Review read `JSON.stringify`'s raw pass-through of U+0085/U+2028/U+2029 as a parse hazard: an LS in a `Literal[...]` value or in a `# tools["..."]` comment would end the physical line and take the SDK block down. Measured on CPython 3.9.6 (Unicode 13.0) and 3.12.13 (15.0): all three are accepted in both a string literal and a `#` comment, value round-tripping, and only LF and CR terminate either. The set is the tokenizer's, not `str.splitlines()`'. Both existing claims were accurate, so nothing changes behaviorally. Name the distinction where it was assumed: `UNPRINTABLE`'s terminator sentence now says which set it means, and `pyScalar`'s raw-pass-through list, previously "DEL and the C1 controls", now also names LS/PS, which are neither. A test pins the raw form for `const` and `enum` so escaping them later cannot land as a silent divergence from the TypeScript flavor.
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.