diff --git a/shortcuts/apps/apps_db_audit_list.go b/shortcuts/apps/apps_db_audit_list.go
index c3f40f459..8c6c6b071 100644
--- a/shortcuts/apps/apps_db_audit_list.go
+++ b/shortcuts/apps/apps_db_audit_list.go
@@ -40,7 +40,7 @@ var AppsDBAuditList = common.Shortcut{
 		{Name: "until", Desc: "filter: event at or before; same formats as --since"},
 		{Name: "page-size", Type: "int", Default: "20", Desc: "page size"},
 		{Name: "page-token", Desc: "pagination cursor from previous response"},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_audit_set.go b/shortcuts/apps/apps_db_audit_set.go
index 287640eb8..93f0d4f7e 100644
--- a/shortcuts/apps/apps_db_audit_set.go
+++ b/shortcuts/apps/apps_db_audit_set.go
@@ -35,7 +35,7 @@ var AppsDBAuditEnable = common.Shortcut{
 		{Name: "app-id", Desc: "Miaoda app id", Required: true},
 		{Name: "table", Desc: "table to enable audit for", Required: true},
 		{Name: "retention", Default: "7d", Enum: auditRetentions, Desc: "how long to keep audit logs"},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
@@ -96,7 +96,7 @@ var AppsDBAuditDisable = common.Shortcut{
 	Flags: append([]common.Flag{
 		{Name: "app-id", Desc: "Miaoda app id", Required: true},
 		{Name: "table", Desc: "table to disable audit for", Required: true},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_audit_status.go b/shortcuts/apps/apps_db_audit_status.go
index 855100683..341e11bdb 100644
--- a/shortcuts/apps/apps_db_audit_status.go
+++ b/shortcuts/apps/apps_db_audit_status.go
@@ -30,7 +30,7 @@ var AppsDBAuditStatus = common.Shortcut{
 	Flags: append([]common.Flag{
 		{Name: "app-id", Desc: "Miaoda app id", Required: true},
 		{Name: "table", Desc: "show status for a single table (default: all configured tables)"},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_changelog_list.go b/shortcuts/apps/apps_db_changelog_list.go
index 1f013daa6..faf424e98 100644
--- a/shortcuts/apps/apps_db_changelog_list.go
+++ b/shortcuts/apps/apps_db_changelog_list.go
@@ -39,7 +39,7 @@ var AppsDBChangelogList = common.Shortcut{
 		{Name: "until", Desc: "filter: changed at or before; same formats as --since"},
 		{Name: "page-size", Type: "int", Default: "20", Desc: "page size"},
 		{Name: "page-token", Desc: "pagination cursor from previous response"},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_data_export.go b/shortcuts/apps/apps_db_data_export.go
index e4d98294b..a31712646 100644
--- a/shortcuts/apps/apps_db_data_export.go
+++ b/shortcuts/apps/apps_db_data_export.go
@@ -47,7 +47,7 @@ var AppsDBDataExport = common.Shortcut{
 		{Name: "table", Desc: "source table", Required: true},
 		{Name: "output", Desc: "local output path; extension picks format .csv/.json/.sql (default: <table>.csv)"},
 		{Name: "limit", Type: "int", Default: "5000", Desc: "max rows to export (1..5000)"},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "source db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "source db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_data_import.go b/shortcuts/apps/apps_db_data_import.go
index 1fe5cb18c..d3266eeb0 100644
--- a/shortcuts/apps/apps_db_data_import.go
+++ b/shortcuts/apps/apps_db_data_import.go
@@ -44,7 +44,7 @@ var AppsDBDataImport = common.Shortcut{
 		{Name: "app-id", Desc: "Miaoda app id", Required: true},
 		{Name: "file", Desc: "local data file (.csv/.json), relative to cwd", Required: true},
 		{Name: "table", Desc: "target table (default: file name without extension)"},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_execute.go b/shortcuts/apps/apps_db_execute.go
index f20acdd7a..2c38f7e88 100644
--- a/shortcuts/apps/apps_db_execute.go
+++ b/shortcuts/apps/apps_db_execute.go
@@ -66,7 +66,7 @@ var AppsDBExecute = common.Shortcut{
 		{Name: "sql", Desc: "SQL text; use - to read stdin. Mutually exclusive with --file",
 			Input: []string{common.Stdin}},
 		{Name: "file", Desc: "path to a .sql file (relative to cwd). Mutually exclusive with --sql"},
-	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use --environment online for the online environment)")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_quota_get.go b/shortcuts/apps/apps_db_quota_get.go
index c2e767f06..f5f1563be 100644
--- a/shortcuts/apps/apps_db_quota_get.go
+++ b/shortcuts/apps/apps_db_quota_get.go
@@ -29,7 +29,7 @@ var AppsDBQuotaGet = common.Shortcut{
 	HasFormat: true,
 	Flags: append([]common.Flag{
 		{Name: "app-id", Desc: "Miaoda app id", Required: true},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_table_get.go b/shortcuts/apps/apps_db_table_get.go
index 617d08b72..5aff1852d 100644
--- a/shortcuts/apps/apps_db_table_get.go
+++ b/shortcuts/apps/apps_db_table_get.go
@@ -37,7 +37,7 @@ var AppsDBTableGet = common.Shortcut{
 	Flags: append([]common.Flag{
 		{Name: "app-id", Desc: "app id", Required: true},
 		{Name: "table", Desc: "table name", Required: true},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/shortcuts/apps/apps_db_table_list.go b/shortcuts/apps/apps_db_table_list.go
index 68654928b..b24c04d83 100644
--- a/shortcuts/apps/apps_db_table_list.go
+++ b/shortcuts/apps/apps_db_table_list.go
@@ -42,7 +42,7 @@ var AppsDBTableList = common.Shortcut{
 		{Name: "app-id", Desc: "app id", Required: true},
 		{Name: "page-size", Type: "int", Default: "20", Desc: "page size"},
 		{Name: "page-token", Desc: "pagination cursor from previous response"},
-	}, dbEnvFlags("online", []string{"dev", "online"}, "target db environment")...),
+	}, dbEnvFlags("dev", []string{"dev", "online"}, "target db environment (default dev; use online for the online environment, or for an app whose DB is not multi-env)")...),
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
diff --git a/skills/lark-apps/references/lark-apps-db-execute.md b/skills/lark-apps/references/lark-apps-db-execute.md
index 601110922..c0baf815f 100644
--- a/skills/lark-apps/references/lark-apps-db-execute.md
+++ b/skills/lark-apps/references/lark-apps-db-execute.md
@@ -11,9 +11,9 @@
 - 必填：`--app-id`，以及 `--sql` / `--file` 二选一（互斥）。
 - `--sql`：内联 SQL 文本；传 `-` 时从 stdin 读。绝对路径文件经 stdin 传入：`--sql - < <absolute-path>`（shell 解析路径，CLI 仅接收内容）。
 - `--file`：`.sql` 文件路径，需为工作目录内的相对路径（如 `--file ./migration.sql`）；绝对路径、或经 `..`/符号链接越出工作目录的路径会被拒绝。文件不在工作目录内时，改用 `--sql - < <文件路径>` 经 stdin 传入。
-- `--environment` 枚举：`dev` / `online`，**默认 `dev`**；需要操作线上环境数据库时，显式指定 `--environment online`。旧名 `--env` 已**移除**：传入会报 validation 错（提示改用 `--environment`），一律用 `--environment`。
+- `--environment` 枚举：`dev` / `online`，**默认 `dev`**；操作线上库、或**未开启多环境的应用（其数据库在 `online`，没有 dev 分支）**时显式 `--environment online`。旧名 `--env` 已**移除**：传入会报 validation 错（提示改用 `--environment`），一律用 `--environment`。
 - risk 是 `high-risk-write`（SQL 可含 DML/DDL）：任何执行都需 `--yes`，否则返回 `confirmation_required` / exit 10。`--dry-run` 预览不需要 `--yes`。
-- CLI 永远传 `transactional=false`；不默认包事务。
+- **不会自动为你包事务，事务边界需自己在 SQL 里控制**：多语句默认逐条独立提交，中间某条失败时前序语句已生效、不会回滚；若需要「要么全部成功、要么全部回滚」的原子性，请在 SQL 内显式写 `BEGIN … COMMIT`（详见下「Agent 规则」）。
 
 ## 示例
 
diff --git a/skills/lark-apps/references/lark-apps-db.md b/skills/lark-apps/references/lark-apps-db.md
index abefd598f..f0e2d97ed 100644
--- a/skills/lark-apps/references/lark-apps-db.md
+++ b/skills/lark-apps/references/lark-apps-db.md
@@ -28,7 +28,7 @@
 
 ## 约定（先读）
 
-- **环境 `--environment dev|online`（默认 online；`+db-execute`/`+db-env-create` 默认 dev）**：看表、看结构、数据导入导出、变更追溯、审计、配额、初始化都按环境区分，写操作建议先在 `dev` 验。旧名 `--env` 已**移除**：传入会报 validation 错（提示改用 `--environment`），一律用 `--environment`。`+db-env-diff`/`+db-env-migrate` 是「dev→online 发布」语义、`+db-recovery-*` 作用于当前库，二者**没有** `--environment`。
+- **环境 `--environment dev|online`（所有 db 命令统一默认 `dev`）**：看表、看结构、数据导入导出、变更追溯、审计、配额都按环境区分，写操作建议先在 `dev` 验。**注意：只有开启了多环境（`+db-env-create`）的应用才有 `dev` 分支；未开启多环境的应用其数据库在 `online`——对这类应用必须显式 `--environment online`，否则默认的 `dev` 分支不存在、会报错**。旧名 `--env` 已**移除**：传入会报 validation 错（提示改用 `--environment`），一律用 `--environment`。`+db-env-diff`/`+db-env-migrate` 是「dev→online 发布」语义、`+db-recovery-*` 作用于当前库，二者**没有** `--environment`。
 - **本地文件用工作目录内相对路径**：导入 `--file ./orders.csv`、导出 `--output ./out.csv`；路径在别处先 `cd` 过去或改成相对路径。
 - **高危操作必须带 `--yes`**：`+db-env-create`、`+db-data-import`、`+db-env-migrate`、`+db-recovery-apply` 缺省会被确认关卡拦下；动手前先用对应的预览命令或 `--dry-run` 看清影响。
 - **时间参数按口语自然传**（`--since`/`--until`/`--target`），格式见末尾。