Function convertToCursorRequest

src/converter.ts:210–837

(req: AnthropicRequest)

 * 不覆盖模型身份，而是顺应它在 IDE 内的角色，让它认为自己在执行 IDE 内部的自动化任务
 */
export async function convertToCursorRequest(req: AnthropicRequest): Promise<CursorChatRequest> {
    const config = getConfig();

    // ★ 图片预处理：在协议转换之前，检测并处理 Anthropic 格式的 ImageBlockParam
    await preprocessImages(req.messages);

    // ★ 预估原始上下文大小，驱动动态工具结果预算
    let estimatedContextChars = 0;
    if (req.system) {
        estimatedContextChars += typeof req.system === 'string' ? req.system.length : JSON.stringify(req.system).length;
    }
    for (const msg of req.messages ?? []) {
        estimatedContextChars += typeof msg.content === 'string' ? msg.content.length : JSON.stringify(msg.content).length;
    }
    if (req.tools && req.tools.length > 0) {
        estimatedContextChars += req.tools.length * 150; // 压缩后每个工具约 150 chars
    }
    setCurrentContextChars(estimatedContextChars);

    const messages: CursorMessage[] = [];
    const hasTools = req.tools && req.tools.length > 0;

    // 提取系统提示词
    let combinedSystem = '';
    if (req.system) {
        if (typeof req.system === 'string') combinedSystem = req.system;
        else if (Array.isArray(req.system)) {
            combinedSystem = req.system.filter(b => b.type === 'text').map(b => b.text).join('\n');
        }
    }

    // ★ 计费头清除：x-anthropic-billing-header 会被模型判定为恶意伪造并触发注入警告
    if (combinedSystem) {
        combinedSystem = combinedSystem.replace(/^x-anthropic-billing-header[^\n]*$/gim, '');
        // ★ Claude Code 身份声明清除：模型看到 "You are Claude Code" 会认为是 prompt injection
        combinedSystem = combinedSystem.replace(/^You are Claude Code[^\n]*$/gim, '');
        combinedSystem = combinedSystem.replace(/^You are Claude,\s+Anthropic's[^\n]*$/gim, '');
        combinedSystem = combinedSystem.replace(/\n{3,}/g, '\n\n').trim();
    }
    // ★ Thinking 提示注入：根据是否有工具选择不同的注入位置
    // 有工具时：放在工具指令末尾（不会被工具定义覆盖，模型更容易注意）
    // 无工具时：放在系统提示词末尾（原有行为，已验证有效）
    const thinkingEnabled = req.thinking?.type === 'enabled' || req.thinking?.type === 'adaptive';
    const thinkingHint = '\n\n**IMPORTANT**: Before your response, you MUST first think through the problem step by step inside <thinking>...</thinking> tags. Your thinking process will be extracted and shown separately. After the closing </thinking> tag, provide your actual response or actions.';
    if (thinkingEnabled && !hasTools) {
        combinedSystem = (combinedSystem || '') + thinkingHint;
    }

    if (hasTools) {
        const tools = req.tools!;
        const toolChoice = req.tool_choice;
        const toolsCfg = config.tools || { schemaMode: 'compact', descriptionMaxLength: 50 };
        const isDisabled = toolsCfg.disabled === true;
        const isPassthrough = toolsCfg.passthrough === true;

        if (isDisabled) {
            // ★ 禁用模式：完全不注入工具定义和 few-shot 示例
            // 目的：最大化节省上下文空间，让模型凭训练记忆处理工具调用