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utensils/mcp-nixos

v2.4.3 Feature

This release adds 3 notable features for engineering teams evaluating rollout.

Published 1mo MCP Developer Tools
✓ No known CVEs patched
Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

ai-assistant ai-integration ai-tools anthropic claude developer-tools
+13 more
devops-tools fastmcp llm-tools mcp model-context-protocol nix nix-options nix-packages nix-search nixos package-search python sre-tools

Summary

AI summary

Added server-level instructions string to improve LLM discoverability of the MCP-NixOS server.

Full changelog

MCP-NixOS v2.4.3 improves LLM discoverability of the server with a server-level instructions string, an INTENTS → CALLS recipe block in the nix tool, deterministic action=info matching that no longer silently substitutes packages with shared pnames, and per-channel nixpkgs HEAD revisions in action=channels.

Closes #146. Drop-in replacement for v2.4.2 — no configuration or API changes.

Highlights

  • Server-level instructions surfaced via the MCP InitializeResult so hosts prime the model on when to reach for this server vs. Bash / web search.
  • action=info now matches by exact attribute path first, then exact pname, with explicit JSON-shaped disambiguation hints when multiple attrs share a pname (firefox / firefox-esr / firefox-mobile).
  • action=channels now surfaces a Revision (indexed) for unstable channels (exact build commit) and a Branch HEAD (best-effort, 10-min TTL) for release channels — clearly distinguished so callers know which one to compare against nix_versions.
  • 12 new unit tests; 348 total (was 336).

See RELEASE_NOTES.md for the full breakdown.

Install

pip install mcp-nixos==2.4.3
nix run github:utensils/mcp-nixos
docker pull ghcr.io/utensils/mcp-nixos:2.4.3
View diff on GitHub

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About utensils/mcp-nixos

MCP server providing accurate information about NixOS packages, system options, Home Manager configurations, and nix-darwin macOS settings to prevent AI hallucinations.

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Related context

Beta — feedback welcome: [email protected]