Claudesidian is a preconfigured Obsidian vault structure that lets Claude Code help manage a personal knowledge base as a thinking partner. It is for people who organize notes and other knowledge in Obsidian, with Git-based version control and optional integrations for image analysis and web research. The catalogue add-ons provide Claude Code skills, agents, hooks, and settings for working with this vault.
Borrowing it
Nothing to install: this file belongs to heyitsnoah/claudesidian. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/heyitsnoah/claudesidian/main/.agents/skills/add-frontmatter/SKILL.mdgit clone --depth 1 https://github.com/heyitsnoah/claudesidianWrote 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/heyitsnoah/claudesidian/add-frontmatter)<a href="https://agentmods.dev/skills/heyitsnoah/claudesidian/add-frontmatter"><img src="https://agentmods.dev/badge/skills/heyitsnoah/claudesidian/add-frontmatter/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/heyitsnoah/claudesidian/add-frontmatter"><img src="https://agentmods.dev/badge/skills/heyitsnoah/claudesidian/add-frontmatter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00052 | $0.00952 |
| Opus 5 | $0.00026 | $0.00476 |
| Sonnet 5 | $0.00010 | $0.00190 |
| Haiku 4.5 | $0.00005 | $0.00095 |
Grade A, and why
add-frontmatter 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You will analyze Obsidian notes and add intelligent YAML frontmatter properties to enhance organization and discoverability.
Input
- Path: file or folder to process
- Current date: use the system date
Your Task
Step 1: Identify Notes to Process
# If single file
Read the specified file
# If folder
Find all .md files in folder
Step 2: Analyze Note Content
For each note, examine:
- Main topics and themes
- Note type (meeting, daily, reference, project)
- Key entities (people, projects, dates)
- Existing properties (preserve valid ones)
- Title quality (add/improve if needed)
Step 3: Generate Appropriate Properties
Standard Properties by Note Type
Meeting Notes:
---
title: [Descriptive meeting title]
date: YYYY-MM-DD
type: meeting
attendees: ['Person 1', 'Person 2']
project: Project Name
tags: [meeting, project-name]
action_items:
- 'Action item 1'
- 'Action item 2'
status: complete
---
Daily Notes:
---
title: Daily Note - YYYY-MM-DD
date: YYYY-MM-DD
type: daily-note
tags: [daily]
highlights:
- 'Key event or thought'
mood: productive
---
Reference/Article Notes:
---
title: [Article or concept title]
type: reference
source: "[[Source Note]]" or URL
author: Author Name
date_saved: YYYY-MM-DD
tags: [topic1, topic2]
key_concepts: [concept1, concept2]
---
Project Notes:
---
title: [Project Name - Component]
type: project
status: in-progress
deadline: YYYY-MM-DD
stakeholders: ['Person 1', 'Team 2']
tags: [project, area]
priority: high
---
Step 4: Apply Properties
For each note:
- Check for existing frontmatter
- Merge new properties (don't duplicate)
- Fix any deprecated formats:
tag→tagsalias→aliasescssclass→cssclasses
- Ensure valid YAML syntax
Step 5: Update File
# Format:
---
property: value
list_property: ['item1', 'item2']
date_property: YYYY-MM-DD
linked_property: '[[Note Name]]'
---
[Original content]
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.
- 10d ago First seen · 199 lines · 52 tokens per session scan A 6f943cd8e1aa
add-frontmatter is a skill published in the GitHub repository heyitsnoah/claudesidian (2,584 stars, last pushed 5mo ago), licensed MIT. It adds 52 tokens to every session and 952 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.
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