent-second-brain

    Schema-as-code enforcement for any Obsidian vault. An agent skill from smixs/agent-second-brain.

    393 GitHub stars~3.7k tokensUpdated 2 mo ago
    Knowledge ManagementAuto-check passed

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Works with

Categories

Questions about Obsidian

What does Obsidian do?

Read, write, search, and manage notes in an Obsidian vault. An agent skill from laude-institute/headlong. Obsidian is an agent skill from laude-institute/headlong.

When should I use Obsidian?

Obsidian fits situations like: knowledge Management work in your project.

How do I install Obsidian in Claude Code?

Run `npx skills add laude-institute/headlong --skill obsidian -a claude-code`. Or copy the skill folder (skills/obsidian in laude-institute/headlong) into .claude/skills/obsidian in your project. Claude Code loads it when a task matches its description.

How do I install Obsidian in Codex?

Run `npx skills add laude-institute/headlong --skill obsidian -a codex`. Or copy the skill folder (skills/obsidian in laude-institute/headlong) into .agents/skills/obsidian in your project. Codex loads it when a task matches its description.

Can I use Obsidian in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add laude-institute/headlong --skill obsidian -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/obsidian, .gemini/skills/obsidian, .github/skills/obsidian and .opencode/skills/obsidian in your project.

What does Obsidian need to run?

SKILL.md names no scripts, command-line tools or credentials: Obsidian is instructions for the agent only.

Does Obsidian access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Obsidian safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Obsidian use?

Obsidian is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Obsidian use?

About 880 tokens (SKILL.md is roughly 3.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Obsidian?

Skills that share tags, products or a category with Obsidian: Obsidian CLI (Atmosphere/atmosphere, 3.8k stars), Obsidian Canvas Boards (AgriciDaniel/claude-obsidian, 15k stars), LLM Wiki (lewislulu/llm-wiki-skill, 655 stars) and Second Brain (NicholasSpisak/second-brain, 737 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Obsidian?

laude-institute (a GitHub organization) maintains it in laude-institute/headlong, which has 1,216 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on October 9, 2026.

Source: laude-institute/headlong on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.