Purge the residual task/phase ordinals review caught ((T2), (queue cut 1) ×3, T6, P-I, 'this cut' ×6 including battery-expansion finds in two untouched notes and a workflow JSDoc); drop the 'externally logged as Decision 21' parenthetical and rename the remaining bare decision-21 mentions; mark the gui-layering IPC bridge row as a hypothetical example; restore the GATE_NOTICE doc-typecheck clause and the py-types 'measured' provenance; say subprocess-backed in filesystem.md; add the picker note path. Amend the citations note: merged-PR evidence anchors in Agent Notes are sanctioned, and the candidate gate patterns gain the four shapes the sweep missed. All nine touched pairs re-recorded.
core/ — product API spine
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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 front doors | 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 front door 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.