Model-agnostic agent harness for Elixir

Alloy

Minimal, OTP-native agent loop for Elixir.

Alloy is the completion-tool-call loop and nothing else. Send messages to any LLM, execute tool calls, loop until done. Swap providers with one line. Run agents as supervised GenServers. No opinions on sessions, persistence, memory, scheduling, or UI — those belong in your application.

{:ok, result} = Alloy.run("Read mix.exs and tell me the version",
  provider: {Alloy.Provider.OpenAI, api_key: System.get_env("OPENAI_API_KEY"), model: "gpt-5.4"},
  tools: [Alloy.Tool.Core.Read]
)

result.text #=> "The version is 0.10.0"

Why Alloy?

Most agent frameworks try to be everything — sessions, memory, RAG, multi-agent orchestration, scheduling, UI. Alloy does one thing well: the agent loop. Inspired by Pi Agent's minimalism, Alloy brings the same philosophy to the BEAM with OTP's natural advantages: supervision, fault isolation, parallel tool execution, and real concurrency.

• 6 providers — Anthropic, DeepSeek, OpenAI, Codex, xAI, and OpenAICompat (works with any OpenAI-compatible API: Ollama, OpenRouter, DeepSeek, Mistral, Groq, Together, etc.)
• 4 built-in tools — read, write, edit, bash
• GenServer agents — supervised, stateful, message-passing
• Streaming — token-by-token from any provider, unified interface
• Async dispatch — send_message/2 fires non-blocking, result arrives via PubSub
• Middleware — custom hooks, tool blocking, argument editing
• Context compaction — summary-based compaction when approaching token limits, with configurable reserve and fallback t