diff --git a/packages/cli/src/index.ts b/packages/cli/src/index.ts
index 603afe4..01a42bb 100644
--- a/packages/cli/src/index.ts
+++ b/packages/cli/src/index.ts
@@ -637,9 +637,9 @@ const videoCmd = defineCommand({
     'video-urls': { type: 'string', description: 'comma-separated public source video URLs (max 3)' },
     operation: { type: 'string', default: 'generate', description: 'generate | edit' },
     quality: { type: 'string', description: 'economy | balanced | quality (provider-neutral intent)' },
-    ratio: { type: 'string', default: '16:9', description: '16:9 | 9:16 | 1:1 | 4:3 | 3:4 | 21:9' },
-    duration: { type: 'string', default: '5', description: '4-15 seconds' },
-    resolution: { type: 'string', default: '720p', description: '480p | 720p | 1080p' },
+    ratio: { type: 'string', default: '16:9', description: '16:9 | 9:16 | 1:1 | 4:3 | 3:4 | 21:9 | adaptive (Atlas-only)' },
+    duration: { type: 'string', default: '5', description: '4-15 seconds, or -1 (Atlas-only) for a provider-chosen length' },
+    resolution: { type: 'string', default: '720p', description: '480p | 720p | 1080p; -SR variants and 4k are Atlas-only' },
     'generate-audio': { type: 'boolean', default: true },
   },
   async run({ args }) {
diff --git a/packages/mcp/src/index.ts b/packages/mcp/src/index.ts
index 7ef305a..b2faa71 100644
--- a/packages/mcp/src/index.ts
+++ b/packages/mcp/src/index.ts
@@ -254,7 +254,7 @@ server.tool(
 );
 server.tool(
   'video',
-  'Generate a video clip via the configured BYO provider (Doubao Seedance), with exact Gate C settings.',
+  'Generate a video clip via the configured BYO provider (Doubao Seedance or Atlas Cloud), with exact Gate C settings.',
   {
     prompt: z.string(),
     output: z.string(),
@@ -264,9 +264,9 @@ server.tool(
     reference_video_urls: z.array(z.string()).max(3).optional(),
     operation: z.enum(['generate', 'edit']).optional(),
     quality: z.enum(['economy', 'balanced', 'quality']).optional(),
-    ratio: z.enum(['16:9', '9:16', '1:1', '4:3', '3:4', '21:9']).optional(),
-    duration: z.number().min(4).max(15).optional(),
-    resolution: z.enum(['480p', '720p', '1080p']).optional(),
+    ratio: z.enum(['16:9', '9:16', '1:1', '4:3', '3:4', '21:9', 'adaptive']).optional().describe('adaptive is Atlas-only (follows the source/first frame)'),
+    duration: z.union([z.literal(-1), z.number().min(4).max(15)]).optional().describe('4-15 seconds; -1 (Atlas-only) lets the provider choose'),
+    resolution: z.enum(['480p', '720p', '1080p', '720p-SR', '1080p-SR', '1440p-SR', '4k']).optional().describe('the -SR variants and 4k are Atlas-only'),
     generate_audio: z.boolean().optional(),
   },
   (a) => format(video.generateVideo(a)),
diff --git a/packages/tools/src/video/video.ts b/packages/tools/src/video/video.ts
index 6b53385..5eb6cb8 100644
--- a/packages/tools/src/video/video.ts
+++ b/packages/tools/src/video/video.ts
@@ -28,9 +28,13 @@ export interface VideoParams {
   reference_video_urls?: string[];
   operation?: 'generate' | 'edit';
   quality?: 'economy' | 'balanced' | 'quality';
-  ratio?: '16:9' | '9:16' | '1:1' | '4:3' | '3:4' | '21:9';
+  /** `adaptive` (Atlas: follow the source/first frame) is Atlas-only; other
+   *  providers reject it with their own error. */
+  ratio?: '16:9' | '9:16' | '1:1' | '4:3' | '3:4' | '21:9' | 'adaptive';
+  /** 4-15 seconds; Atlas additionally accepts -1 (provider-chosen length). */
   duration?: number;
-  resolution?: '480p' | '720p' | '1080p';
+  /** The `-SR` super-resolution variants and `4k` are Atlas-only. */
+  resolution?: '480p' | '720p' | '1080p' | '720p-SR' | '1080p-SR' | '1440p-SR' | '4k';
   generate_audio?: boolean;
 }
 
@@ -58,8 +62,8 @@ export function buildAtlasCreateRequest(cfg: VideoProviderConfig, p: VideoParams
     throw new Error('video: Atlas Cloud accepts a single first-frame image_url; additional references are not supported');
   }
   const duration = p.duration ?? 5;
-  if (!Number.isFinite(duration) || duration < 4 || duration > 15) {
-    throw new Error('video: duration must be between 4 and 15 seconds');
+  if (duration !== -1 && (!Number.isFinite(duration) || duration < 4 || duration > 15)) {
+    throw new Error('video: duration must be between 4 and 15 seconds, or -1 for a provider-chosen length');
   }
   // Default the model by task type, and fail closed on an explicit mismatch:
   // a text-to-video model given a first frame would silently produce a video
@@ -194,7 +198,7 @@ export function validateDownloadedVideo(buffer: Buffer): void {
 export async function generateVideo(params: VideoParams, config: OvsConfig = loadConfig(), opts: GenerateVideoOpts = {}): Promise<VideoResult> {
   const cfg = config.video;
   if (!cfg?.api_key) {
-    throw new Error('No video provider configured. Set video.api_key (provider=doubao) in config, or OVS_VIDEO_* env vars.');
+    throw new Error('No video provider configured. Set video.api_key (provider=doubao or provider=atlas) in config, or OVS_VIDEO_* env vars.');
   }
   const now = opts.now ?? Date.now;
   const interval = opts.pollIntervalMs ?? POLL_INTERVAL_MS;
@@ -241,7 +245,9 @@ export async function generateVideo(params: VideoParams, config: OvsConfig = loa
       return { output: resolve(params.output), bytes: buf.byteLength, task_id: id };
     }
     if (status === 'failed' || status === 'canceled') {
-      throw new Error(`video: task ${id} ${status}`);
+      // The provider already said WHY; a refusal must carry that detail.
+      const detail = provider === 'atlas' ? atlasPoll?.error : doubaoPoll?.error?.message;
+      throw new Error(`video: task ${id} ${status}${detail ? `: ${detail}` : ''}`);
     }
     await sleep(interval);
   }
diff --git a/packages/tools/test/gen.test.ts b/packages/tools/test/gen.test.ts
index 70caa75..70619e3 100644
--- a/packages/tools/test/gen.test.ts
+++ b/packages/tools/test/gen.test.ts
@@ -323,6 +323,38 @@ describe('generateVideo (Doubao Seedance task + poll)', () => {
   });
 });
 
+describe('generateVideo provider errors', () => {
+  it('names both providers when none is configured', async () => {
+    await expect(generateVideo({ prompt: 'x', output: join(dir, 'none.mp4') }, {}))
+      .rejects.toThrow(/provider=doubao or provider=atlas/);
+  });
+
+  it('carries Doubao\'s failure detail instead of a bare "failed"', async () => {
+    const srv = await startServer((req, res) => {
+      const url = req.url ?? '';
+      if (req.method === 'POST' && url === '/contents/generations/tasks') {
+        res.writeHead(200, { 'content-type': 'application/json' });
+        res.end(JSON.stringify({ id: 't9' }));
+      } else if (req.method === 'GET' && url === '/contents/generations/tasks/t9') {
+        res.writeHead(200, { 'content-type': 'application/json' });
+        res.end(JSON.stringify({ status: 'failed', error: { message: 'quota exceeded' } }));
+      } else {
+        res.writeHead(404);
+        res.end();
+      }
+    });
+    try {
+      await expect(generateVideo(
+        { prompt: 'a dog', output: join(dir, 'never2.mp4') },
+        { video: { provider: 'doubao', base_url: srv.baseUrl, api_key: 'sk' } },
+        { pollIntervalMs: 1 },
+      )).rejects.toThrow(/failed: quota exceeded/);
+    } finally {
+      await srv.close();
+    }
+  });
+});
+
 describe('generateVideo (Atlas Cloud task + poll)', () => {
   it('defaults the model by task type: image-to-video when a first frame is passed', () => {
     const req = buildAtlasCreateRequest(
@@ -352,6 +384,43 @@ describe('generateVideo (Atlas Cloud task + poll)', () => {
     expect(req.body).not.toHaveProperty('image');
   });
 
+  it('accepts the Atlas-only knobs: duration -1, adaptive ratio, SR resolutions', () => {
+    const req = buildAtlasCreateRequest(
+      { provider: 'atlas', api_key: 'atlas-key' },
+      { prompt: 'a sunrise', output: 'out.mp4', duration: -1, ratio: 'adaptive', resolution: '1080p-SR' },
+    );
+    expect(req.body).toMatchObject({ duration: -1, ratio: 'adaptive', resolution: '1080p-SR' });
+    expect(() => buildAtlasCreateRequest(
+      { provider: 'atlas', api_key: 'atlas-key' },
+      { prompt: 'a sunrise', output: 'out.mp4', duration: 3 },
+    )).toThrow(/between 4 and 15 seconds, or -1/);
+  });
+
+  it('carries the provider\'s failure detail instead of a bare "failed"', async () => {
+    const srv = await startServer((req, res) => {
+      const url = req.url ?? '';
+      if (req.method === 'POST' && url === '/model/generateVideo') {
+        res.writeHead(200, { 'content-type': 'application/json' });
+        res.end(JSON.stringify({ code: 200, data: { id: 'atlas-9', status: 'starting' } }));
+      } else if (req.method === 'GET' && url === '/model/prediction/atlas-9') {
+        res.writeHead(200, { 'content-type': 'application/json' });
+        res.end(JSON.stringify({ code: 200, data: { id: 'atlas-9', status: 'failed', error: 'content policy violation' } }));
+      } else {
+        res.writeHead(404);
+        res.end();
+      }
+    });
+    try {
+      await expect(generateVideo(
+        { prompt: 'a sunrise', output: join(dir, 'never.mp4') },
+        { video: { provider: 'atlas', base_url: srv.baseUrl, api_key: 'atlas-key' } },
+        { pollIntervalMs: 1 },
+      )).rejects.toThrow(/failed: content policy violation/);
+    } finally {
+      await srv.close();
+    }
+  });
+
   it('fails closed on an explicit model/task mismatch instead of shipping the wrong video', () => {
     expect(() => buildAtlasCreateRequest(
       { provider: 'atlas', api_key: 'atlas-key', model: 'bytedance/seedance-2.0/text-to-video' },