Show HN: Castov – Open-source dev tools and AI secret shield with zero telemetry

Category: devtools

Tags: mcp, developer-tools, privacy, cli, security

Score: 5.8/10 (Innovation: 5, Technical: 6, Documentation: 7, Utility: 5)

Castov is a privacy-first developer utility suite distributed as a CLI, Docker image, VS Code extension, and 61 client-side browser tools, plus an MCP server exposing deterministic offline tools (CIDR math, timestamp/ID decoding, JWT decode, secret scanning, port inspection) to AI agents like Claude Desktop and Cursor. Its interesting angle is packaging these deterministic helpers as an MCP execution layer to reduce LLM hallucination on exact operations while keeping all data local with zero telemetry.

Target audience: backend devs, devops, and AI-assisted developers using MCP-enabled editors

Repository: https://castov.com · TypeScript · MIT · 1 stars

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