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Nix Installation

The recommended way to run GenSparx with Nix is via nix-GenSparx — a batteries-included Home Manager module.

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Quick Start

Paste this to your AI agent (Claude, Cursor, etc.): 
I want to set up nix-GenSparx on my Mac.
Repository: github:GenSparx/nix-GenSparx

What I need you to do:
1. Check if Determinate Nix is installed (if not, install it)
2. Create a local flake at ~/code/GenSparx-local using templates/agent-first/flake.nix
3. Help me create a Telegram bot (@BotFather) and get my chat ID (@userinfobot)
4. Set up secrets (bot token, Anthropic key) - plain files at ~/.secrets/ is fine
5. Fill in the template placeholders and run home-manager switch
6. Verify: launchd running, bot responds to messages

Reference the nix-GenSparx README for module options.
📦 Full guide: github.com/GenSparx/nix-GenSparx The nix-GenSparx repo is the source of truth for Nix installation. This page is just a quick overview.

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What you get

  • Gateway + macOS app + tools (whisper, spotify, cameras) — all pinned
  • Launchd service that survives reboots
  • Plugin system with declarative config
  • Instant rollback: home-manager switch --rollback

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Nix Mode Runtime Behavior

When OPENCLAW_NIX_MODE=1 is set (automatic with nix-GenSparx): GenSparx supports a Nix mode that makes configuration deterministic and disables auto-install flows. Enable it by exporting: 
OPENCLAW_NIX_MODE=1
On macOS, the GUI app does not automatically inherit shell env vars. You can also enable Nix mode via defaults: 
defaults write bot.molt.mac GenSparx.nixMode -bool true

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Config + state paths

GenSparx reads JSON5 config from OPENCLAW_CONFIG_PATH and stores mutable data in OPENCLAW_STATE_DIR.
  • OPENCLAW_STATE_DIR (default: ~/.openclaw)
  • OPENCLAW_CONFIG_PATH (default: $OPENCLAW_STATE_DIR/openclaw.json)
When running under Nix, set these explicitly to Nix-managed locations so runtime state and config stay out of the immutable store.

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Runtime behavior in Nix mode

  • Auto-install and self-mutation flows are disabled
  • Missing dependencies surface Nix-specific remediation messages
  • UI surfaces a read-only Nix mode banner when present

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Packaging note (macOS)

The macOS packaging flow expects a stable Info.plist template at: 
apps/macos/Sources/GenSparx/Resources/Info.plist
scripts/package-mac-app.sh copies this template into the app bundle and patches dynamic fields (bundle ID, version/build, Git SHA, Sparkle keys). This keeps the plist deterministic for SwiftPM packaging and Nix builds (which do not rely on a full Xcode toolchain).