list_contexts_by_type

THE RISK

Low Risk

Why list_contexts_by_type needs a policy

This tool retrieves or queries existing contexts by filtering them by type. It performs no modifications, deletions, or external operations—purely informational retrieval. The blast radius of misuse is minimal (information disclosure about test contexts), warranting low severity.

From the tool's definition Tool name 'list_contexts_by_type' and description 'Lists all contexts of a specific type' indicate a query/retrieval operation with no side effects.

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

POLICY

How to control list_contexts_by_type

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

policy.json

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

list_contexts_by_type 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 MockLoop MCP 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 MockLoop MCP Server tools

Execute deploy_scenario Deploys scenario to MockLoop server. Execute execute_test_plan Combines scenario generation and deployment in one operation. Execute run_load_test Executes load testing with configurable parameters. Execute run_security_test Executes security testing scenarios for vulnerability assessment. Execute run_test_iteration Executes a single test iteration with monitoring. Execute generate_mock_api Generates a FastAPI mock server from an API specification (e.g., OpenAPI). Execute schedule_test_suite Schedules automated test suite execution. Execute switch_scenario Switches active scenario on a server.

All 30 MockLoop MCP Server 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 list_contexts_by_type

What does the list_contexts_by_type tool do? +

Lists all contexts of a specific type. It is categorised as a Read tool in the MockLoop MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_contexts_by_type? +

Register the MockLoop MCP Server MCP server in PolicyLayer and add a rule for list_contexts_by_type: 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 MockLoop MCP Server. Nothing to install.

What risk level is list_contexts_by_type? +

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

Can I rate-limit list_contexts_by_type? +

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

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

list_contexts_by_type is provided by the MockLoop MCP Server MCP server (mockloop/mockloop-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MockLoop MCP Server tool call.

Start from MockLoop MCP 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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