ai-model-nodejs

name	ai-model-nodejs
description	Use this skill for Node.js backend AI via @cloudbase/node-sdk (>=3.16.0) — cloud functions, CloudRun, Express, Koa, NestJS, serverless APIs, scheduled jobs, LLM proxies. Only SDK supporting image generation (ai.createImageModel + generateImage). Text models via ai.createModel with groups cloudbase, hunyuan-exp, or custom-*. Model IDs (deepseek-v4-flash, deepseek-v3.2, hunyuan-2.0-instruct-20251111, glm-5, kimi-k2.6) go in the model field of generateText/streamText. MUST run two-step preflight before code — see body. Keywords: backend, 云函数, 云托管, serverless, LLM proxy, agent orchestration, generateText, streamText, generateImage, createModel, hunyuan-image, Token Credits, TokenHub, Hunyuan, DeepSeek, GLM, Kimi, MiniMax. NOT for browser/Web (use ai-model-web) or Mini Program (use ai-model-wechat).
version	2.20.2
alwaysApply	false

Standalone Install Note

If this environment only installed the current skill, start from the CloudBase main entry and use the published cloudbase/references/... paths for sibling skills.

• CloudBase main entry: https://cnb.cool/tencent/cloud/cloudbase/cloudbase-skills/-/git/raw/main/skills/cloudbase/SKILL.md
• Current skill raw source: https://cnb.cool/tencent/cloud/cloudbase/cloudbase-skills/-/git/raw/main/skills/cloudbase/references/ai-model-nodejs/SKILL.md

Keep local references/... paths for files that ship with the current skill directory. When this file points to a sibling skill such as auth-tool or web-development, use the standalone fallback URL shown next to that reference.

When to use this skill

Use this skill for calling AI models from Node.js backends, cloud functions, or CloudRun services via @cloudbase/node-sdk.

🧭 Runtime-plane fit. This is the right skill when the AI call truly belongs on the server: image generation (the only SDK that supports it), long-running agent jobs, orchestration across multiple tools, scheduled tasks, or flows that must keep secrets server-side. If the user is building a Web page / frontend AI chat UI, do NOT wrap this SDK behind a backend proxy — route to ai-model-web and call the model directly from the browser. For WeChat Mini Programs use ai-model-wechat. Routing is decided by runtime plane first; the concrete model (deepseek-*, glm-*, hunyuan-*, kimi-*, …) only affects the model field.

Use it when you need to:

• Integrate AI text generation into a backend service
• Generate images with the Hunyuan Image model
• Call AI models from CloudBase cloud functions or CloudRun
• Do server-side AI processing (agent orchestration, batch jobs, scheduled tasks)

Do NOT use for:

• Browser/Web apps → use the ai-model-web skill
• WeChat Mini Program → use the ai-model-wechat skill
• Runtimes without a CloudBase SDK (Python, Go, PHP, curl, etc.) → use the http-api skill (it now includes the ai_model OpenAPI spec for direct HTTP calls to the AI model endpoint; do NOT wrap this SDK behind an HTTP proxy)

---

⛔ STOP — ai.createModel(...) argument is not a vendor / model name

Read this before writing any createModel(...) line. Agents frequently hallucinate this argument. There are exactly three legal shapes. Anything else is a bug.

✅ Legal ai.createModel(...) argument	When to use it
"cloudbase"	The main managed group for server-side projects (TokenHub-backed, multi-vendor pool). Vendor + concrete model go into the model field of generateText / streamText, e.g. { model: "deepseek-v4-flash" }. No model is enabled by default — always check DescribeAIModels first and, if the target model is missing, enable it with UpdateAIModel before calling the SDK.
"hunyuan-exp"	Only if DescribeAIModels explicitly returns this legacy builtin group for the current env.
"custom-<your-name>"	A user-defined GroupName you onboarded via CreateAIModel. Must start with custom- (e.g. custom-kimi, custom-openai-compat).

Image generation is a separate entry point: ai.createImageModel("hunyuan-image"). Do not mix it with createModel(...).

❌ Do NOT write any of these — they are all wrong

ai.createModel("deepseek")                 // wrong — that's a vendor, not a GroupName
ai.createModel("deepseek-v4-flash")        // wrong — model id goes in the `model` field
ai.createModel("hunyuan") / "hunyuan-2.0-instruct-20251111"  // wrong — vendor / model name
ai.createModel("glm") / "kimi" / "minimax"  // wrong — vendor names
ai.createModel("openai") / "moonshot"       // wrong — vendor names
ai.createModel("custom")                   // wrong — placeholder; use your real custom-<name>
ai.createModel(modelName)                  // wrong — do not reuse the variable that holds the model id

✅ Correct pattern — GroupName vs Model are two different fields

const model = ai.createModel("cloudbase");          // ← GroupName
await model.generateText({
  model: "deepseek-v4-flash",                       // ← concrete model id
  messages: [...]
});

Decision procedure (when the user names a specific model)

1. The user says "use DeepSeek v3.2" / "use hunyuan instruct" / "use Kimi k2.6" / "use GLM-5" / …
2. createModel("cloudbase") stays the same.
3. Put the model id into the model field: { model: "deepseek-v3.2" }, { model: "hunyuan-2.0-instruct-20251111" }, { model: "kimi-k2.6" }, { model: "glm-5" }, …
4. Never assume the model is already enabled. Before calling the SDK, verify it is present in DescribeAIModels({ GroupName: "cloudbase" }).Models[]. If missing, call DescribeManagedAIModelList to confirm the exact Model name the platform supports (case-sensitive — do not guess the spelling) and then enable it via UpdateAIModel with Status: 1 (remember Models is a full replacement).

If you are about to type ai.createModel( and the thing inside the parentheses is a vendor name, a model name, or a guess — stop. It is almost certainly one of the three legal values above.

---

Mandatory Two-Step Preflight (before any SDK code)

Before calling any AI API on the server, run the two-step preflight: ① eligibility, ② group readiness. Text generation and image generation draw from the same Token Credits resource pack, and both must complete the preflight before code is emitted.

Step 0: obtain the environment ID

Call the MCP tool envQuery with action=info and read EnvId from the response.

---

Preflight ① — Eligibility (Token Credits resource pack)

Call the MCP tool:

callCloudApi(service="tcb", action="DescribeEnvPostpayPackage", params={ EnvId })

Pass conditions (all required):

• envPostpayPackageInfoList contains at least one entry

• That entry's postpayPackageId starts with pkg_tcb_tokencredits_

• That entry's status is NOT in [3, 4] (3 / 4 typically mean expired / disabled; trust the live response)

• ❌ Not satisfied → stop writing code and surface this to the user (replacing {envId} with the real id):

  The current environment has no active Token Credits resource pack. Please purchase one before calling any AI API: https://buy.cloud.tencent.com/lowcode?buyType=resPack&envId={envId}&resourceType=token

  Let me know once it's done and I'll re-check the resource pack status.

• ✅ Satisfied → proceed to preflight ②.

Parameter casing is PascalCase by contract. If the call returns InvalidParameter, fall back to camelCase (envId) and trust the live response.

---

Preflight ② — Group readiness (DescribeAIModels → UpdateAIModel if needed)

Eligibility alone is not enough. Do not write createModel("cloudbase") yet. First confirm that the target GroupName exists in the env with Status=1, and that the target Model is present in its Models[].

1. List groups configured in the current env:

   callCloudApi(service="tcb", action="DescribeAIModels", params={ EnvId })
   

   Returns AIModelGroups: AIModelGroup[] with GroupName, Type (builtin / custom), Models: [{ Model, EnableMCP, Tags }], Status (1 / 2), BaseUrl, Secret, Remark. The main managed GroupName is cloudbase.

2. Never assume a model is already enabled. Inspect AIModelGroups[?].Models[].Model for the target group. If the text model you plan to use (e.g. deepseek-v4-flash, or whatever the user asked for) is missing from the cloudbase group's Models[], jump to step 4 and enable it — do not call createModel("cloudbase") yet. Image generation uses createImageModel("hunyuan-image") + model: "hunyuan-image"; verify it is likewise enabled before the call.

3. User asked for a model from the managed catalog (e.g. deepseek-v3.2, hunyuan-2.0-instruct-20251111): check whether that Model is already in the cloudbase group's Models[]. If not, jump to step 4. Do not guess the exact model id — confirm the canonical spelling in DescribeManagedAIModelList first.

4. Enable / add a managed model (always inspect the authoritative catalog + pricing first):

   callCloudApi(service="tcb", action="DescribeManagedAIModelList", params={ EnvId })
   

   Returns ManagedAIModelGroup[] with GroupName, Remark, and Models: [{ Model, EnableMCP, ModelSpec, ModelChargingInfo }]. This is the single source of truth for supported model names and pricing — do not infer them from memory. Use the exact Model string from here when calling UpdateAIModel. ModelChargingInfo includes input / output prices and billing unit. Surface the prices to the user before enabling.

   Then enable (note: Models is a full replacement — always resend the already-enabled models together with the new one):

   callCloudApi(service="tcb", action="UpdateAIModel", params={
     EnvId,
     GroupName: "cloudbase",
     Models: [
       // resend every model that DescribeAIModels already showed as enabled
       { Model: "<already-enabled model>" },
       // append the newly-requested one, using the exact spelling from DescribeManagedAIModelList
       { Model: "<target model>" }
     ],
     Status: 1
   })
   

5. The requested model is not in the managed catalog (not found by DescribeManagedAIModelList) → jump to the next section, Custom onboarding (models outside the managed catalog).

All Actions use service=tcb, Version=2018-06-08. Parameters are PascalCase; fall back to camelCase only on InvalidParameter.

---

Available Providers and Models

ai.createModel(<GroupName>) accepts exactly three kinds of legal values; ai.createImageModel("hunyuan-image") is the dedicated image-generation entry point.

1. "cloudbase" — the main managed group (recommended)

• GroupName: "cloudbase", Type: "builtin", Remark: "腾讯云开发" (Tencent CloudBase)
• Backed by Tencent Cloud TokenHub, a unified managed pool covering multiple vendors — Hunyuan (HY 2.0 Instruct, HY 2.0 Think, Hunyuan-role, Hy3 preview, …), DeepSeek (DeepSeek-V4-Pro, DeepSeek-V4-Flash, Deepseek-v3.2, Deepseek-v3.1, Deepseek-r1-0528, Deepseek-v3-0324, …), Zhipu GLM (GLM-5, GLM-5-Turbo, GLM-5.1, GLM-5V-Turbo), Kimi (K2.5, K2.6), MiniMax (M2.5, M2.7), and more. The roster evolves — do not hard-code specific SKUs; discover at runtime
• No model is enabled by default. Always call DescribeAIModels first to see what the env has actually enabled; if your target model is missing, call DescribeManagedAIModelList for the authoritative catalog + pricing and then UpdateAIModel (Status: 1, Models full-replacement) to enable it before making the SDK call.
• Authoritative catalog + pricing: DescribeManagedAIModelList
• Env-enabled set: DescribeAIModels

2. "hunyuan-exp" — legacy builtin group (kept for compatibility)

• Default model: hunyuan-2.0-instruct-20251111; additional hunyuan SKUs must be discovered at runtime via DescribeAIModels({ GroupName: "hunyuan-exp" }).Models[] — do not hard-code other IDs
• Use it directly only if DescribeAIModels actually returns this group with Status=1. New projects should prefer cloudbase

3. User-defined GroupName

• Onboarded via CreateAIModel (see the next section). The custom GroupName MUST start with custom- (e.g. custom-kimi, custom-moonshot, custom-openai-compat). This naming convention prevents future collisions with built-in / vendor GroupNames (like cloudbase, hunyuan-exp, deepseek, glm, kimi, minimax) that the platform may introduce over time
• Examples: createModel("custom-kimi"), createModel("custom-openai-compat")

Image generation (independent API)

• ai.createImageModel("hunyuan-image") + model: "hunyuan-image". Only supported in the Node SDK

Never write guesses like createModel("deepseek") or createModel("custom") unless DescribeAIModels explicitly returned that exact GroupName.

---

Custom onboarding (models outside the managed catalog)

When the user wants a non-managed text model (self-hosted, enterprise-internal, third-party OpenAI-compatible endpoint, …), do not block. Guide them through onboarding:

Option 1: console flow (recommended, user handles it)

https://tcb.cloud.tencent.com/dev?envId={envId}#/ai

Option 2: programmatic onboarding (CreateAIModel)

callCloudApi(service="tcb", action="CreateAIModel", params={
  EnvId: "<envId>",
  GroupName: "custom-<your-name>",  // MUST start with "custom-" (e.g. custom-kimi, custom-openai-compat); never start with "cloudbase"
  BaseUrl: "<OpenAI-compatible endpoint, e.g. https://api.moonshot.cn/v1>",
  Models: [
    { Model: "<model name, e.g. kimi-k2.5>", EnableMCP: true }
  ],
  Remark: "<optional remark>",
  Status: 1,
  Secret: { ApiKey: "<vendor api key supplied by the user>" }
})

Once onboarded, confirm with DescribeAIModels that the group is ready, then call ai.createModel("<the GroupName you just registered>") from your code. Use UpdateAIModel to add/remove models, rotate keys, or change BaseUrl (remember Models is a full replacement). Use DeleteAIModel to remove a custom group (builtin groups cannot be deleted).

Custom-model billing is covered by the third-party provider and does not draw from the Token Credits resource pack. Field casing follows the live contract — fall back to camelCase on InvalidParameter.

---

Installation

npm install @cloudbase/node-sdk

⚠️ The AI feature requires version 3.16.0 or above. Check with npm list @cloudbase/node-sdk.

---

Initialization

Inside a CloudBase cloud function

const tcb = require('@cloudbase/node-sdk');
const app = tcb.init({ env: '<YOUR_ENV_ID>' });

exports.main = async (event, context) => {
  const ai = app.ai();
  // Use AI features
};

Cloud function configuration for AI models

⚠️ Important: when creating cloud functions that use AI models (especially generateImage() and large text generation), set a longer timeout — these operations can be slow.

Using the MCP tool manageFunctions(action="createFunction"):

Legacy compatibility: if an older prompt still says createFunction, keep the same payload shape but execute it through manageFunctions(action="createFunction").

Set timeout inside the func object:

• Parameter: func.timeout (number)
• Unit: seconds
• Range: 1 – 900
• Default: 20 seconds (usually too short for AI operations)

Recommended timeouts:

• Text generation (generateText): 60 – 120 s
• Streaming (streamText): 60 – 120 s
• Image generation (generateImage): 300 – 900 s (recommended: 900 s)
• Combined operations: 900 s (maximum allowed)

In a regular Node.js server

const tcb = require('@cloudbase/node-sdk');
const app = tcb.init({
  env: '<YOUR_ENV_ID>',
  secretId: '<YOUR_SECRET_ID>',
  secretKey: '<YOUR_SECRET_KEY>'
});

const ai = app.ai();

---

generateText() — non-streaming

Prerequisite: the two-step preflight (eligibility + group readiness) has passed. The example below assumes the user did not specify a model, so it uses the cloudbase managed group + deepseek-v4-flash.

const model = ai.createModel("cloudbase");

const result = await model.generateText({
  model: "deepseek-v4-flash",  // must already be enabled in this env (DescribeAIModels → UpdateAIModel)
  messages: [{ role: "user", content: "Give me a one-paragraph intro to Li Bai." }],
});

console.log(result.text);           // generated text string
console.log(result.usage);          // { prompt_tokens, completion_tokens, total_tokens }
console.log(result.messages);       // full message history
console.log(result.rawResponses);   // raw model responses

---

Error Handling Pattern

const model = ai.createModel("cloudbase");

try {
  const result = await model.generateText({
    model: "deepseek-v4-flash",
    messages: [{ role: "user", content: "Summarize today's deployment logs." }],
  });

  console.log(result.text);
} catch (error) {
  console.error("AI request failed", error);
}

---

streamText() — streaming

Prerequisite: the two-step preflight has passed.

const model = ai.createModel("cloudbase");

const res = await model.streamText({
  model: "deepseek-v4-flash",
  messages: [{ role: "user", content: "Give me a one-paragraph intro to Li Bai." }],
});

// Option 1: iterate the text stream (recommended)
for await (let text of res.textStream) {
  console.log(text);  // incremental text chunks
}

// Option 2: iterate the data stream for full response chunks
for await (let data of res.dataStream) {
  console.log(data);  // full response chunk with metadata
}

// Option 3: access final results
const messages = await res.messages;  // full message history
const usage = await res.usage;        // token usage

---

generateImage() — image generation

⚠️ Image generation is only available in the Node SDK, not in the JS SDK (Web) or WeChat Mini Program.

⚠️ Image generation also consumes the Token Credits resource pack, so the two-step preflight must pass before calling it. Per-call cost is higher than text and calls take longer (set cloud function timeout to 900 s).

const imageModel = ai.createImageModel("hunyuan-image");

const res = await imageModel.generateImage({
  model: "hunyuan-image",
  prompt: "A cute kitten playing on the grass",
  size: "1024x1024",
  version: "v1.9",
});

console.log(res.data[0].url);           // image URL (valid for 24 hours)
console.log(res.data[0].revised_prompt);// revised prompt when revise=true

Image Generation Parameters

interface HunyuanGenerateImageInput {
  model: "hunyuan-image";      // required
  prompt: string;                       // required: image description
  version?: "v1.8.1" | "v1.9";         // default: "v1.8.1"
  size?: string;                        // default: "1024x1024"
  negative_prompt?: string;             // v1.9 only
  style?: string;                       // v1.9 only
  revise?: boolean;                     // default: true
  n?: number;                           // default: 1
  footnote?: string;                    // watermark, max 16 chars
  seed?: number;                        // range: [1, 4294967295]
}

interface HunyuanGenerateImageOutput {
  id: string;
  created: number;
  data: Array<{
    url: string;                        // image URL (24h valid)
    revised_prompt?: string;
  }>;
}

---

Type Definitions

interface BaseChatModelInput {
  model: string;                        // required: model name
  messages: Array<ChatModelMessage>;    // required: message array
  temperature?: number;                 // optional: sampling temperature
  topP?: number;                        // optional: nucleus sampling
}

type ChatModelMessage =
  | { role: "user"; content: string }
  | { role: "system"; content: string }
  | { role: "assistant"; content: string };

interface GenerateTextResult {
  text: string;                         // generated text
  messages: Array<ChatModelMessage>;    // full message history
  usage: Usage;                         // token usage
  rawResponses: Array<unknown>;         // raw model responses
  error?: unknown;                      // error if any
}

interface StreamTextResult {
  textStream: AsyncIterable<string>;    // incremental text stream
  dataStream: AsyncIterable<DataChunk>; // full data stream
  messages: Promise<ChatModelMessage[]>;// final message history
  usage: Promise<Usage>;                // final token usage
  error?: unknown;                      // error if any
}

interface Usage {
  prompt_tokens: number;
  completion_tokens: number;
  total_tokens: number;
}

---

Best Practices

1. Run the two-step preflight before writing business code — ① eligibility: envQuery → callCloudApi(tcb, DescribeEnvPostpayPackage) to confirm the Token Credits resource pack (text + image share the same pack); ② group readiness: DescribeAIModels for the cloudbase group and its Models[], DescribeManagedAIModelList for the authoritative supported-model catalog, UpdateAIModel with a full-replacement Models[] + Status: 1 when the target model is missing. If the pack is missing, return the purchase link https://buy.cloud.tencent.com/lowcode?buyType=resPack&envId={envId}&resourceType=token instead of emitting SDK code and letting the user debug runtime errors.
2. Never assume any model is already enabled — not deepseek-v4-flash, not hunyuan-image, not anything. Always verify with DescribeAIModels first; if the target is missing, look up the exact Model string in DescribeManagedAIModelList (do not guess the spelling) and then UpdateAIModel to enable it.
3. createModel accepts exactly three kinds of values — "cloudbase" (the main managed group), "hunyuan-exp" (legacy builtin), or a user-defined GroupName registered via CreateAIModel (MUST start with custom-, e.g. custom-kimi, custom-openai-compat). Never guess with createModel("deepseek") / createModel("kimi") / createModel("custom") — the first two are vendor/model names, the last is a placeholder. createImageModel("hunyuan-image") is a separate image API — keep it as-is.
4. Do not invent SDK method names or parameters. This SKILL.md is the authoritative reference for @cloudbase/node-sdk's AI surface — look up the method signature here (or in the Type Definitions section) before writing code. If a method or field is not documented here, stop and ask, or check the live contract via the MCP tools. No guessing.
5. Show pricing before enabling a new managed model — DescribeManagedAIModelList returns ModelSpec (context length, max input/output tokens) + ModelChargingInfo (input / output / cache prices, billing unit). Show the prices to the user before calling UpdateAIModel.
6. Plan timeout and quota separately for image generation — generateImage costs more per call than text and takes longer. For cloud functions, set timeout to 900s. HTTP-function gateways cap at 60s, so use an async-task + polling pattern. Throttle per-user concurrency and frequency to avoid burning an entire Token pack on one failure.
7. Prefer streaming for long-form interactions — in HTTP-function or cloud-function SSE scenarios, use streamText + for await (const chunk of result.textStream) to flush chunks back to the client incrementally. Handle stream interruption in catch and close the underlying response.
8. Pin @cloudbase/node-sdk >= 3.16.0 on the server — image generation is only available from this version. Verify with npm ls @cloudbase/node-sdk to confirm the version actually loaded by the cloud function / cloud run runtime — local and production can drift.
9. Centralize model names in config, not scattered literals. Keep the chosen text / image model in a single constant and source from DescribeAIModels / DescribeManagedAIModelList. The managed catalog evolves; a single source of truth makes upgrades cheap. For models outside the managed catalog, follow the Custom Onboarding section — never hard-code third-party API keys in business code (let CreateAIModel.Secret.ApiKey hold them via CloudBase).
10. Distinguish "preflight failure" from "model call failure" — the former means the resource pack is not active or the target model has not been enabled via UpdateAIModel (guide the user to purchase / enable). The latter is a parameter issue or upstream error. Do not wrap both in one generic toast.
11. Do not log full prompts or generated text in production — log only usage.total_tokens and a short prefix. Prompts can leak sensitive content; token counts can leak cost signals.
12. TypeScript: do NOT use any to silence SDK type errors. The Node SDK ships its own types; narrow with unknown + a type guard, write a precise interface for the shape you consume, or augment types in a local .d.ts. Never : any, as any, @ts-ignore, @ts-nocheck. See the Engineering constitution in the web-development skill — it applies to backend TS too.
13. Self-verify before claiming done. tsc --noEmit + project build + actually invoke the function (local invoke / manageFunctions(action="invokeFunction") / direct HTTP hit) and confirm usage.total_tokens > 0 and the returned text is not an error envelope. "It should work" without a real round-trip is not acceptable evidence.