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docs: reserve seam for complete capabilities

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2026-08-09 15:34:32 +08:00
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packages/llm/llm/README.md
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@@ -71,7 +71,7 @@ Every adapter that puts a credential in an HTTP header judges it the same way be
- `LlmAdapter` — abstract base class for provider adapters. The only required method is `stream()`.
- `BlockAssembler` — incrementally assembles raw chunks into complete content blocks and can create an identified, frozen assistant message from them. The agent loop feeds it raw chunks (logging them for replay) while reading the assembled blocks for history.
- `HarnessError` — base class for the harness error taxonomy: a stable `code` string (distinct from the human `message`) plus `cause` chaining. Lives here, in the leaf package every other imports, so a single base is shared without a new dependency edge. Per-package errors (`LlmError`, `ToolArgsError`, `InvariantError`, …) extend it. `isHarnessError(value)` narrows at seams.
- `HarnessError` — base class for the harness error taxonomy: a stable `code` string (distinct from the human `message`) plus `cause` chaining. Lives here, in the leaf package every other imports, so a single base is shared without a new dependency edge. Per-package errors (`LlmError`, `ToolArgsError`, `InvariantError`, …) extend it. `isHarnessError(value)` narrows at process boundaries.
- `LlmError` — extends `HarnessError`; its stable `code` string (`NO_ADAPTER`, `DUPLICATE_ADAPTER`, and adapter codes like `AUTH`/`RATE_LIMIT`) matches its frozen serializable `failure.code`. The payload may also retain validated status, `Retry-After`, and branded provider request id facts; policy remains outside the error.
- `errorChain(value)` — renders a thrown value with its full `cause` chain and AggregateError members for diagnostic surfaces (UI notices, logger lines, durable `turn/end` messages), so transport wrappers like undici's `TypeError: fetch failed` surface the underlying `ECONNREFUSED`/DNS/TLS detail instead of masking it. Rendering only — route on `code`, never by parsing the result.
- `CONTEXT_WINDOW_EXCEEDED_CODE` — the provider-neutral code both DeepSeek adapters use when a request exceeds the model context window, regardless of thrown-HTTP versus in-band finish delivery. `isContextWindowExceededError(detail)` is their shared conservative classifier for OpenAI-compatible provider detail.
@@ -93,7 +93,7 @@ Pass-through; the registry preserves the assembled request prefix, while the sel
## Known Limitations and Deferred Work
- **No retry execution, caching, or rate limiting ships in this service** — provider registration stores retry policy, but `llm/stream` remains a single-attempt call-wrapper seam. The agent loop separately offers proven model-request failures to `agent/request-error`, whose default preserves the original failure; `@deepseek-ai/dsh-llm-retry` is the optional executor loaded by the shared example spine.
- **No retry execution, caching, or rate limiting ships in this service** — provider registration stores retry policy, but `llm/stream` remains a single-attempt call wrapper. The agent loop separately offers proven model-request failures to `agent/request-error`, whose default preserves the original failure; `@deepseek-ai/dsh-llm-retry` is the optional executor loaded by the shared example spine.
- **`GenerateOptions` sampling is `temperature`/`maxTokens`/`stop` only** — no `tool_choice`, `top_p`, or penalty fields; the vocabulary grows when a producer lands ([dropped inert knobs](../../../.agents/notes/archived/simplification/2026-07-04-drop-inert-request-knobs.md)).
- **Producer-gated variants stay out until produced** — `prefill`, per-tool `strict`, block `cache` hints, and the `agent` message-source variant were pruned as producerless ([Agent Note](../../../.agents/notes/archived/simplification/2026-07-04-prune-producerless-vocabulary-variants.md)).
- **`BlockAssembler` handles core block kinds only** — a plugin-added block type whose stream is never closed by `block-end` makes `blocks()` throw.