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feat(agent-loop): open every prompt with the harness identity section

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A static harness:identity section at order -100 — the first occupant of
the documented negative band — states that the agent is powered by the
DeepSeek Harness SDK before the deployment's persona renders. Harness
attribution is a harness fact: it lives on the loop plugin, not in each
deployment's persona, so every agent (subagents included) carries it and
no YAML can forget it. A deployment that must drop it can remove the
section in the system-prompt/assemble waterfall.

Order-band docs updated in all five homes (PromptSection JSDoc, the
system-prompt and agent-loop READMEs, architecture.md, the RFC).
This commit is contained in:
Tianyi Cui
2026-07-05 11:37:32 +08:00
parent 2f191cc72b
commit 00cf8b693a
7 changed files with 31 additions and 22 deletions
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docs/rfc/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.md
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@@ -30,7 +30,7 @@ Plugins contribute named values via `ctx.systemPrompt.variable(name, provider)`;
### Persona as the order-0 section
The loop plugin registers ONE section, `agent:persona` at order 0, whose text is `context.agent?.options.systemPrompt ?? ''`. The loop's special-case join is deleted: `fullSystemPrompt ≡ renderPrompt(assembly)`, one ordered pipeline for everything the model sees, and `agent/pre-step` (compaction's token-pressure input) measures exactly the real prompt. Order bands are now convention: persona `0`, tool guidance `100–199`, negative orders render before the persona. `AgentOptions.systemPrompt` keeps its familiar key but is documented as what it is — the persona template fragment, one section of the full prompt, never the whole (see `CONTEXT.md`).
The loop plugin registers ONE section, `agent:persona` at order 0, whose text is `context.agent?.options.systemPrompt ?? ''`. The loop's special-case join is deleted: `fullSystemPrompt ≡ renderPrompt(assembly)`, one ordered pipeline for everything the model sees, and `agent/pre-step` (compaction's token-pressure input) measures exactly the real prompt. Order bands are now convention: harness identity `-100` (the loop's static `harness:identity` section — every agent's prompt opens by stating it is powered by the DeepSeek Harness SDK), persona `0`, tool guidance `100–199`; other negative orders also render before the persona. `AgentOptions.systemPrompt` keeps its familiar key but is documented as what it is — the persona template fragment, one section of the full prompt, never the whole (see `CONTEXT.md`).
### Tool guidance ownership