select_downloads_database_by_number

THE RISK

Medium Risk

Why select_downloads_database_by_number needs a policy

This tool selects/changes the active database connection from a list of previously browsed results. It modifies the server's active state (which database is in use), making it a Write operation rather than a pure Read. However, it doesn't create or destroy data — it changes configuration state.

From the tool's definition Select a database by its number from the Downloads browse results

Documented attack patterns abuse exactly the kind of access select_downloads_database_by_number gives an agent:

POLICY

How to control select_downloads_database_by_number

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Data Visualization Server, and nothing reaches the server without passing your rules. This is the rule we recommend for select_downloads_database_by_number:

policy.json

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

select_downloads_database_by_number 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.

Create a free account and register MCP Data Visualization Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More MCP Data Visualization Server tools

Execute query_data Execute a SQL query on the database and return results Write change_database Connect to a different DuckDB database file Write load_csv_data Load CSV file into the database as a new table Write configure_chart Configure chart parameters by answering column selection questions Write create_interactive_dashboard Generate an interactive HTML dashboard with filtering controls and multiple visualizations Write create_sample_chart Create a sample chart for testing (useful for development) Write create_visualization Start creating a data visualization from natural language request Write select_database_by_number Select a database by its number from the browse results

All 28 MCP Data Visualization Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about select_downloads_database_by_number

What does the select_downloads_database_by_number tool do? +

Select a database by its number from the Downloads browse results. It is categorised as a Write tool in the MCP Data Visualization 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 select_downloads_database_by_number? +

Register the MCP Data Visualization Server MCP server in PolicyLayer and add a rule for select_downloads_database_by_number: 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 MCP Data Visualization Server. Nothing to install.

What risk level is select_downloads_database_by_number? +

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

Can I rate-limit select_downloads_database_by_number? +

Yes. Add a rate_limit block to the select_downloads_database_by_number 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 select_downloads_database_by_number completely? +

Set action: deny in the PolicyLayer policy for select_downloads_database_by_number. 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 select_downloads_database_by_number? +

select_downloads_database_by_number is provided by the MCP Data Visualization Server MCP server (xoniks/mcp-visualization-duckdb). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Data Visualization Server tool call.

Start from MCP Data Visualization Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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