`simvx.core.ai.agent_node`¶

Frame-loop driver that ticks any :class:Brain from a node’s on_update.

This is the dependency-free half of the AI driving layer: it ticks any core Brain (a hand-rolled behaviour tree, state machine, utility scorer, or the LLM brain in simvx.ai) and never imports simvx.ai or httpx. Classical brains are first-class here with zero LLM dependency.

Three primitives, smallest to largest:

func:

build_ai_context - the free helper that snapshots a node + tree into an :class:AIContext for one tick.
class:

BrainRunner - owns brain + blackboard + tick_interval; its

meth:

BrainRunner.step ticks at a cadence, passing the elapsed since the last tick (an accumulator), not the raw frame dt, so brains see correct deltas regardless of tick rate. Usable from any existing Node subclass.
class:

AgentNode - the canonical batteries-included node that builds a Blackboard in on_ready, calls runner.step in on_update, and tears the brain down in on_exit_tree.

The driver calls exactly one method per tick: brain.tick(ctx). It never calls perceive / decide / act directly.

Module Contents¶

Classes¶

`BrainRunner`	Drive a :class:`Brain` at a fixed cadence from any node’s per-frame update.
`AgentNode`	A node that drives one :class:`Brain` every frame (or at `tick_interval`).

Functions¶

build_ai_context

Snapshot a live in-tree node into an :class:AIContext for one tick.

API¶

simvx.core.ai.agent_node.build_ai_context(node: simvx.core.node.Node, dt: float, blackboard: simvx.core.ai.blackboard.Blackboard) → simvx.core.ai.brain.AIContext[source]¶

Snapshot a live in-tree node into an :class:AIContext for one tick.

agent is the node, world is its :class:SceneTree, and now is the tree’s accumulated sim clock. Must be called while the node is in the tree (node.tree is None before on_enter_tree); that is a programming error, raised eagerly rather than silently feeding the brain now=0.

class simvx.core.ai.agent_node.BrainRunner(brain: simvx.core.ai.brain.Brain, blackboard: simvx.core.ai.blackboard.Blackboard, *, tick_interval: float = 0.0)[source]¶

Drive a :class:Brain at a fixed cadence from any node’s per-frame update.

tick_interval == 0 ticks every frame (the classical authoritative cadence). tick_interval > 0 ticks every tick_interval seconds, and the dt the brain sees is the time elapsed since the previous tick (the accumulator), not the raw frame dt.

Initialization

step(node: simvx.core.node.Node, dt: float) → None[source]¶: Advance the cadence by dt and tick the brain if it is due.

class simvx.core.ai.agent_node.AgentNode(*, brain: simvx.core.ai.brain.Brain | None = None, squad: simvx.core.ai.blackboard.Blackboard | None = None, **kwargs: Any)[source]¶

Bases: simvx.core.node.Node

A node that drives one :class:Brain every frame (or at tick_interval).

Set self.brain (in __init__ or before the node enters the tree). The node builds its :class:Blackboard in on_ready (optionally a child() of a squad board), creates a :class:BrainRunner, ticks it in on_update, and tears the brain down in on_exit_tree. With self.brain = None it is an inert node, so subclasses can set the brain conditionally.