jasper_set_input_control_values

THE RISK

Medium Risk

Why jasper_set_input_control_values needs a policy

This tool modifies input control values, which are configuration parameters for reports. While reversible through subsequent updates, it changes report behavior and can affect downstream report execution and data presentation. This is a Write operation rather than Read (queries data) or Execute (runs arbitrary code).

From the tool's definition Tool name contains 'set' and description states 'Set values for cascading input controls', indicating modification of control parameters that affect report execution.

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

POLICY

How to control jasper_set_input_control_values

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

policy.json

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

jasper_set_input_control_values 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 Jasperreports — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 37 Jasperreports tools →

Write tools on other servers

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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 jasper_set_input_control_values

What does the jasper_set_input_control_values tool do? +

Set values for cascading input controls. It is categorised as a Write tool in the Jasperreports MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on jasper_set_input_control_values? +

Register the Jasperreports MCP server in PolicyLayer and add a rule for jasper_set_input_control_values: 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 Jasperreports. Nothing to install.

What risk level is jasper_set_input_control_values? +

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

Can I rate-limit jasper_set_input_control_values? +

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

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

jasper_set_input_control_values is provided by the Jasperreports MCP server (mr-wolf-gb/jasperreports-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Jasperreports tool call.

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

CHECK YOUR STACK →