relational-database-mcp-cloudbase

Activation Contract

Use this first when

• The agent must inspect SQL data, execute SQL statements, provision or destroy MySQL, initialize table structure, or manage table security rules through MCP tools.

Read before writing code if

• The task includes querySqlDatabase, manageSqlDatabase, readSecurityRule, or writeSecurityRule.

Then also read

• Web application integration -> ../relational-database-web/SKILL.md
• Raw HTTP database access -> ../http-api/SKILL.md

Do NOT use for

• Frontend or backend application code that should use SDKs instead of MCP operations.

Common mistakes / gotchas

• Initializing SDKs in an MCP management flow.
• Running write SQL or DDL before checking whether MySQL is provisioned and ready.
• Treating document database tasks as MySQL management tasks.
• Skipping _openid and security-rule review after creating new SQL tables.
• Destroying MySQL without explicit confirmation or without checking whether the environment still needs the instance.

When to use this skill

Use this skill when an agent needs to operate on CloudBase Relational Database via MCP tools, for example:

• Inspecting or querying SQL data
• Provisioning MySQL for an environment
• Destroying MySQL for an environment
• Polling MySQL provisioning status
• Modifying data or schema (INSERT/UPDATE/DELETE/DDL)
• Initializing tables and indexes after MySQL is ready
• Reading or changing table security rules

Do NOT use this skill for:

• Building Web or Node.js applications that talk to CloudBase Relational Database directly through SDKs
• Auth flows or user identity management

How to use this skill (for a coding agent)

1. Recognize MCP context

   • If you can call tools like querySqlDatabase, manageSqlDatabase, readSecurityRule, writeSecurityRule, you are in MCP context.
   • In this context, never initialize SDKs for CloudBase Relational Database; use MCP tools instead.

2. Pick the right tool for the job

   • Read-only SQL and provisioning status checks -> querySqlDatabase
   • MySQL provisioning, MySQL destruction, write SQL, DDL, schema initialization -> manageSqlDatabase
   • Inspect rules -> readSecurityRule
   • Change rules -> writeSecurityRule

3. Always be explicit about safety

   • Before destructive operations (DELETE, DROP, etc.), summarize what you are about to run and why.
   • Prefer querySqlDatabase(action="getInstanceInfo") or a read-only SQL check before writes.
   • Provisioning or destroying MySQL requires explicit confirmation because both actions have environment-level impact.

Available MCP tools (CloudBase Relational Database)

These tools are the supported way to interact with CloudBase Relational Database via MCP:

1. querySqlDatabase

• Purpose: Query SQL data and provisioning state.
• Use for:
  • Running SELECT and other read-only SQL queries with action="runQuery"
  • Checking whether MySQL already exists with action="getInstanceInfo"
  • Inspecting asynchronous provisioning progress with action="describeCreateResult" or action="describeTaskStatus"

Example flow:

{
  "action": "runQuery",
  "sql": "SELECT id, email FROM users ORDER BY created_at DESC LIMIT 50"
}

2. manageSqlDatabase

• Purpose: Manage SQL lifecycle and execute mutating SQL.
• Use for:
  • Provisioning MySQL with action="provisionMySQL"
  • Destroying MySQL with action="destroyMySQL"
  • Executing INSERT, UPDATE, DELETE, CREATE TABLE, ALTER TABLE, DROP TABLE with action="runStatement"
  • Initializing tables and indexes with action="initializeSchema"

Important: When creating a new table, you must include the _openid column for per-user access control:

_openid VARCHAR(64) DEFAULT '' NOT NULL

Note: when a user is logged in, _openid is automatically populated by the server from the authenticated session. Do not manually fill it in normal inserts.

Before calling this tool, confirm:

• The current environment has a ready MySQL instance, or you have just provisioned one.
• The target tables and conditions are correct.
• You have run a corresponding read-only query when appropriate.

When destroying MySQL, confirm:

• The current environment really should lose the SQL instance.
• You have explicit confirmation for the destructive action.
• You are prepared to query describeTaskStatus afterward to inspect the destroy result.

3. readSecurityRule

• Purpose: Read security rules for a given SQL table.
• Use for:
  • Understanding who can read/write a table
  • Auditing permissions on sensitive tables

4. writeSecurityRule

• Purpose: Set or update security rules for a given SQL table.
• Use for:
  • Hardening access to sensitive data
  • Opening up read access while restricting writes
  • Applying custom rules when needed

Recommended lifecycle flow

Scenario 1: MySQL is not provisioned yet

1. Call querySqlDatabase(action="getInstanceInfo").
2. If no instance exists, call manageSqlDatabase(action="provisionMySQL", confirm=true).
3. Poll provisioning status with:
   • querySqlDatabase(action="describeCreateResult")
   • querySqlDatabase(action="describeTaskStatus")
4. Only continue when the returned lifecycle status is READY.
5. For MySQL provisioning, prefer describeCreateResult; reserve describeTaskStatus for destroy flows whose task response carries TaskName.

Scenario 2: Safely inspect data in a table

1. Use querySqlDatabase(action="runQuery") with a limited SELECT.
2. Include LIMIT and relevant filters.
3. Review the result set and confirm it matches expectations before any write operation.

Scenario 3: Apply schema initialization after provisioning

1. Confirm MySQL is ready.
2. Prepare ordered DDL statements.
3. Run them through manageSqlDatabase(action="initializeSchema").
4. After creating tables, verify security rules with readSecurityRule or writeSecurityRule.

Scenario 4: Execute a targeted write or DDL change

1. Use querySqlDatabase(action="runQuery") to inspect current data or schema if needed.
2. Run the mutation once with manageSqlDatabase(action="runStatement").
3. Validate with another read-only query or by checking security rules.

Scenario 5: Destroy MySQL when the environment no longer needs it

1. Use querySqlDatabase(action="getInstanceInfo") to confirm the current environment still has a SQL instance.
2. Call manageSqlDatabase(action="destroyMySQL", confirm=true).
3. Query querySqlDatabase(action="describeTaskStatus") until the destroy task completes or fails.
4. If the task succeeds, optionally call querySqlDatabase(action="getInstanceInfo") to confirm the instance no longer exists.
5. If the task fails, treat the returned error as the terminal result and let the caller decide whether to retry.

Key principle: MCP tools vs SDKs

• MCP tools are for agent operations and database management:

  • Provision MySQL.
  • Destroy MySQL.
  • Poll lifecycle state.
  • Run ad-hoc SQL.
  • Inspect and change security rules.
  • Do not depend on application auth state.

• SDKs are for application code:

  • Frontend Web apps -> Web Relational Database skill.
  • Backend Node apps -> Node Relational Database quickstart.

When working as an MCP agent, always prefer these MCP tools for CloudBase Relational Database, and avoid mixing them with SDK initialization in the same flow.