What is the key difference between Vault Knowledge and Kastell?

Vault Knowledge belongs to the Security category with local stdio execution, while Kastell belongs to the Security category with local stdio execution.

How do I install Vault Knowledge or Kastell in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Vault Knowledge and Kastell free or paid?

Vault Knowledge operates under a Free / Open Source model (No auth required). Kastell operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Vault Knowledge lists 3 tools with 3 views and 0 GitHub stars. Kastell lists 6 tools with 4 views and 59 GitHub stars.

Can I use both Vault Knowledge and Kastell together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Vault Knowledge vs Kastell

In-depth architectural comparison of the Vault Knowledge and Kastell MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Vault Knowledge

Security · Local stdio

Quality: 57/100 (Good) | Auth: No auth required

Kastell

Security · Local stdio

Quality: 63/100 (Good) | Auth: No auth required

Verdict Summary: Choose Vault Knowledge if you need specialized Security tools running via a local process. Choose Kastell if your workspace requires Security integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Vault Knowledge when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: VAULT_DB, VAULT_ROOT.
Primary tools included: search_concepts, find_contradictions, get_article.

Explore Vault Knowledge Details

Choose Kastell when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
Primary tools included: Server security audits with remediation, SSH hardening and fail2ban setup, UFW firewall management.

Feature & Specification Comparison

Specification	Vault Knowledge Security	Kastell kastelldev Security
Summary	Read-only MCP over a vault's typed knowledge graph: concept search, contradictions, article fetch.	Server security auditing and hardening toolkit. 413 security checks across 29 categories (SSH, Firewall, Docker, TLS, HTTP Headers), CIS/PCI-DSS/HIPAA compliance mapping, 19-step production hardening, fleet management, and forensic evidence collection. Supports Hetzner, DigitalOcean, Vultr, and Linode. 13 MCP tools.
Category & Scope	Security

Tools & Capabilities Breakdown

Vault Knowledge Tools (3)

search_concepts

Semantically search the vault's concept, connection, and Q&A articles for a natural-language query. Returns ranked {slug, title, similarity_score, excerpt, last_modified}. Read-only.

find_contradictions

Traverse the typed reasoning graph for active 'contradicts' edges — the sharpest of six relation types. scope='all' or 'recent_30d'. Returns {from_slug, to_slug, confidence, surfaced_at, source_run_id}. Read-only.

get_article

Fetch one article by slug with frontmatter, body, and resolved inbound/outbound wikilinks. Reads only files under the configured knowledge allowlist. Read-only.

Kastell Tools (6)

Server security audits with remediation

SSH hardening and fail2ban setup

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Vault Knowledge Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "vault-knowledge": {
      "command": "npx",
      "args": [
        "-y",
        "@swins/vault-knowledge-mcp"
      ],
      "env": {
        "VAULT_DB": "YOUR_VAULT_DB_HERE",
        "VAULT_ROOT": "YOUR_VAULT_ROOT_HERE"
      }
    }
  }
}

Kastell Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "kastelldev-kastell": {
      "command": "npx",
      "args": [
        "-y",
        "kastell"
      ]
    }
  }
}

Frequently Asked Questions

Vault Knowledge is categorized under Security and uses a local stdio subprocess. In contrast, Kastell belongs to Security using local stdio subprocess. Select Vault Knowledge when you need capabilities focused on security and Kastell when you require tools for security.

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