Blitzdenk

Universal Coding harness for posix. No deps, no chain, vendored Lua. Extend in Lua with hot reload. Let the harness code itself.

Core features and patterns

• All IO goes through GNU core utils (ls, tee, cat, etc.)
• Optional SSH layer: Execute remote.
• MCP and Skill support.
• Multi-provider: Any OpenAI or Anthropic chat/response schema supported, including local AI.
• Mermaid diagram render in tui.
• Lua hot reload. Agents can code tools and debug them at the same time.

Install

You can download the pre compiled binaries from the release page or build it yourself:

zig build --release=small
cp zig-out/bin/blitz ~/.local/bin/blitz

Minimal configuration

Open the blitz.lua configuration at ~/.config/blitzdenk/blitz.lua Setup at least on provider. The key_envar is not the API key! It's the environment var holding your key.

local anthropic = blitz.add_provider({
	type = "anthropic",
	url = "https://api.anthropic.com/v1/",
	key_envar = "CLAUDE_API_KEY",
	max_tokens = 32000,
	temperature = 1,
})

local llama = blitz.add_provider({
	type = "openai",
	url = "http://127.0.0.1:8118",
	key_envar = "",
	max_tokens = 32000,
})

local novita = blitz.add_provider({
	type = "openai",
	url = "https://api.novita.ai/openai/v1",
	key_envar = "NOVITA_API_KEY",
	temperature = 1,
	max_tokens = 32000,
})

local openrouter = blitz.add_provider({
	type = "openai",
	url = "https://openrouter.ai/api/v1",
	key_envar = "OPENROUTER_API_KEY",
	temperature = 1,
	max_tokens = 32000,
})

local xai = blitz.add_provider({
	type = "response",
	url = "https://api.x.ai/v1",
	key_envar = "XAI_API_KEY",
	temperature = 1,
	max_tokens = 32000,
})

local openai = blitz.add_provider({
	type = "response",
	url = "https://api.openai.com/v1",
	key_envar = "OPENAI_API_KEY",
	max_tokens = 32000,
})

Then set a default model to use, or specify which agent should use which model

blitz.set_model("gpt-5.4-mini", openai)
blitz.set_model_agent(blitz.AGENT_GENERAL, "deepseek/deepseek-v4-pro", "max", novita)

Documentation

Ask the agent, once the provider is set up. The blitzdenk-lua.md skill contains all information required. or take a look at my configuration.

Contribution

No issue no merge. Open source, restricted contribution. Simple bug fixes are welcome.