list_news_types

List all available market news type codes for filtering.

SERVEROpenNews MCP SOURCE6551team/opennews-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade A, identity unverified Pull the record →

This record as markdown: /tools/6551team-opennews-mcp/list-news-types.md

WHAT IT DOES

What list_news_types does on OpenNews MCP

AI agents call list_news_types to retrieve information from OpenNews MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_news_types is rated Low

This tool retrieves and enumerates available news type codes for informational purposes only. It performs no modifications, deletions, code execution, or financial transactions. It is a pure read operation with minimal blast radius—the worst outcome is that an agent uses the wrong filter code, resulting in incorrect news retrieval rather than any irreversible harm or financial impact.

From the tool's definition Tool name 'list_news_types' and description 'List all available market news type codes for filtering' indicate a query/list operation that retrieves metadata without side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_news_types safely

PolicyLayer is an MCP gateway: it sits between your AI agents and OpenNews MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_news_types, this is the rule to start with:

list_news_types Allowed

list_news_types is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect OpenNews MCP, apply this rule, and every list_news_types call is checked against it from then on.

FAQ

Questions about list_news_types

What does the list_news_types tool do? +

List all available market news type codes for filtering. It is categorised as a Read tool in the OpenNews MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_news_types? +

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

What risk level is list_news_types? +

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

Can I rate-limit list_news_types? +

Yes. Add a rate_limit block to the list_news_types 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_news_types completely? +

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

list_news_types is provided by the OpenNews MCP server (6551team/opennews-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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