list_tables returns null values and describe_table fails with "table does not exist" for valid tables

[maMykola]

When using the MySQL MCP server, the list_tables and describe_table tools return incorrect results, even though the underlying database connection works correctly.

Environment

• Package: @executeautomation/database-server (latest via npx -y)
• Database: MySQL 8.0 (AWS RDS)
• Claude Code: 2.0.54

Steps to Reproduce

1. Configure the MCP server with valid MySQL credentials
2. Verify connection works with read_query:

SELECT 1 AS test;  -- Returns: [{"test": 1}] ✓

3. Call list_tables tool
4. Call describe_table with a valid table name (e.g., user)

Expected Behavior

• list_tables should return an array of table names
• describe_table should return column definitions for existing tables

Actual Behavior

list_tables:
Returns an array of null values matching the table count (748 tables → 748 nulls):
[null, null, null, null, ...]

describe_table:
Returns error for tables that definitely exist:
{"error": "Error describing table: Table 'user' does not exist"}

Workaround

Direct SQL queries against information_schema work correctly:
-- list_tables workaround

SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE();

-- describe_table workaround

SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_KEY
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'user';

Suspected Cause

• list_tables: Result row parsing issue - possibly accessing wrong property from SHOW TABLES result format
• describe_table: Missing database qualification or incorrect empty result check