ros2_medkit_list_cyclic_subs

THE RISK

Low Risk

Why ros2_medkit_list_cyclic_subs needs a policy

This tool retrieves and enumerates cyclic subscription data for a given entity in the ROS 2 system. It performs a read-only query operation without creating, modifying, deleting, or executing any actions. The blast radius of misuse is minimal—an attacker could only discover information about subscriptions, not alter system state or trigger operations.

From the tool's definition Tool name includes 'list' and description states 'List all cyclic subscriptions' — a retrieval/query operation with no side effects.

Documented attack patterns abuse exactly the kind of access ros2_medkit_list_cyclic_subs gives an agent:

POLICY

How to control ros2_medkit_list_cyclic_subs

PolicyLayer is an MCP gateway — it sits between your AI agents and Ros2 Medkit, and nothing reaches the server without passing your rules. This is the rule we recommend for ros2_medkit_list_cyclic_subs:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ros2_medkit_list_cyclic_subs": {}
  }
}

ros2_medkit_list_cyclic_subs is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Ros2 Medkit — 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 Ros2 Medkit tools

Destructive ros2_medkit_bulkdata_delete Delete a bulk data item. Destructive ros2_medkit_clear_all_faults Clear all faults for a specific entity. WARNING: This clears ALL active faults for the ent Destructive ros2_medkit_delete_all_configurations Reset all configurations (parameters) for an entity to their default values. WARNING: This Destructive ros2_medkit_delete_configuration Reset a configuration (parameter) to its default value. Use ros2_medkit_list_configuration Destructive ros2_medkit_delete_cyclic_sub Delete a cyclic subscription. Destructive ros2_medkit_delete_script Delete a script from an entity. Destructive ros2_medkit_delete_trigger Delete a trigger from an entity. Destructive ros2_medkit_delete_update Delete a registered update.

All 84 Ros2 Medkit tools →

Read 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ros2_medkit_list_cyclic_subs

What does the ros2_medkit_list_cyclic_subs tool do? +

List all cyclic subscriptions for an entity. It is categorised as a Read tool in the Ros2 Medkit MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on ros2_medkit_list_cyclic_subs? +

Register the Ros2 Medkit MCP server in PolicyLayer and add a rule for ros2_medkit_list_cyclic_subs: 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 Ros2 Medkit. Nothing to install.

What risk level is ros2_medkit_list_cyclic_subs? +

ros2_medkit_list_cyclic_subs is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit ros2_medkit_list_cyclic_subs? +

Yes. Add a rate_limit block to the ros2_medkit_list_cyclic_subs 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 ros2_medkit_list_cyclic_subs completely? +

Set action: deny in the PolicyLayer policy for ros2_medkit_list_cyclic_subs. 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 ros2_medkit_list_cyclic_subs? +

ros2_medkit_list_cyclic_subs is provided by the Ros2 Medkit MCP server (selfpatch/ros2_medkit_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Ros2 Medkit tool call.

Start from Ros2 Medkit, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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