16. Building the System Prompt

export function buildSystemPrompt(options: BuildSystemPromptOptions = {}): string {
  // Build tools list
  const tools = selectedTools || ["read", "bash", "edit", "write"];
  const toolsList = tools
    .filter((name) => !!toolSnippets?.[name])
    .map((name) => `- ${name}: ${toolSnippets![name]}`)
    .join("\n");

  let prompt = `You are an expert coding assistant operating inside pi, a coding agent harness.

Available tools:
${toolsList}

Guidelines:
${guidelines}`;

  // Add date and working directory
  prompt += `\nCurrent date: ${date}`;
  prompt += `\nCurrent working directory: ${promptCwd}`;

  return prompt;
}

const systemPrompt = `You are a coding assistant. You can read, edit, and create files.

Available tools:
- read: Read a file from disk
- edit: Edit a file using string replacement
- write: Create or overwrite a file
- bash: Run a shell command

Current directory: ${process.cwd()}
Current date: ${new Date().toISOString().split("T")[0]}`;