安装 Spanner 插件

从 Data Agent Kit 安装 spanner@data-agent-kit，配置 ADC 和 SPANNER_PROJECT 等实例信息，通过本地 spanner MCP 查询数据库。

gcloud auth application-default login
export SPANNER_PROJECT=YOUR_SPANNER_PROJECT
export SPANNER_INSTANCE=YOUR_SPANNER_INSTANCE
export SPANNER_DATABASE=YOUR_SPANNER_DATABASE

codex plugin marketplace add GoogleCloudPlatform/data-agent-kit
codex plugin add spanner@data-agent-kit
codex mcp list

# 可选：
# export SPANNER_DIALECT=postgresql
# codex plugin marketplace upgrade data-agent-kit

# 不要：
# /plugin install spanner@claude-plugins-official
# gemini extensions install https://github.com/gemini-cli-extensions/spanner
# plugin add spanner@claude-plugins-official
# plugin add alloydb@data-agent-kit
# plugin add dak@data-agent-kit-starter-pack-marketplace
# plugin add looker@data-agent-kit
# codex mcp login spanner
# command = "./PATH/TO/toolbox"