Normandy

Build production-ready AI agents in Elixir — structured schemas, tool calling, multi-agent coordination, streaming, and distributed sessions, with first-class Anthropic Claude support.

Normandy is an Elixir framework for building reliable LLM agents on the BEAM. It gives you type-safe input/output schemas with automatic JSON Schema generation, tool/function calling, conversational memory, and OTP-native primitives for multi-agent coordination and distributed, fault-tolerant sessions. It ships with a built-in adapter for Anthropic Claude and a clean protocol for any other LLM provider.

Features

🧠 Agent system — conversational agents with memory, state, and turn-based history.
📋 Schema DSL — typed, validated structs with JSON Schema generation (nested schemas, anyOf/oneOf/allOf, conditional if/then/else, virtual fields, introspection).
🔧 Tool calling — LLM tool/function calling with automatic execution loops.
🤝 Multi-agent coordination — reactive patterns (race/all/some), agent pools, and supervised agent processes.
🌐 Distributed sessions — single-node to multi-node, fault-tolerant sessions across Tiers 0/1/2 (in-memory/ETS, Postgres, Mnesia, Redis) with eager resume on node loss.
🛡️ Guardrails — input/output admission control with fail-open/closed policies and semantic scope checks.
🌊 Streaming — real-time response streaming with callback-based event processing.
💰 Prompt caching — up to 90% cost reduction via automatic Anthropic prompt caching.
🔄 Resilience — built-in retry (exponential backoff + jitter) and circuit breaker patterns.
📦 Batch processing — concurrent processing of many inputs with progress tracking.
📏 Context management — token counting, automatic truncation, and LLM-based summarization.
🔌 Protocol support — interoperate via Model Context Protocol (MCP) and Agent-to-Agent (A2A).
📊 Observability — Telemetry events, structured lifecycle logging, and OpenTelemetry-compatible spans.
🎯 Type safety — comprehensive type system with Dialyzer support, backed by 900+ tests including property-based testing.

Installation

Add normandy to your dependencies in mix.exs:

def deps do
  [
    {:normandy, "~> 1.0"}
  ]
end

Then fetch dependencies:

mix deps.get

Quick Start

Define structured data, then run an agent against Anthropic Claude:

# 1. Configure an LLM client (built-in Anthropic Claude adapter)
client = %Normandy.LLM.ClaudioAdapter{
  api_key: System.get_env("ANTHROPIC_API_KEY"),
  options: %{enable_caching: true}
}

# 2. Initialize an agent
agent =
  Normandy.Agents.BaseAgent.init(%{
    client: client,
    model: "claude-sonnet-4-6",
    temperature: 0.7
  })

# 3. Run a turn
{agent, response} =
  Normandy.Agents.BaseAgent.run(agent, %{
    chat_message: "Explain Elixir's actor model in one sentence."
  })

Defining a typed schema is just as direct:

defmodule User do
  use Normandy.Schema

  io_schema "User profile" do
    field(:name, :string, description: "Full name", required: true)
    field(:age, :integer, description: "Age", minimum: 0, maximum: 150)
  end
end

# Export as JSON Schema for LLM prompts / structured output
schema = User.get_json_schema()

Bring your own LLM by implementing the Normandy.Agents.Model protocol — Claude is supported out of the box, but nothing is hard-wired to it.

Documentation

Full API reference and guides are published on HexDocs:

📚 API documentation — every module, grouped by Core, Agents, DSL, Coordination, Tools, Context Management, Resilience, Guardrails, MCP, A2A, and LLM Adapters.
🌐 Distributed sessions guide — Tiers 0/1/2, durable stores, and multi-node setup.
📝 CHANGELOG — release notes and migration guidance.
🗺️ ROADMAP — phased development history and direction.

Generate the docs locally with mix docs and open doc/index.html.

Development

mix test            # run the default suite (integration tests skipped)
mix test --cover    # run with coverage
mix dialyzer        # static type analysis
mix format          # format code

Run the live-API integration suite with an Anthropic key:

export ANTHROPIC_API_KEY="your-api-key"
mix test --include integration --include normandy_integration

Contributing

Contributions are welcome — please open an issue or submit a pull request.

License

Released under the MIT License.

Acknowledgments

The schema system is inspired by Ecto's approach to data definition, validation, and changesets.

Made with Elixir 💜

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