AgenticCode/openspec/changes/archive/2026-04-06-expose-prompt-settings/design.md at 5b027eb0dbd29aedc501a2f54b155939aa6e307c

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local 5b027eb0db feat: add extraction schema, sidebar nav, few-shot prompting, and prompt settings

Overhaul extraction pipeline with new TradeItem model, conversation flow,
and dedicated extraction endpoint. Add sidebar navigation with NavMenu
component and landing page. Introduce few-shot prompting service and
tests. Add prompt settings and email upload specs. Update OpenSpec
tooling with improved export-spec and extract-feature commands. Archive
completed changes and export full specs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-06 23:39:23 +01:00

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Context

The chat page currently has a single-panel layout: message list + input. The system prompt is absent (no system message in ChatHistory), and model parameters like temperature use Semantic Kernel defaults. For prompt engineering and debugging, these need to be editable in the UI without restarting the server.

Goals / Non-Goals

Goals:

Tabbed UI: Chat, System Prompt, Model Settings — all on the same page
System prompt and model settings sent with each chat request
Backend applies them to SK's ChatHistory and OpenAIPromptExecutionSettings
Settings persist in the browser session (survive tab switches, not page reloads)

Non-Goals:

Persisting settings to disk or server (future — save/load prompt profiles)
Phase 2 prompt templates and few-shot examples (scoped in proposal, not implemented here)
Changing the SSE streaming contract

Decisions

Tabbed layout using MudTabs

Use MudTabs with MudTabPanel for each section: Chat, System Prompt, Model Settings
Alternative considered: MudDrawer panels or separate pages. Rejected because tabs keep everything on one page — switching between prompt and chat should be instant with no navigation.
The Chat tab contains the existing message list and input (unchanged)
System Prompt tab: a MudTextField with Lines="10" for multi-line editing
Model Settings tab: MudNumericField or MudSlider for Temperature (0.0–2.0), TopP (0.0–1.0), MaxTokens (1–4096)

Settings sent per-request, not stored server-side

ChatRequest gains optional SystemPrompt (string?) and Settings (ModelSettings?) properties
Backend treats them as nullable — if absent, defaults apply (no system prompt, SK default temperature)
This keeps the API stateless and avoids server-side session management
Alternative considered: Server-side settings endpoint. Rejected — adds complexity for a single-user debugging tool.

ModelSettings as a shared DTO

New ModelSettings.cs in Shared/Models with Temperature (double?), TopP (double?), MaxTokens (int?)
All fields nullable — only set values override defaults
Maps directly to OpenAIPromptExecutionSettings properties on the backend

System prompt applied as ChatHistory system message

chatHistory.AddSystemMessage(request.SystemPrompt) as the first entry before user/assistant messages
SK and OpenAI APIs treat the system message as behavioral instructions for the model

Tab state persists in component fields

_systemPrompt and _modelSettings are component-level fields, not per-tab
Switching tabs doesn't reset values (MudTabs preserves panel content by default)
Values are lost on page refresh — acceptable for a debugging tool

Risks / Trade-offs

[Tab switch loses scroll position] → MudTabs renders all panels but hides inactive ones, so scroll position in the chat tab is preserved
[Large system prompts inflate request size] → Acceptable for single-user debugging; no size limit enforced
[Temperature/TopP interaction] → Standard OpenAI behavior: setting both is allowed but not recommended. Show a note in the UI, don't enforce.

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