modular-agent-designer 0.6.5

A modular framework for designing and orchestrating complex agentic workflows with ease.

Modular Agent Designer

Declarative YAML → Google ADK workflow compiler. Define agents, tools, models, and graph topology in a single YAML file — no Python code required.

pip install modular-agent-designer

Note: google-adk is currently in beta — install with --prerelease=allow when using uv.

---

Quickstart

# Scaffold a new agent project
uv run modular-agent-designer create my_agent

# Run it
uv run modular-agent-designer run my_agent/my_agent.yaml --input '{"message": "hello"}'

---

What a workflow looks like

name: research_assistant

models:
  sonnet:
    provider: anthropic
    model: anthropic/claude-sonnet-4-6

tools:
  web:
    type: builtin
    name: fetch_url

agents:
  researcher:
    model: sonnet
    tools: [web]
    instruction: "Research {{state.topic}} and summarize your findings."

  writer:
    model: sonnet
    instruction: "Write a short article based on: {{state.researcher}}"

workflow:
  nodes: [researcher, writer]
  edges:
    - from: researcher
      to: writer

uv run modular-agent-designer run research.yaml --input '{"topic": "quantum computing"}'

---

Key features

Feature	Details
Multi-provider models	Anthropic, Google Gemini, OpenAI, Ollama — all via LiteLLM
Tools	Builtin callables, arbitrary Python functions, MCP servers (stdio / SSE / HTTP)
Routing	Conditional edges, default fallback, self-loops, parallel fan-out with join barriers
State templating	{{state.key}} in prompts resolved at runtime
Structured output	Per-agent Pydantic output_schema
Thinking/reasoning	Anthropic extended-thinking, OpenAI reasoning effort, Gemini thinking budget
Retries	Per-agent fixed or exponential backoff
Observability	Optional MLflow / OTLP tracing via --mlflow
Escape hatch	Drop in custom BaseNode subclasses for non-LLM logic

---

Supported model providers

model: anthropic/claude-sonnet-4-6    # Anthropic — ANTHROPIC_API_KEY
model: gemini/gemini-2.5-pro          # Google    — GOOGLE_API_KEY
model: openai/gpt-4o                  # OpenAI    — OPENAI_API_KEY
model: ollama_chat/gemma3             # Ollama    — OLLAMA_API_BASE (default: localhost:11434)

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Links

• GitHub
• Full YAML reference & docs