Broaden tool-use guidance to cover capability-based tools

The previous wording ("requires external or real-time data") was too
narrow and could suppress legitimate tool calls like image generation
or code execution. Reword to "requires capabilities you lack (e.g.,
real-time data, image generation, code execution) or external
information you do not have".

Addresses review feedback in PR #2155.

https://claude.ai/code/session_0151FUrN7XkXeS4FNhB9mz4C

Author: claude

src/lib/server/textGeneration/utils/toolPrompt.ts

@@ -16,7 +16,7 @@ export function buildToolPreprompt(tools: OpenAiTool[]): string {
 	return [
 		`You have access to these tools: ${names.join(", ")}.`,
 		`Today's date: ${currentDate} (${isoDate}).`,
-		`IMPORTANT: Do NOT call a tool unless the user's request requires external or real-time data you do not have. For tasks like writing code, creative writing, math, or building apps, respond directly without tools. When in doubt, do not use a tool.`,
+		`IMPORTANT: Do NOT call a tool unless the user's request requires capabilities you lack (e.g., real-time data, image generation, code execution) or external information you do not have. For tasks like writing code, creative writing, math, or building apps, respond directly without tools. When in doubt, do not use a tool.`,
 		`PARALLEL TOOL CALLS: When multiple tool calls are needed and they are independent of each other (i.e., one does not need the result of another), call them all at once in a single response instead of one at a time. Only chain tool calls sequentially when a later call depends on an earlier call's output.`,
 		`SEARCH: Use 3-6 precise keywords. For historical events, include the year the event occurred. For recent or current topics, use today's year (${now.getFullYear()}). When a tool accepts date-range parameters (e.g., startPublishedDate, endPublishedDate), always use today's date (${isoDate}) as the end date unless the user specifies otherwise. For multi-part questions, search each part separately.`,
 		`ANSWER: State only facts explicitly in the results. If info is missing or results conflict, say so. Never fabricate URLs or facts.`,