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basalt-mcp: Instructions file for Claude Code

CLAUDE.md

basalt-mcp CLAUDE.md is an instructions file for Claude Code from cmillstead/basalt-mcp. It costs 1,346 tokens per session, scanned A, original, MIT.

Project instructions for Basalt MCP, a security-focused server with tools for an Obsidian vault and a Git repository. Obsidian is a Markdown-based knowledge-base app, and Git stores code history.

In plain words
What is it for?
Use them when working on Basalt MCP, especially its vault tools, read-only Git tools, command-line setup, TypeScript build, tests, or lint checks.
Why use it?
They give an AI the project layout, security model, startup options, available tools, and common build and test commands.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md.

This is cmillstead/basalt-mcp's own configuration. It tells Claude Code how to work on basalt-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything basalt-mcp configures →

not rated 0repo 7mo ago A scan 1,346 tokens original MIT
View source ↗ cmillstead/basalt-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to cmillstead/basalt-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/cmillstead/basalt-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/cmillstead/basalt-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.

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README.md
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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.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/cmillstead/basalt-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/cmillstead/basalt-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,346 This file is loaded in full into every session.
When invoked 1,346 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01346 $0.01346
Opus 5.5 $0.00538 $0.00538
Sonnet 5.5 $0.00269 $0.00269
Haiku 4.5 $0.00135 $0.00135

Measured 1mo ago against content hash ca6c2b68f45e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

basalt-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 1mo 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 · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Project Overview

Basalt MCP is a security-hardened MCP server with two independent tool modules: Obsidian vault tools and git tools. The connected AI is treated as the attacker — see SECURITY.md for the full threat model.

Architecture

  • src/core/ — Shared security framework (validation, vault path, repo path, error sanitization)
  • src/tools/obsidian/ — Obsidian vault tool module (getAllFilenames, readMultipleFiles, getOpenTodos, updateFileContent, searchVault, appendToFile, listFiles)
  • src/tools/git/ — Git tool module (gitStatus, gitLog, gitDiff, gitBlame) — read-only, no mutations
  • src/index.ts — Server entrypoint, --vault/--repo flag parsing, conditional tool registration

The vault and repo are independent directories. The vault is a knowledge base (Obsidian markdown), the repo is a code repository (git). Either or both can be provided at startup.

CLI

node dist/index.js --vault <path> --repo <path>

At least one of --vault or --repo is required.

Commands

  • npm run build — Compile TypeScript
  • npm test — Run all tests (vitest)
  • npm run test:watch — Watch mode
  • npm run lint — Type-check without emitting
  • npm run dev — Watch mode compilation

Recent Security Notes

  • dist/ was rebuilt to match the hardened src/ tree. If you change security-sensitive code, run npm run build before relying on e2e results or publishing.
  • getAllFilenames and listFiles now emit _meta.contentTrust: "untrusted" with filename-specific warnings. Filenames are attacker-controlled strings and must not be treated as trusted UI content.
  • readMultipleFiles returns { found, notFound } in its envelope contract. Keep e2e expectations aligned with that shape.
  • re2 is an active production dependency for searchVault ReDoS protection. If install/build issues recur, verify node_modules/re2 is present before debugging TypeScript.
  • package.json uses overrides to pin patched transitive versions for @hono/node-server, express-rate-limit, hono, and tar. Do not remove these without re-running npm audit.
  • Current verification baseline: npm run lint, npm run build, npm test, and npm audit --omit=dev.

Read the full file on GitHub · 92 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.

  1. 1mo ago First seen · 92 lines · 1,346 tokens per session scan A ca6c2b68f45e

Subscribe to this mod's changes

basalt-mcp CLAUDE.md is an instructions file published in the GitHub repository cmillstead/basalt-mcp (0 stars, last pushed 7mo ago), licensed MIT. It adds 1,346 tokens to every session, about $0.0054 per session on Opus 5.5. 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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