Tianyi Cui
066f94c7e0
Hard line breaks mid-paragraph make docs harder to edit and diff — a one-word change reflows and re-diffs the whole paragraph. Reflow all tracked non-vendor Markdown (plus vendor/AGENTS.md) so each prose paragraph is a single line; soft-wrapping is the editor's job. Fenced code, tables, and list structure are preserved (wrapped list items fold to one line per bullet). Documents the convention in AGENTS.md.
20 lines
1.7 KiB
Markdown
20 lines
1.7 KiB
Markdown
# ADR 0004: Provider-neutral content-block vocabulary owned by dsh-llm
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Status: accepted (2026-06-11)
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## Context
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The harness needs one internal language for messages that the loop, session log, and all plugins speak. Options: mirror the DeepSeek/OpenAI chat-completions shape (zero mapping for the first provider, awkward for rich content), adopt Anthropic's Messages block structure verbatim (battle-tested, but our canonical types would mirror a third-party API we don't target first), or own a vocabulary.
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## Decision
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Own it: messages are arrays of typed content blocks (`text`, `reasoning`, `tool-call`, `tool-result`, `image`), with the union derived from the merge-extensible `ContentBlockMap` so plugins add block types via declaration merging. The same merge-extensible-map pattern types every "stringly" field (`MessageSource`, `FinishReason`, `TurnTrigger`, `TurnEndReason`). Streaming is a raw chunk protocol; `BlockAssembler` is the single shared assembly implementation. Adapters translate to provider wire formats — mapping cost lives in adapters, where it belongs.
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In-session context injection (`context/message`, `steering/message`) renders as tagged user-role envelopes (the system-reminder pattern) rather than a new role, so adapters carry zero burden. TODO(review): revisit once the DeepSeek V4 adapter exists.
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## Consequences
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- Reasoning, prefill, cache hints, and multimodal content all have a home without provider contortions.
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- Every adapter pays a translation cost; the streaming protocol carries a TODO(review) marker until the first real adapter validates it.
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- IDs that cross package boundaries are branded (`CallId`, `SessionId`, `AgentId`) — nominal typing at zero runtime cost.
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