Tianyi Cui
f256f3961d
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
@deepseek-ai/dsh-tool-web
The model-facing web tool suite — web_search and web_fetch — over the web capability seam (ctx.web). It owns model-facing concerns only: tool names, JSON schemas, snake_case argument names, prompt sections, the result-count bound, result formatting, HTML→markdown presentation, and presentCall. All web access goes through ctx.web; this package never imports a concrete provider.
Each tool is registered independently; a product that wants only one disables the other via config ({ search: false } / { fetch: false }).
Tools
| Tool | Args | Behavior |
|---|---|---|
web_search |
query (string) |
Discovery. Returns an optional answer plus source URLs. max_results is not model-facing — the tool sets the bound (the searchMaxResults config, default 8) and passes it to the seam. |
web_fetch |
url (string), timeout_ms (number, optional) |
Retrieves a specific URL. HTML bodies are rendered to markdown-ish text; text bodies pass through. A non-2xx status is reported, not an error. |
Config
| Key | Default | Meaning |
|---|---|---|
search |
true |
Register web_search. |
fetch |
true |
Register web_fetch. |
searchMaxResults |
8 |
Upper bound on sources returned by one web_search call (the seam truncates a longer provider list and flags it). |
- id: tool-web
name: '@deepseek-ai/dsh-tool-web'
Stable registration
Tool registration follows product enablement, not backend availability. A tool stays visible even when its selected provider is missing, misconfigured, ambiguous, or temporarily unavailable; the seam resolves the provider at execution time and execution fails with a structured WebError (e.g. WEB_PROVIDER_UNAVAILABLE, WEB_PROVIDER_AMBIGUOUS), which ToolRegistry.execute() turns into an error tool result the model can read and hooks/UI can route on. This keeps the model schema stable without making plugin load order, credential state, or HMR timing part of the model-facing contract. To remove a web tool entirely, disable it here in config.
The tool never calls a provider's status() and never enumerates providers — its only execution path is ctx.web.search() / ctx.web.fetch(), and provider unavailability reaches it as the structured WebError codes selection throws at execution time. Provider selection stays entirely inside the seam, with one owner.