C
castovdev/castov
Castov - 900+ Offline-First Developer Utilities, CLI Error Healer & VS Code Extension (Zero Telemetry)
no SECURITY.md
View on GitHub ↗Link checked 2026-11-12 · HTTP 200 · opens the vendor's own site
Install & config
- Copy the command above
- Paste it as one entry under
mcpServersinclaude_desktop_config.json— local servers take command + args (example: clients) - Restart your client
Client config (built from the install command this repo gives)
{
"mcpServers": {
"castovdev-castov": {
"command": "npx",
"args": ["-y", "castov", "mcp"]
}
}
}Parsed from the README we fetched on 2026-10-26; we have not executed it.
command/args come from the install command the repository states. When it is ambiguous, the project README wins.
VS Code (.vscode/mcp.json - the key is servers)
{
"servers": {
"castovdev-castov": {
"command": "npx",
"args": ["-y", "castov", "mcp"]
}
}
}Same server, but VS Code keeps it under <code>servers</code>.
Claude Code (command line)
claude mcp add --transport stdio castovdev-castov -- npx -y castov mcp
Claude Code does not read a config file; add the server with this command.
Key names differ by client: Clients & CLI
- Star count
- 1 ★ · castovdev/castov · read from the GitHub search API · (checked 2026-11-13 20:00:50)
- Source
- collected from the punkpeye/awesome-mcp-servers list · type: MCP server
- Harvest history
- first seen 2026-10-23 · last seen 2026-11-14 · seen 26× · listed by 23 sources
- Score
- score 2,300 · 1 ★ · 23 sources · mcp
- Install
npx -y castov mcp
FAQ (answers come from our records)
How do I install it?
The repository provides this install command:
npx -y castov mcp. It comes from the repository itself; we cannot guarantee it runs as-is in your client.Who is it for?
We filed it under these tags: MCP 服务. The tags come from the entry itself, not a taxonomy we imposed.
Who maintains it?
repository
castovdev/castov；first catalogued 2026-10-23；last seen 2026-11-14。There is no official certification or quality rating here — we record sources and dates only.# Castov
以下摘录自该仓库的 README（片段） · 在 GitHub 读完整 README →
The Open-Source AI Execution Layer & Privacy-First Developer Suite
Deterministic local tooling for Claude Desktop , Cursor , Windsurf , and Local LLMs via the Model Context Protocol (MCP) — backed by a high-performance CLI, Docker image, IDE extension, and 61 client-first browser utilities.
## ⚡ What is Castov?
Modern AI agents and developer workflows suffer from two critical flaws:
1. Agent Hallucinations on Exact Operations: LLMs frequently blunder arithmetic for CIDR network masks, time zone offsets, epoch milliseconds, and cryptographic key derivations.
2. Data & Secret Leakage: Sending system logs, environment variables, or tokens to third-party cloud APIs presents unacceptable security hazards.
Castov solves both. It acts as an in-situ Execution Layer for developer environments. It provides deterministic, offline, and instant utilities delivered directly to your terminal, editor, Docker containers, and AI agents through the Model Context Protocol (MCP).
Everything runs 100% locally. No external analytics, no telemetry, and zero cloud roundtrips.
### 📊 Castov vs Existing Solutions
| Feature / Capability | ⚡ Castov | 🕵️ CyberChef | 🛠️ DevToys | 🚀 Raycast | 📦 IT-Tools |
| 100% Client-Side Web Crypto | ✅ Yes | ✅ Yes | ❌ Native Only | ❌ Mac Only | ✅ Yes |
| Model Context Protocol (MCP) | ✅ Grade A Server | ❌ No | ❌ No | ❌ Proprietary | ❌ No |
| Terminal CLI (npx castov) | ✅ Built-in | ❌ No | ❌ Separate | ❌ Mac GUI | ❌ No |
| Zero Server Payload Logging | ✅ Air-Gap Safe | ✅ Yes | ✅ Yes | ⚠️ Telemetry | ✅ Yes |
| Cross-Platform (Web/OS/Docker)| ✅ Universal | ⚠️ Web Only | ⚠️ Desktop Only | ❌ macOS Only | ⚠️ Web Only |
| AI Editor Integration (Cursor/Claude) | ✅ Native | ❌ No | ❌ No | ❌ No | ❌ No |
| Process / Port Killer (EADDRINUSE) | ✅ Built-in | ❌ No | ❌ No | ⚠️ Extension | ❌ No |
| Secret & API Key Leak Scanner | ✅ Built-in | ❌ No | ❌ No | ❌ No | ❌ No |
| Open Source (MIT) | ✅ Yes | ✅ Apache 2.0 | ✅ MIT | ❌ Proprietary | ✅ GPL-3.0 |
## 🤖 AI Agent Setup (Model Context Protocol - MCP)
Castov ships with a built-in, production-grade JSON-RPC 2.0 stdio MCP server supporting both Content-Length framed and ndjson stream protocols.
### 1. Claude Desktop
Add Castov to your claudedesktopconfig.json:
macOS: ~/Library/Application Support/Claude/claudedesktopconfig.json
Windows: %APPDATA%\Claude\claudedesktopconfig.json
Linux: ~/.config/Claude/claudedesktopconfig.json
json
"mcpServers": {
"castov": {
"command": "npx",
"args": ["-y", "castov", "mcp"]
### 2. Cursor IDE & Windsurf
Go to Settings → Features → MCP Servers → Add New MCP Server:
Name: castov
Type: command
Command: npx -y castov mcp
Alternatively, add to your project's .cursor/mcp.json:
json
"mcpServers": {
"castov": {
"command": "npx",
"args": ["-y", "castov", "mcp"]
### Native Tools Exposed to Agents (10 Tools — All 100% Local & Read-Only)
| MCP Tool | Capability | Example Agent Prompt |
| castovport | Identifies listening services, protocol mappings, and inspects process collision | "Why is port 3000 busy and what service uses it?" |
| castovcidr | Calculates IPv4 subnet masks, wildcard, broadcast, and usable host count | "Calculate usable IP range and subnet mask for 10.240.0.0/22" |
Deterministic local tooling for Claude Desktop , Cursor , Windsurf , and Local LLMs via the Model Context Protocol (MCP) — backed by a high-performance CLI, Docker image, IDE extension, and 61 client-first browser utilities.
## ⚡ What is Castov?
Modern AI agents and developer workflows suffer from two critical flaws:
1. Agent Hallucinations on Exact Operations: LLMs frequently blunder arithmetic for CIDR network masks, time zone offsets, epoch milliseconds, and cryptographic key derivations.
2. Data & Secret Leakage: Sending system logs, environment variables, or tokens to third-party cloud APIs presents unacceptable security hazards.
Castov solves both. It acts as an in-situ Execution Layer for developer environments. It provides deterministic, offline, and instant utilities delivered directly to your terminal, editor, Docker containers, and AI agents through the Model Context Protocol (MCP).
Everything runs 100% locally. No external analytics, no telemetry, and zero cloud roundtrips.
### 📊 Castov vs Existing Solutions
| Feature / Capability | ⚡ Castov | 🕵️ CyberChef | 🛠️ DevToys | 🚀 Raycast | 📦 IT-Tools |
| 100% Client-Side Web Crypto | ✅ Yes | ✅ Yes | ❌ Native Only | ❌ Mac Only | ✅ Yes |
| Model Context Protocol (MCP) | ✅ Grade A Server | ❌ No | ❌ No | ❌ Proprietary | ❌ No |
| Terminal CLI (npx castov) | ✅ Built-in | ❌ No | ❌ Separate | ❌ Mac GUI | ❌ No |
| Zero Server Payload Logging | ✅ Air-Gap Safe | ✅ Yes | ✅ Yes | ⚠️ Telemetry | ✅ Yes |
| Cross-Platform (Web/OS/Docker)| ✅ Universal | ⚠️ Web Only | ⚠️ Desktop Only | ❌ macOS Only | ⚠️ Web Only |
| AI Editor Integration (Cursor/Claude) | ✅ Native | ❌ No | ❌ No | ❌ No | ❌ No |
| Process / Port Killer (EADDRINUSE) | ✅ Built-in | ❌ No | ❌ No | ⚠️ Extension | ❌ No |
| Secret & API Key Leak Scanner | ✅ Built-in | ❌ No | ❌ No | ❌ No | ❌ No |
| Open Source (MIT) | ✅ Yes | ✅ Apache 2.0 | ✅ MIT | ❌ Proprietary | ✅ GPL-3.0 |
## 🤖 AI Agent Setup (Model Context Protocol - MCP)
Castov ships with a built-in, production-grade JSON-RPC 2.0 stdio MCP server supporting both Content-Length framed and ndjson stream protocols.
### 1. Claude Desktop
Add Castov to your claudedesktopconfig.json:
macOS: ~/Library/Application Support/Claude/claudedesktopconfig.json
Windows: %APPDATA%\Claude\claudedesktopconfig.json
Linux: ~/.config/Claude/claudedesktopconfig.json
json
"mcpServers": {
"castov": {
"command": "npx",
"args": ["-y", "castov", "mcp"]
### 2. Cursor IDE & Windsurf
Go to Settings → Features → MCP Servers → Add New MCP Server:
Name: castov
Type: command
Command: npx -y castov mcp
Alternatively, add to your project's .cursor/mcp.json:
json
"mcpServers": {
"castov": {
"command": "npx",
"args": ["-y", "castov", "mcp"]
### Native Tools Exposed to Agents (10 Tools — All 100% Local & Read-Only)
| MCP Tool | Capability | Example Agent Prompt |
| castovport | Identifies listening services, protocol mappings, and inspects process collision | "Why is port 3000 busy and what service uses it?" |
| castovcidr | Calculates IPv4 subnet masks, wildcard, broadcast, and usable host count | "Calculate usable IP range and subnet mask for 10.240.0.0/22" |
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- Source
- awesome · https://github.com/castovdev/castov
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SECURITY.mdat the repository root (which does not mean it is unsafe)
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