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feat(system-prompt): prompt variables, persona-as-section, tool-guidance ownership

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One principle: every fact in the assembled prompt has exactly one owner.

- dsh-system-prompt: merge-extensible AssembleContext on assemble();
  a variable(name, provider) registry; {{name}} interpolation in
  renderPrompt, strict (unknown/valueless/malformed references throw);
  duplicate section and variable names rejected; assembly carries
  resolved section text + variables through the assemble waterfall.
- dsh-agent declares AssembleContext.agent; dsh-agent-loop registers
  the agent:persona section (order 0 - identity renders before tool
  guidance) and the model/cwd variables, and drops its string join:
  renderPrompt(assembly) IS the full prompt.
- Tool guidance moves to its owners: descriptions carry per-tool
  semantics; sections only cross-call habits (tool:bash exit-code
  habit at order 105; read's not-shell nudge). todo/subagent need no
  section - their descriptions already carry the contract.
- SubagentProvider.inheritsParentContext (spawn/acp false, fork true);
  dsh-tool-subagent derives truthful per-provider wording and resolves
  the provider at load (backend must be listed first).
- Example personas shrink to identity + behavior with {{model}} (and
  {{cwd}} in the ACP tree); the welcome banner stops enumerating tools.

RFC: docs/rfc/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.md
This commit is contained in:
Tianyi Cui
2026-07-05 01:54:46 +08:00
parent 1e2efc861e
commit f256f3961d
41 changed files with 746 additions and 177 deletions
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packages/ui/acp-agent/README.md
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@@ -23,7 +23,7 @@ Because the package wires no logger entry, an ACP leaf has **nothing to get wron
| Key | Default | Routed to |
|---|---|---|
| `model` | (required) | the per-session agent template the bridge creates agents from |
| `systemPrompt` | (required) | the per-session agent's system prompt |
| `systemPrompt` | (required) | the per-session agent's persona template (may reference `{{model}}`/`{{cwd}}`) |
| `persistenceRoot` | `./.sessions` | the JSONL backend's root directory |
The leaf supplies the swappable backends: an LLM adapter (`llm-deepseek` for the real model, `llm-replay` for keyless snapshot replay) and a bash executor (`bash-local`).