auth-wechat-miniprogram

name	auth-wechat-miniprogram
description	CloudBase WeChat Mini Program native authentication guide. This skill should be used when users need mini program identity handling, OPENID/UNIONID access, or `wx.cloud` auth behavior in projects where login is native and automatic.
version	2.25.10
alwaysApply	false

Sibling skills (local only)

Sibling CloudBase skills ship beside this skill. Use local relative paths such as ../auth-tool-cloudbase/SKILL.md.

If a referenced sibling skill file is missing from this environment, ask the user to install the full CloudBase plugin (or the missing skill). Do not HTTP-fetch remote skill or protocol markdown into the agent context.

Activation Contract

Use this first when

• The task is about WeChat Mini Program auth behavior, wx.cloud identity, OPENID / UNIONID, or how a mini program caller is identified in CloudBase.
• The project is a CloudBase mini program and the auth question is about native mini program identity rather than provider configuration.

Read before writing code if

• The request mentions mini program login, user identity in cloud functions, or wx.cloud auth assumptions.
• The user expects a Web-style login page or explicit token exchange in a mini program; route them back to native mini program auth behavior.

Then also read

• Mini program project implementation -> ../miniprogram-development/SKILL.md
• Cloud function implementation -> ../cloud-functions/SKILL.md

Do NOT use for

• Web-based WeChat login or Web auth UI.
• Provider enable/disable or auth console setup.
• Generic Node-side auth flows outside mini program identity handling.

Common mistakes / gotchas

• Generating a Web-style login page for a wx.cloud mini program.
• Treating mini program auth as a provider-configuration problem.
• Forgetting that caller identity is injected in cloud functions automatically.

When to use this skill

Use this skill for WeChat Mini Program (小程序) authentication in a CloudBase project.

Use it when you need to:

• Implement identity-aware WeChat Mini Program flows with CloudBase
• Access user identity (openid, unionid) in cloud functions
• Understand how WeChat authentication integrates with CloudBase
• Build Mini Program features that require user identification

Key advantage: WeChat Mini Program authentication with CloudBase is seamless and automatic - no complex OAuth flows needed. When a Mini Program calls a cloud function, the user's openid is automatically injected and verified by WeChat.

Do NOT use for:

• Web-based WeChat login (use the auth-web skill)
• Server-side auth with Node SDK (use the auth-nodejs skill)
• Non-WeChat authentication methods (use appropriate auth skills)

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How to use this skill (for a coding agent)

1. Confirm CloudBase environment

   • Ask the user for:
     • env – CloudBase environment ID
     • Confirm the Mini Program is linked to the CloudBase environment

2. Understand the authentication flow

   • WeChat Mini Program authentication is native and automatic
   • No explicit login API calls needed in most cases
   • User identity is automatically available in cloud functions
   • CloudBase handles all authentication verification

3. Pick a scenario from this file

   • For basic user identity in cloud functions, use Scenario 2
   • For Mini Program initialization, use Scenario 1
   • For calling a cloud function from the Mini Program and receiving user identity, use Scenario 3
   • For testing authentication, use Scenario 4

4. Follow CloudBase API shapes exactly

   • Use wx-server-sdk in cloud functions
   • Use wx.cloud in Mini Program client code
   • Treat method names and parameter shapes in this file as canonical

5. If you're unsure about an API

   • Consult the official CloudBase Mini Program documentation
   • Only use methods that appear in official documentation

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Core concepts

How WeChat Mini Program authentication works with CloudBase

1. Automatic authentication:

   • When a Mini Program user calls a cloud function, WeChat automatically injects the user's identity
   • No need for complex OAuth flows or token management
   • CloudBase verifies the authenticity of the identity

2. User identifiers:

   • OPENID – Unique identifier for the user in this specific Mini Program
   • APPID – The Mini Program's App ID
   • UNIONID – (Optional) Unique identifier across all apps under the same WeChat Open Platform account
     • Only available when the Mini Program is bound to a WeChat Open Platform account
     • Useful for identifying the same user across multiple Mini Programs or Official Accounts

3. Security:

   • The openid, appid, and unionid are verified and trustworthy
   • WeChat has already completed authentication
   • Developers can directly use these identifiers without additional verification

4. No explicit login required:

   • Users are automatically authenticated when they use the Mini Program
   • No need to call login APIs in most cases
   • Identity is available immediately in cloud functions

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Extended guide

For detailed scenarios, examples, and patterns, read extended-guide.md.

Reference index

All packaged reference files (required for skill lint reachability):

• extended-guide.md