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7233d40fc9
Moving `web-agent-presets` to the built lane took its coverage with it, and the per-file gate named what it had been the only reach for: the session header's `agentPreset` type check, and the preset subtree's `write()` override. Neither belonged to a real-composition boot — a header validation case and a subtree behaviour are package-level facts. The `write()` test states why the override exists: the inherited method persists the tree whenever the Loader thinks the config moved, and disposing an agent disposes its subtree, so inheriting it truncates the shipped preset to `[]` the first time a session ends.
core/ — product API spine
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The session log, system-prompt assembly, tool registry, agent vocabulary, 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-loop/ |
Default concrete agent driver | ctx.agentLoop |
scope supplies the shared scoping primitive. agent owns the public seam, while agent-loop is its default implementation; extension plugins depend on the seam so the driver remains swappable.
Runnable compositions belong to examples/agent-spine-demo; this group owns only the swappable spine pieces.