db_add_database · Custom MCP Database Server MCP

WHAT IT DOES

What db_add_database does on Custom MCP Database Server

AI agents use db_add_database to create or update resources in Custom MCP Database Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Custom MCP Database Server environment.

WHY IT NEEDS A POLICY

Why db_add_database needs a policy

The tool modifies the middleware's stored database configuration by adding a new database connection without irreversibly destroying data. This qualifies as Write (creates/registers data reversibly) rather than Execute (which would require runtime code execution). Severity is medium because misconfiguration could grant unintended database access, but the action itself is reversible by removing the alias.

From the tool's definition Tool name 'db_add_database' indicates a data modification operation that creates or registers a new database connection/alias in the middleware control plane.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

db_add_database Rate-limited

db_add_database stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "db_add_database": {
      "limits": [
        {
          "counter": "db_add_database_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Custom MCP Database Server, so you can run agents against it safely.

FAQ

Questions about db_add_database

What does the db_add_database tool do? +

db_add_database. It is categorised as a Write tool in the Custom MCP Database Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on db_add_database? +

Register the Custom MCP Database Server MCP server in PolicyLayer and add a rule for db_add_database: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Custom MCP Database Server. Nothing to install.

What risk level is db_add_database? +

db_add_database is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit db_add_database? +

Yes. Add a rate_limit block to the db_add_database rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block db_add_database completely? +

Set action: deny in the PolicyLayer policy for db_add_database. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides db_add_database? +

db_add_database is provided by the Custom MCP Database Server MCP server (renanlido/custom-mcp-database). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.