“Tool failed” is not an error message. It is a debugging tax. When an AI agent queries a database through MCP, failures need to be structured enough for the agent to recover and specific enough for humans to audit. A database tool can fail because: Those should not all collapse into the same generic error. A useful MCP database error explains: Longer version: MCP tool errors for AI database agents The happy path demos well. The unhappy path is what makes the system operable.
Google Gemini 3.7 Flash Goes GA Across AI Mode, APIs, and Enterprise Surfaces