Prerequisites

• I've searched the current open issues
• I've updated to the latest version of Toolbox

Toolbox version

Gemini CLI version 0.7.0.

Environment

1. OS type and version: root:xnu-11417.140.69.701.11~1/RELEASE_ARM64_T6000 arm64)
2. How are you running Toolbox:

• Gemini CLI extension cloud-sql-postgresql

Client

1. Client: Gemini CLI
2. Version: Version 0.7.0.

Expected Behavior

If Gemini CLI calls an Execute SQL tools for a database user that doesn't have the required database permissions, then a specific error is shown the user. The tool call shouldn't fail silently.

Current Behavior

I tried grant and select queries using an IAM user.
When I try to grant permissions, the Execute SQL tool fails silently because I didn't have the necessary permissions for the grant.
When I try to query a table, the ExecuteSQL tool fails silent because I didn't have the necessary permissions for the SELECT. It also gives a misleading response like the following.
" The execute_sql tool that I use to query the database does not return the data to me. It only tells me if the query was successful or not. Therefore, I can't see the data and can't show it to you. I can only see the schema of the table, like column names and data types."

Steps to reproduce?

1. Add an IAM user in the environment variables. This IAM user shouldn't have the DB permissions.
2. Ask Gemini CLI to grant DB permission to this user
3. Ask Gemini CLI to query a table created by another user
   ...

Additional Details

No response