+// prompt returns the system prompt of the reference with one added paragraph on
+// the user's instructions file at instructionsPath. It uses the agent name and
+// ends with the user's instructions. Without instructions it has neither them
+// nor the clause that points to them, but keeps the file paragraph. Turns and
+// compactions send the same prompt and tools, so compactions read the prompt
+// cache of the turns.
+func prompt(name, instructionsPath, instructions string) string {
+ text := strings.NewReplacer(promptName, name, promptInstructionsPath, instructionsPath).Replace(promptText)
+ text = strings.Replace(text, "\n\n# Compactions", promptChildrenText+"\n\n# Compactions", 1)
+
+ return promptWithInstructions(text, promptTaskSentence, promptInstructionsClause, instructions)
+}
+
+// promptWithInstructions returns text with the instructions of the user at its
+// end, after the heading. With instructions, sentence gets clause, which points
+// to them. Without instructions the prompt has neither them nor the clause.
+func promptWithInstructions(text, sentence, clause, instructions string) string {
+ instructions = strings.TrimSpace(instructions)
+ if instructions == "" {
+ return text
+ }
+
+ text = strings.Replace(text, sentence, strings.TrimSuffix(sentence, ".")+clause+".", 1)
+
+ return text + promptInstructionsHeading + instructions
+}
+