Yichen Jiang
e258cf7a2d
`collapses()` read `defaultMode`, so the collapse only applied when the DEPLOYMENT was `code`. An agent handed `code` by an agent preset under a native default announced `[run_code]` on the wire and still executed a model-direct native call -- the bypass this collapse exists to close, reopened for exactly the composition `dsh-agent-tool-mode` produces. `modeFor(scope)` is the same resolution `wireSchemas` and the SDK section already use, so presentation and execution cannot disagree, and a mode inherited from a standing preset scope collapses like a declared one. The per-agent and preset tests asserted only the wire, which is why the regression passed them. They now assert through the executor: the body never runs, the call resolves UNKNOWN_TOOL, and the native sibling beside it still executes.
core/ — product API spine
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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.
| 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-default-model/ |
Default model selection shared by Agent entry points | ctx.agentDefaultModel |
agent-loop/ |
Default concrete agent driver | ctx.agentLoop |
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.
Runnable compositions belong to examples/agent-spine-demo; this group owns only the swappable spine pieces.
The subsystem reference — the package-by-package loop map, the Agent handle and its delivery/interception contracts — is docs/subsystems/core.md; the default runnable composition is examples/agent-spine-demo.