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feat: add custom system message setting for AI personalization (#728)

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* feat: add custom system message setting for AI personalization

Allow users to enter custom instructions via a textarea in Settings
that get appended to the AI's system prompt. Includes server-side
validation (type check + 5000 char limit), localStorage persistence,
and i18n support for all 4 locales.

* fix: add accessibility htmlFor/id pairing on custom system message textarea
This commit is contained in:
Dayuan Jiang
2026-03-07 19:07:54 +09:00
committed by GitHub
parent be4bc916fd
commit e7453e86a6
8 changed files with 82 additions and 10 deletions
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18
app/api/chat/route.ts
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@@ -90,7 +90,12 @@ async function handleChatRequest(req: Request): Promise<Response> {
}
}
const { messages, xml, previousXml, sessionId } = await req.json()
const body = await req.json()
const { messages, xml, previousXml, sessionId } = body
const customSystemMessage =
typeof body.customSystemMessage === "string"
? body.customSystemMessage.slice(0, 5000)
: ""
// Get user ID for Langfuse tracking and quota
const userId = getUserIdFromRequest(req)
@@ -252,6 +257,9 @@ async function handleChatRequest(req: Request): Promise<Response> {
// Get the appropriate system prompt based on model (extended for Opus/Haiku 4.5)
const systemMessage = getSystemPrompt(modelId, minimalStyle)
const finalSystemMessage = customSystemMessage
? `${systemMessage}\n\n## Custom Instructions\n${customSystemMessage}`
: systemMessage
// Extract file parts (images) from the last user message
const fileParts =
@@ -424,7 +432,7 @@ ${userInputText}
}
// System messages with multiple cache breakpoints for optimal caching:
// - Breakpoint 1: Static instructions (~1500 tokens) - rarely changes
// - Breakpoint 1: System instructions + custom instructions - changes when user updates custom system message
// - Breakpoint 2: Current XML context - changes per diagram, but constant within a conversation turn
// Some providers (e.g. MiniMax) don't support multiple system messages
// Merge them into a single system message for compatibility
@@ -450,14 +458,14 @@ IMPORTANT: The "Current diagram XML" is the SINGLE SOURCE OF TRUTH for what's on
? [
{
role: "system" as const,
content: `${systemMessage}\n\n${xmlContext}`,
content: `${finalSystemMessage}\n\n${xmlContext}`,
},
]
: [
// Cache breakpoint 1: Instructions (rarely change)
// Cache breakpoint 1: Instructions (+ optional custom instructions)
{
role: "system" as const,
content: systemMessage,
content: finalSystemMessage,
...(shouldCache && {
providerOptions: {
bedrock: { cachePoint: { type: "default" } },