{
  "id": "layer:4-agent-core",
  "_kind": "Layer",
  "_file": "stack-layers/layers/layer-4-agent-core.yaml",
  "_cluster": "stack-layers",
  "attributes": {
    "displayName": "Agent-Core",
    "position": 4,
    "path": "compute",
    "scope": "Inner loop and graph/turn semantics for one agent brain.",
    "summary": "The agent-core layer drives an inference turn or graph step end-to-end:\nprompt/context assembly, state transition, tool dispatch, child-agent\nhandoff, message materialization, result synthesis, and stop detection.\nRealized by `AgentCoreImpl` instances.\n",
    "responsibilities": [
      "Define loop, graph, or state-machine iteration semantics.",
      "Assemble prompt/context and normalize message/state materialization.",
      "Dispatch tools/subagents and synthesize terminal results.",
      "Detect stops, interrupts, graph terminal states, and budget exits."
    ],
    "examples": [
      "LangGraph StateGraph, graph nodes/edges/state, create_agent routing.",
      "Claude Code/Codex/Gemini CLI loop cores.",
      "a5c unified core and Pi-compatible tool-use loop profiles.",
      "Tool dispatch, stop detection, context-window handling, result envelopes."
    ],
    "fitNotes": "This is where custom agent builders fit first. A product may expose only a\ncore library without owning runtime, platform, workspace, or presentation.\na5c's core is modeled as a unified same-layer contract, not as built on top\nof Pi; Pi is a compatibility profile.\n"
  },
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