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# core/ — product API spine
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English | [中文 ](README.zh.md )
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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.
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| Package | Role | ctx key |
|---|---|---|
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| [`scope/` ](scope/README.md ) | Scoped-context registration primitive | library — no ctx key |
| [`session/` ](session/README.md ) | Event-sourced session log and in-memory store | `ctx.sessions` |
| [`system-prompt/` ](system-prompt/README.md ) | Prompt and tool-schema assembly registry | `ctx.systemPrompt` |
| [`tools/` ](tools/README.md ) | Scoped tool registry and execution pipeline | `ctx.tools` |
| [`agent/` ](agent/README.md ) | Agent interface, registry, and event vocabulary | `ctx.agents` |
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| [`agent-default-model/` ](agent-default-model/README.md ) | Default model selection shared by Agent entry points | `ctx.agentDefaultModel` |
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| [`agent-loop/` ](agent-loop/README.md ) | Default concrete agent driver | `ctx.agentLoop` |
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`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 entry point uses only when a session has no selection of its own.
docs: agent-scope RFC, CONTEXT.md glossary, architecture scope section, README sync
The agent-scope-contexts RFC (implemented) records the decision tree:
the dsh-scope primitive over cordis extend/Context.filter/no-op fibers,
two-level flat scope with shadowing, restriction/grant semantics, the
scoped-dispatch rule with fused helpers, the setup window, and the
alternatives (explicit scope params, isolate, event-filtering-only,
vendored support) with why each lost. CONTEXT.md pins the glossary.
architecture.md gains the Agent Scope section, the dsh-scope spine row,
the scoped turn-flow line, and an extension-table row (ceiling 1640→1790:
the two-layer registration model is a new architectural axis; additions
are condensed to pointers). READMEs of every touched package re-state
their scoped facts; the stale structured-runtime README section is
replaced by the scoped-registration description.
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Runnable compositions belong to [`examples/agent-spine-demo` ](../examples/agent-spine-demo/README.md ); this group owns only the swappable spine pieces.
docs: anchor each subsystem page to its package group; make group READMEs thin tables
core.md read as a type grab-bag: LLM wire vocabulary up front, the agent/loop story buried, and no correspondence to packages/core. It now opens on the packages/core control spine — the package-by-package loop map with a Page column into session/system-prompt/tools/scope — and keeps only what the spine group declares plus the repo-wide patterns: the Agent handle with its delivery/cancellation/interception contracts, the SessionEvent envelope, branded ids, the …Map pattern. The conversation vocabulary (Message/ContentBlock, the model request, adapters — 17 type-equiv blocks) moves to llm-streaming.md, which now declares packages/llm end-to-end; the duplicate ContentBlockMap paste near its seam section folds into the moved section, and the manifest, LINK_MAP, README table rows, website label (Core data structures → Core), and inbound anchors follow.
Every packages/<group>/README pair is now a thin front door in one shape: a why-first intro (bash's seam-pattern-first paragraph rewritten as 'shell execution for the agent'), the package table, and a closing pointer to the owning docs/subsystems page — the bash-style table stays the load-bearing middle. Load-bearing trailing paragraphs relocate rather than vanish: the fs no-timeout rationale becomes a filesystem.md section (both languages), session's four sectioned tables merge into one 12-row table, examples' legacy-bin H2 collapses to a pointer at jsonrpc-demo's README, and design rationale that already lives in an Agent Note or subsystem page is now linked instead of restated. All 40 pair records re-recorded.
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The subsystem reference — the package-by-package loop map, the `Agent` handle and its delivery/interception contracts — is [docs/subsystems/core.md ](../../docs/subsystems/core.md ); the default runnable composition is [`examples/agent-spine-demo` ](../examples/agent-spine-demo/README.md ).