What is vault-mcp CLAUDE.md?

Instructions for maintaining vault-mcp, a remote service that reads and changes a private GitHub-hosted Obsidian vault. Obsidian is a note-taking app that stores notes as files, and the instructions protect note paths, links, and restricted folders.

Use them when changing vault-mcp, especially its note reading, writing, or deletion logic.

They prevent code changes from adding unsafe file operations or bypassing path and file-type checks.

How wakita181009/vault-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to wakita181009/vault-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/wakita181009/vault-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/wakita181009/vault-mcp

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/instructions/wakita181009/vault-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/wakita181009/vault-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/wakita181009/vault-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/wakita181009/vault-mcp/claude-md/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/instructions/wakita181009/vault-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/wakita181009/vault-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 649 This file is loaded in full into every session.

When invoked 649 The same file — it is already loaded in full.

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	$0.00649	$0.00649
Opus 5	$0.00324	$0.00324
Sonnet 5	$0.00130	$0.00130
Haiku 4.5	$0.00065	$0.00065

Measured 10d ago against content hash f404136513a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

vault-mcp CLAUDE.md 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.

CLAUDE.md · 40 lines

How it starts

The opening of the file, as written. The whole thing — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.

vault-mcp

Authenticated remote MCP server (Cloudflare Workers) that exposes a private, GitHub-hosted Obsidian vault to claude.ai and Claude Code. Reads (list/read/search) plus two note mutations: write_note (create/overwrite) and delete_note — no rename/move. The target repo and access policy are configured through secrets; path-scope overrides default in src/config.ts, so wrangler.jsonc ships generic (no vars).

Invariants — keep these intact when changing code

Notes-only, no rename/move. The mutations are write_note (create/overwrite a markdown note) and delete_note (remove one). Never add a rename/move tool — the GitHub API has no atomic move and it would silently break Obsidian wikilinks. Never let a mutation touch non-note files — writeNote and deleteNote in vault.ts must keep enforcing the .md/.markdown extension check.
Writes and deletes obey the same path policy as reads. write_note and delete_note must run every guard read_note does — ../absolute rejection and VAULT_ALLOWED_PREFIXES / VAULT_DENIED_PREFIXES — so a mutation can never reach .git/, .obsidian/, or agent dirs. Preserve this when touching write/delete logic.
The login allowlist gates the whole toolset. A GitHub login absent from VAULT_ALLOWED_GITHUB_LOGINS must get zero tools, not a reduced set — see init in index.ts.
VAULT_GITHUB_TOKEN stays single-repo scoped. It needs Contents: Read and Write (Write covers both write_note and delete_note), but only on the vault repo. Never widen it beyond that one repo or swap in a broader token.
Path safety. vault.ts enforces VAULT_ALLOWED_PREFIXES / VAULT_DENIED_PREFIXES (defaults in src/config.ts; DEFAULT_DENIED_PREFIXES must keep hiding .git/, .obsidian/, and agent dirs) and rejects .. traversal and absolute paths in read_note, write_note, and delete_note. Preserve this when touching read/write/delete logic.

Conventions

Read the full file on GitHub · 40 lines

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.

10d ago First seen · 40 lines · 649 tokens per session scan A f404136513a6

Subscribe to this mod's changes

vault-mcp CLAUDE.md is an instructions file published in the GitHub repository wakita181009/vault-mcp (5 stars, last pushed 4d ago), licensed MIT. It adds 649 tokens to every session, about $0.0032 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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vault-mcp: Instructions file for Claude Code