1000 Monkeys

What it demonstrates

swrm fan-out: all five agents run concurrently

on_failure: continue — the swrm proceeds even if an individual agent fails

Synthesis referencing each agent’s output via {{ generate.agents.<id>.output }}

Output variance as a feature, not a bug

Mixing OpenAI and Anthropic within a single swrm node

sirenspec run docs/cookbook/1000-monkeys/workflow.yaml # Try a different prompt: sirenspec run docs/cookbook/1000-monkeys/workflow.yaml \ --input "Write a one-sentence product tagline for a note-taking app."

Workflow

docs/cookbook/1000-monkeys/workflow.yaml

version: "0.1"

nodes:
  generate:
    type: swrm
    concurrency: 5
    on_failure: continue
    agents:
      - id: monkey_1
        provider: openai
        model: gpt-4o-mini
        prompt: "{{ inputs.message }}"
      - id: monkey_2
        provider: openai
        model: gpt-4o-mini
        prompt: "{{ inputs.message }}"
      - id: monkey_3
        provider: anthropic
        model: claude-haiku-4-5-20251001
        prompt: "{{ inputs.message }}"
      - id: monkey_4
        provider: anthropic
        model: claude-haiku-4-5-20251001
        prompt: "{{ inputs.message }}"
      - id: monkey_5
        provider: openai
        model: gpt-4o-mini
        prompt: "{{ inputs.message }}"

    synthesis:
      provider: anthropic
      model: claude-haiku-4-5-20251001
      prompt: |
        Select the single best candidate response to: {{ inputs.message }}
        Candidates: [1] {{ generate.agents.monkey_1.output }}
                    [2] {{ generate.agents.monkey_2.output }}
                    [3] {{ generate.agents.monkey_3.output }}
                    [4] {{ generate.agents.monkey_4.output }}
                    [5] {{ generate.agents.monkey_5.output }}
        Return the winning response verbatim. No explanation.

Parallel specialists, each with a different task.

Basics

Multi-Agent Patterns

Swrm & Fan-Out

Factory & Iteration

Guardrails

Human in the Loop

Budget & Cost Control

Stress Tests

Tool Nodes

What it demonstrates

Run it

Workflow

Graph

Next steps

Market Analysis

Swrm Reference

​What it demonstrates

​Run it

​Workflow

​Graph

​Next steps

Market Analysis

Swrm Reference

What it demonstrates

Run it

Workflow

Graph

Next steps