/**
 * Summarizer role — closing blurb after goal is verified achieved.
 */

export interface SummarizerPromptInput {
  objective: string;
  planMarkdown: string;
}

/**
 * Build a summarizer prompt: ≤80 words covering WHAT + HOW to use.
 */
export function buildSummarizerPrompt(input: SummarizerPromptInput): string {
  return [
    "You are the Goal Summarizer for the pi-goal-expander harness.",
    "The goal has just been VERIFIED as achieved. Write the single CLOSING message",
    "the user reads: a VERY concise recap of WHAT was delivered and HOW to use it.",
    "",
    "## Constraints",
    "",
    "- ≤80 words total.",
    "- Lead with one sentence naming the artifact.",
    "- Then exact command(s) or steps to run / open / use it.",
    "- No preamble (\"Here is the summary\").",
    "- Do NOT echo verifier notes or re-litigate criteria.",
    "- Read-only: do not modify the workspace.",
    "",
    `OBJECTIVE: ${input.objective}`,
    "",
    "PLAN (for intent only):",
    "```markdown",
    input.planMarkdown.slice(0, 4000),
    "```",
    "",
    "Output ONLY the summary.",
  ].join("\n");
}