core/

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The session log, system-prompt assembly, tool registry, agent vocabulary, deployment-default model selection, and concrete loop that form the harness's default control spine. These are product packages — the stable surface plugins and consumers build against.

Package	Role	ctx key
scope/	Scoped-context registration primitive	library — no ctx key
session/	Event-sourced session log and in-memory store	ctx.sessions
system-prompt/	Prompt and tool-schema assembly registry	ctx.systemPrompt
tools/	Scoped tool registry and execution pipeline	ctx.tools
agent/	Agent interface, registry, and event vocabulary	ctx.agents
agent-default-model/	Default model selection shared by Agent entry points	ctx.agentDefaultModel
agent-loop/	Default concrete agent driver	ctx.agentLoop

scope supplies the shared scoping primitive. agent owns the public contract, while agent-loop is its default implementation; extension plugins depend on the seam so the driver remains swappable. agent-default-model owns the deployment selection an Agent entry point uses only when a session has no selection of its own.

Runnable compositions belong to examples/agent-spine-demo; this group owns only the swappable spine pieces.

The subsystem reference — the package-by-package loop map, the Agent handle and its delivery/interception contracts — is docs/subsystems/core.md; the default runnable composition is examples/agent-spine-demo.