Run Scenario

Run Scenario Skill

Execute a single SWARM scenario with a given seed and export all artifacts to a standardized output directory.

Prerequisites

• swarm-safety package installed (pip install swarm-safety or pip install -e /root/swarm-package/)
• Scenario YAML file available (typically in /root/scenarios/)

Procedure

1. Resolve the scenario path

Scenario references can be shorthand or full paths:

• baseline → scenarios/baseline.yaml
• scenarios/baseline.yaml → use as-is
• /root/scenarios/baseline.yaml → use as-is

import os

def resolve_scenario(ref: str) -> str:
    """Resolve a scenario reference to a full path."""
    candidates = [
        ref,
        f"scenarios/{ref}.yaml",
        f"/root/scenarios/{ref}.yaml",
        f"scenarios/{ref}",
    ]
    for c in candidates:
        if os.path.isfile(c):
            return c
    raise FileNotFoundError(f"Cannot find scenario: {ref}")

2. Run the simulation

Use the SWARM CLI to execute:

python -m swarm run <scenario_path> --seed <seed> --epochs <N> --steps <M>

Or programmatically:

from swarm.core.orchestrator import Orchestrator
from swarm.scenarios.loader import load_scenario

config = load_scenario(scenario_path)
# Override simulation parameters if needed
config["simulation"]["seed"] = seed
config["simulation"]["n_epochs"] = epochs
config["simulation"]["steps_per_epoch"] = steps

orch = Orchestrator(config)
result = orch.run()

3. Export artifacts

After the run completes, export to the output directory:

import json
import os

os.makedirs(output_dir, exist_ok=True)

# Export history.json
with open(os.path.join(output_dir, "history.json"), "w") as f:
    json.dump(result.to_dict(), f, indent=2)

# Export CSV metrics
csv_dir = os.path.join(output_dir, "csv")
os.makedirs(csv_dir, exist_ok=True)
result.export_csv(csv_dir)

4. Extract key metrics

The final epoch snapshot contains summary metrics:

history = result.to_dict()
final = history["epoch_snapshots"][-1]
welfare = final["welfare"]
toxicity = final["toxicity_rate"]
print(f"Final welfare: {welfare:.3f}")
print(f"Final toxicity: {toxicity:.3f}")

Output Structure

<output_dir>/
├── history.json          # Full simulation history
└── csv/
    ├── epoch_metrics.csv # Per-epoch aggregate metrics
    └── agent_metrics.csv # Per-agent per-epoch metrics

Common Issues

• ImportError: Ensure swarm-safety is installed with runtime deps: pip install swarm-safety[runtime]
• FileNotFoundError for scenario: Check /root/scenarios/ for available YAMLs
• Reproducibility: Same seed + same scenario YAML = identical results