Four non-blocking review suggestions, all prose plus one assertion. `UNPRINTABLE`'s new sentence named three characters but only two raw-reach points, leaving "and NEL?" open; it now says all three reach text through `pyScalar`, and how the description path handles each. `pyScalar`'s raw-pass-through list already covered NEL under "the C1 controls", and the test now pins it alongside LS and PS, so the docstring's claim has a mechanical check for every character it names. The test title said "paragraph separators" for a pair whose first member is LINE SEPARATOR. Two docstring paragraphs are reflowed to the file's ~80 columns after the earlier inserts left short lines. The note's CPython-floor obligation gains a second axis: the `typing` names the block spells (`TypedDict` 3.8, `NotRequired` 3.11, `A | B` annotations 3.10) are definition-time evaluation floors, not parse floors, so the floor PR does not read "parseable on the supported range" as "executable on it".
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.