add-setting-env

add-setting-env is a codebase-workflow skill for the LobeHub project that guides an agent through adding a server-side environment variable to control the default value of a user setting. It solves the problem of correctly threading a new configuration value through LobeHub's layered settings architecture, where the resolution priority is User Custom > Server Env Var > Hardcoded Default.

The skill lays out a six-step process with concrete TypeScript snippets: defining the env var with `@t3-oss/env-core` and a Zod schema in `packages/env/src/<domain>.ts`, extending the `GlobalServerConfig` type (reusing existing types where possible), assembling the server config in `apps/server/src/globalConfig/index.ts`, merging it into the user store slice, updating `.env.example`, and updating the English and Chinese environment-variable docs. It includes a worked example using `AI_IMAGE_DEFAULT_IMAGE_NUM` showing each edit in context.

It targets LobeHub contributors and maintainers working on configuration and settings, and TypeScript developers extending the app's server config. This is a benign development helper: it edits typed source files and documentation and uses standard Zod validation for env vars, with no code execution, credential handling beyond ordinary config wiring, or destructive behavior.