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.teamai/skills/common/golang-project-layout/references/config.md

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+# Application Configuration with Cobra + Viper
+
+→ See `samber/cc-skills-golang@golang-cli` skill for complete Cobra+Viper setup, flag binding, precedence rules, and configuration layering.
+
+## Where Config Lives
+
+```
+myapp/
+├── cmd/myapp/
+│   ├── main.go                # Entry point
+│   ├── root.go                # Root command + Viper init
+│   ├── serve.go               # Subcommand with flags
+│   └── config.go              # Config struct + loader
+└── configs/
+    └── config.yaml            # Default config file
+```
+
+## Config Struct
+
+Define configuration as a struct with `mapstructure` tags matching your YAML keys:
+
+```go
+// cmd/myapp/config.go
+package main
+
+import (
+    "fmt"
+
+    "github.com/spf13/viper"
+)
+
+type Config struct {
+    Port     int    `mapstructure:"port"`
+    Host     string `mapstructure:"host"`
+    LogLevel string `mapstructure:"log-level"`
+    Database struct {
+        DSN     string `mapstructure:"dsn"`
+        MaxConn int    `mapstructure:"max-conn"`
+    } `mapstructure:"database"`
+}
+
+func loadConfig() (Config, error) {
+    var cfg Config
+    if err := viper.Unmarshal(&cfg); err != nil {
+        return Config{}, fmt.Errorf("unmarshaling config: %w", err)
+    }
+    return cfg, nil
+}
+```
+
+Configuration MUST be loaded from env vars, files, or flags — NEVER hardcoded. Sensitive values MUST come from env vars or secret managers, NEVER config files.