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The 182 the cap is chosen against had no direct case: the existing tests cover the root chain and the TypedDict field, both of which start one bracket lower. An array-rooted parameters schema reaches it from a plain ToolSdkSchema literal, no raw register() needed. Exactly 180 arrays over a const scalar is the worst case itself -- the root frame starts at listDepth 0, so every list[ still emits and the innermost Literal[ is reached rather than degraded; one deeper is where the item degrades. Name the subscript tool-name comment in pyScalar's docstring: it quotes through the same JSON.stringify call and inherits the same escapes and the same pass-throughs.
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.