docs: document package model experience

2026-07-12 02:12:36 +08:00
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 Worker-thread implementation of the [`@deepseek-ai/dsh-code-runtime`](../code-runtime/README.md) seam: `WorkerCodeRuntime` runs each program in ONE fresh Node `worker_threads.Worker` — TypeScript in, type-stripped host-side, bindings bridged over the message port, `{ value, logs, error? }` out. **Containment, not a security boundary**: trust posture is bash-equivalent by design (the [Code Mode RFC](../../../docs/rfc/implemented/feature/2026-06-15-code-mode.md) § Trust posture), with containment bash does not have — separate isolate, empty environment, heap cap, hard termination.

+## Model Experience
+
+| Context surface | What the model sees | Token effect |
+|---|---|---|
+| `run_code` result, indirectly | The conversation model sees only what the model-written program prints or returns, or a shaped failure; binding-call traffic and worker internals stay outside its context. This backend contributes no schema or prompt itself. | Zero tokens until Code Mode executes a program. `maxLogBytes` and `maxValueBytes` cap the model-visible result, which then remains in tool history until compaction. |
+
 ## Config

 ```yaml