Function parseMessages

src/proxy.ts:528–575

(messages: OpenAIMessage[])

}

function parseMessages(messages: OpenAIMessage[]): ParsedMessages {
  let systemPrompt = "You are a helpful assistant.";
  const pairs: Array<{ userText: string; assistantText: string }> = [];
  const toolResults: ToolResultInfo[] = [];

  // Collect system messages
  const systemParts = messages
    .filter((m) => m.role === "system")
    .map((m) => textContent(m.content));
  if (systemParts.length > 0) {
    systemPrompt = systemParts.join("\n");
  }

  // Separate tool results from conversation turns
  const nonSystem = messages.filter((m) => m.role !== "system");
  let pendingUser = "";

  for (const msg of nonSystem) {
    if (msg.role === "tool") {
      toolResults.push({
        toolCallId: msg.tool_call_id ?? "",
        content: textContent(msg.content),
      });
    } else if (msg.role === "user") {
      if (pendingUser) {
        pairs.push({ userText: pendingUser, assistantText: "" });
      }
      pendingUser = textContent(msg.content);
    } else if (msg.role === "assistant") {
      // Skip assistant messages that are just tool_calls with no text
      const text = textContent(msg.content);
      if (pendingUser) {
        pairs.push({ userText: pendingUser, assistantText: text });
        pendingUser = "";
      }
    }
  }

  let lastUserText = "";
  if (pendingUser) {
    lastUserText = pendingUser;
  } else if (pairs.length > 0 && toolResults.length === 0) {
    const last = pairs.pop()!;
    lastUserText = last.userText;
  }

  return { systemPrompt, userText: lastUserText, turns: pairs, toolResults };
}

/** Convert OpenAI tool definitions to Cursor's MCP tool protobuf format. */
function buildMcpToolDefinitions(tools: OpenAIToolDef[]): McpToolDefinition[] {