Connect to MySQL database
Risk signalsAccepts URL/endpoint input (host) · Handles credentials or secrets (password)
Part of the MySQL Database Server server.
Free to start. No card required.
AI agents use connect_db to create or modify resources in MySQL Database Server. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call connect_db repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach MySQL Database Server.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"connect_db": {
"limits": [
{
"counter": "connect_db_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full MySQL Database Server policy for all 7 tools.
These attack patterns abuse exactly the kind of access connect_db gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Connect to MySQL database. It is categorised as a Write tool in the MySQL Database Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MySQL Database Server MCP server in PolicyLayer and add a rule for connect_db: 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 MySQL Database Server. Nothing to install.
connect_db is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the connect_db 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.
Set action: deny in the PolicyLayer policy for connect_db. 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.
connect_db is provided by the MySQL Database Server MCP server (huangfeng19820712/mcp-mysql-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 MySQL Database Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.