SKILL.md
JaxLife Open-Ended
Trit: +1 (PLUS - generator) Color: Red (#D82626)
Overview
Implements patterns from JaxLife and related open-ended ALife simulators:
- Embodied agents with neural network controllers
- Turing-complete programmable environments
- Emergent communication, agriculture, and tool use
- Open-ended cultural and technological accumulation
Key Papers
- JaxLife: An Open-Ended Agentic Simulator - Lu et al. 2024
- Biomaker CA - Randazzo & Mordvintsev 2023
- LifeGPT - Berkovich & Buehler 2024
- The Station - Chung & Du 2025
- Static Sandboxes Are Inadequate - Chen et al. 2025
Core Concepts
JaxLife Environment
┌─────────────────────────────────────────────────────┐
│ JAXLIFE WORLD │
├─────────────────────────────────────────────────────┤
│ ┌─────────┐ ┌─────────┐ ┌─────────┐ │
│ │ Agent 1 │ │ Agent 2 │ │ Agent N │ ... │
│ │ (NN) │ │ (NN) │ │ (NN) │ │
│ └────┬────┘ └────┬────┘ └────┬────┘ │
│ │ │ │ │
│ ▼ ▼ ▼ │
│ ┌─────────────────────────────────────────────┐ │
│ │ PROGRAMMABLE GRID │ │
│ │ (Turing-complete, supports computation) │ │
│ └─────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌─────────────────────────────────────────────┐ │
│ │ EMERGENT BEHAVIORS │ │
│ │ • Communication protocols │ │
│ │ • Agriculture / resource management │ │
│ │ • Tool use and construction │ │
│ │ • Cultural inheritance │ │
│ └─────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────┘Agent Architecture
\text{Agent state: } s_t = (position, energy, memory, genome)
\text{Observation: } o_t = \text{local\_view}(world, position, vision\_range)
\text{Action: } a_t = \pi_\theta(o_t, memory_t)
\text{Actions include: move, eat, reproduce, communicate, interact}Programmable World
The world supports Turing-complete computation:
- Cells can hold "programs" (like assembly instructions)
- Agents can read/write/execute cell contents
- Enables tool creation and cultural artifacts
API
JAX Implementation
import jax
import jax.numpy as jnp
from flax import linen as nn
from typing import Tuple, Dict
@dataclass
class AgentState:
position: jnp.ndarray # (2,)
energy: float
memory: jnp.ndarray # (memory_size,)
genome: jnp.ndarray # (genome_size,)
age: int
class AgentBrain(nn.Module):
"""Neural network controller for JaxLife agent."""
hidden_dim: int = 64
memory_dim: int = 32
num_actions: int = 8
@nn.compact
def __call__(self, observation: jnp.ndarray, memory: jnp.ndarray):
# Combine observation and memory
x = jnp.concatenate([observation.flatten(), memory])
# Process through network
x = nn.Dense(self.hidden_dim)(x)
x = nn.relu(x)
x = nn.Dense(self.hidden_dim)(x)
x = nn.relu(x)
# Output: action logits + new memory
action_logits = nn.Dense(self.num_actions)(x)
new_memory = nn.Dense(self.memory_dim)(x)
new_memory = nn.tanh(new_memory)
return action_logits, new_memory
class JaxLifeWorld:
"""JaxLife open-ended world simulation."""
def __init__(
self,
world_size: Tuple[int, int] = (64, 64),
num_agents: int = 100,
cell_channels: int = 16
):
self.world_size = world_size
self.num_agents = num_agents
self.cell_channels = cell_channels
def init_world(self, key: jax.random.PRNGKey) -> Dict:
"""Initialize world state."""
k1, k2, k3 = jax.random.split(key, 3)
# World grid (programmable cells)
grid = jax.random.uniform(
k1,
(*self.world_size, self.cell_channels)
)
# Resources (food, etc.)
resources = jax.random.uniform(k2, self.world_size)
# Initialize agents
agents = self.init_agents(k3)
return {
"grid": grid,
"resources": resources,
"agents": agents,
"step": 0
}
def init_agents(self, key: jax.random.PRNGKey) -> Dict:
"""Initialize agent population."""
keys = jax.random.split(key, self.num_agents)
positions = jax.random.randint(
keys[0],
(self.num_agents, 2),
0,
self.world_size[0]
)
energies = jnp.ones(self.num_agents) * 100.0
memories = jnp.zeros((self.num_agents, 32))
genomes = jax.random.normal(keys[1], (self.num_agents, 256))
return {
"positions": positions,
"energies": energies,
"memories": memories,
"genomes": genomes,
"ages": jnp.zeros(self.num_agents, dtype=jnp.int32)
}
@jax.jit
def step(self, state: Dict, agent_params: Dict) -> Dict:
"""Run one simulation step."""
# Get observations for all agents
observations = self.get_observations(state)
# Compute actions using agent brains
actions, new_memories = self.compute_actions(
observations,
state["agents"]["memories"],
agent_params
)
# Execute actions
state = self.execute_actions(state, actions)
# Update memories
state["agents"]["memories"] = new_memories
# Environment dynamics (resource regrowth, etc.)
state = self.environment_step(state)
# Reproduction and death
state = self.life_cycle(state)
state["step"] += 1
return state
def get_observations(self, state: Dict) -> jnp.ndarray:
"""Get local observations for all agents."""
vision_range = 5
obs = []
for i in range(self.num_agents):
pos = state["agents"]["positions"][i]
local = self.get_local_view(state, pos, vision_range)
obs.append(local)
return jnp.stack(obs)
def execute_actions(self, state: Dict, actions: jnp.ndarray) -> Dict:
"""Execute agent actions."""
# Action types: 0=stay, 1-4=move, 5=eat, 6=reproduce, 7=communicate
for i in range(self.num_agents):
action = actions[i]
if action in [1, 2, 3, 4]:
# Move
direction = [(0, 0), (0, 1), (0, -1), (1, 0), (-1, 0)][action]
new_pos = state["agents"]["positions"][i] + jnp.array(direction)
new_pos = jnp.clip(new_pos, 0, self.world_size[0] - 1)
state["agents"]["positions"] = state["agents"]["positions"].at[i].set(new_pos)
state["agents"]["energies"] = state["agents"]["energies"].at[i].add(-1)
elif action == 5:
# Eat
pos = tuple(state["agents"]["positions"][i])
food = state["resources"][pos]
state["agents"]["energies"] = state["agents"]["energies"].at[i].add(food * 10)
state["resources"] = state["resources"].at[pos].set(0)
elif action == 6:
# Reproduce (if enough energy)
if state["agents"]["energies"][i] > 50:
state = self.reproduce(state, i)
elif action == 7:
# Communicate (modify nearby grid cells)
pos = tuple(state["agents"]["positions"][i])
signal = state["agents"]["memories"][i, :self.cell_channels]
state["grid"] = state["grid"].at[pos].set(signal)
return state
def reproduce(self, state: Dict, parent_idx: int) -> Dict:
"""Agent reproduction with mutation."""
# Find dead agent slot or create new
dead_mask = state["agents"]["energies"] <= 0
if not dead_mask.any():
return state # No room for new agent
child_idx = jnp.argmax(dead_mask)
# Inherit genome with mutation
parent_genome = state["agents"]["genomes"][parent_idx]
mutation = jax.random.normal(jax.random.PRNGKey(state["step"]), parent_genome.shape) * 0.1
child_genome = parent_genome + mutation
# Set child state
state["agents"]["genomes"] = state["agents"]["genomes"].at[child_idx].set(child_genome)
state["agents"]["positions"] = state["agents"]["positions"].at[child_idx].set(
state["agents"]["positions"][parent_idx]
)
state["agents"]["energies"] = state["agents"]["energies"].at[child_idx].set(25)
state["agents"]["energies"] = state["agents"]["energies"].at[parent_idx].add(-25)
state["agents"]["ages"] = state["agents"]["ages"].at[child_idx].set(0)
return state
def run_simulation(num_steps: int = 10000):
"""Run JaxLife simulation."""
world = JaxLifeWorld(world_size=(64, 64), num_agents=100)
key = jax.random.PRNGKey(42)
k1, k2 = jax.random.split(key)
# Initialize
state = world.init_world(k1)
# Initialize agent brain parameters
brain = AgentBrain()
params = brain.init(k2, jnp.zeros((11 * 11 * 16,)), jnp.zeros(32))
# Run simulation
for step in range(num_steps):
state = world.step(state, params)
if step % 1000 == 0:
alive = (state["agents"]["energies"] > 0).sum()
avg_age = state["agents"]["ages"][state["agents"]["energies"] > 0].mean()
print(f"Step {step}: {alive} alive, avg age {avg_age:.1f}")
return stateMetrics for Open-Endedness
def measure_open_endedness(history: List[Dict]) -> Dict:
"""Measure open-endedness metrics."""
# Novelty: new behaviors over time
novelty = compute_novelty(history)
# Complexity: increasing agent complexity
complexity = compute_complexity(history)
# Learnability: can new things be learned
learnability = compute_learnability(history)
# Diversity: behavioral diversity
diversity = compute_diversity(history)
return {
"novelty": novelty,
"complexity": complexity,
"learnability": learnability,
"diversity": diversity,
"open_endedness": novelty * learnability # Product definition
}GF(3) Triads
This skill participates in balanced triads:
persistent-homology (-1) ⊗ self-evolving-agent (0) ⊗ jaxlife-open-ended (+1) = 0 ✓
temporal-coalgebra (-1) ⊗ chemical-computing-substrate (0) ⊗ jaxlife-open-ended (+1) = 0 ✓
sheaf-cohomology (-1) ⊗ open-games (0) ⊗ jaxlife-open-ended (+1) = 0 ✓Emergent Behaviors
From JaxLife paper:
- Communication Protocols: Agents develop signals for coordination
- Agriculture: Resource management and cultivation
- Tool Use: Creating and using environmental artifacts
- Cultural Inheritance: Knowledge transfer across generations
Integration with Music-Topos
;; In agents/jaxlife_bridge.clj
(defn jaxlife-color-ecology
"Simulate color agent ecology"
[initial-population]
(let [world (init-color-world 64 64)
agents (mapv #(make-color-agent %) initial-population)]
(loop [state {:world world :agents agents :step 0}]
(if (< (:step state) 10000)
(recur (step-color-ecology state))
(extract-emergent-patterns state)))))
;; Agents evolve color preferences through interaction
;; Emergent: color niches, color signaling, color cultureSee Also
self-evolving-agent- Self-improving agent patternsforward-forward-learning- Local learning for agent brainschemical-computing-substrate- Reaction networks for environmentbiomaker-morphogenesis- Morphogenetic CA patterns
References
@article{lu2024jaxlife,
title={JaxLife: An Open-Ended Agentic Simulator},
author={Lu, Chris and others},
journal={arXiv:2409.00853},
year={2024}
}
@article{randazzo2023biomaker,
title={Biomaker CA: a Biome Maker project using Cellular Automata},
author={Randazzo, Ettore and Mordvintsev, Alexander},
journal={arXiv:2307.09320},
year={2023}
}
@article{chung2025station,
title={The Station: An Open-World Environment for AI-Driven Discovery},
author={Chung, Stephen and Du, Wenyu},
journal={arXiv:2511.06309},
year={2025}
}ALife atlas
Part of: alife-commons. Family: open-ended-evolution. Canonical: alife.