Tianyi Cui
abe80cec68
Address review on the interception-seams PR: PromptDecision.reason is documented as the durable record of why a prompt was blocked, but the loop only surfaced it via the fully-blocked batch's `rejected` turn/end. In a MIXED batch — one queued prompt blocked, another allowed — the turn does not end `rejected`, so the blocked prompt and its reason vanished from the session log entirely. Add a `prompt/blocked` SessionEventMap variant (content + source + reason), appended in the open turn at the veto point in place of the user/message the prompt would have become. It is a non-surface, turn-enclosed event (like todo/write): it never reaches deriveMessages(). The fully-blocked batch still also ends `rejected` for boundary balance + ACP settlement. Regression test drives a mixed batch and asserts the blocked prompt is recorded while the allowed one runs — proven red without the append.
core/ — product API spine
The packages every harness build is assembled from: the session log, the system-prompt assembly, the tool registry, the agent vocabulary, and the one concrete loop that drives them. These are product packages — the stable surface plugins and consumers build against.
| Package | Role | ctx key |
|---|---|---|
session/ |
Event-sourced session log + in-memory store | ctx.sessions |
system-prompt/ |
Prompt-section + tool-schema assembly registry | ctx.systemPrompt |
tools/ |
Tool registry + tools/pre-execute/tools/post-execute pipeline |
ctx.tools |
agent/ |
Agent interface, registry, agent/* event vocabulary |
ctx.agents |
agent-loop/ |
The concrete loop plugin: ReactLoopAgent + the loop driver |
ctx.agentLoop |
agent-core/ |
Bundle plugin: the providerless/executor-less/UI-less spine as code | (loads the spine) |
agent-loop is the one concrete implementation of the agent seam and lives here because it is the harness's default product loop; everything else in core/ is interface/vocabulary. Plugins depend on the agent vocabulary, never on agent-loop directly, so the loop stays swappable.
agent-core is the composition counterpart: one bundle plugin that loads the whole providerless spine (timer + llm + sessions + system-prompt + tools + agents + invariants + tool-bash + agent-loop) and forwards agent-loop's agents list as its own config. App packages (ui/stdio-agent, ui/acp-agent) consume it and add only a front door; a leaf adds the swappable backends plus any optional product tools it wants to expose. It lives in core/ because it composes exclusively core/ + interface packages and ships no provider, executor, or UI of its own.