Fetch and aggregate news from 40+ RSS feeds covering macro, markets,
AI agents call fetch_news to retrieve information from Market Brief without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and aggregates news data from existing RSS feeds. It does not modify, delete, execute code, or create financial transactions. The worst misuse would be retrieving sensitive market information early, but the impact is limited to data access. This is a straightforward Read category tool with low severity.
From the tool's definition Tool name is 'fetch_news' and description states 'Fetch and aggregate news from 40+ RSS feeds' — these are purely data retrieval operations with no side effects.
Attacks that exploit this kind of access
Fetch and aggregate news from 40+ RSS feeds covering macro, markets,. It is categorised as a Read tool in the Market Brief MCP Server, which means it retrieves data without modifying state.
Register the Market Brief MCP server in PolicyLayer and add a rule for fetch_news: 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 Market Brief. Nothing to install.
fetch_news is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the fetch_news 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.
Set action: deny in the PolicyLayer policy for fetch_news. 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.
fetch_news is provided by the Market Brief MCP server (yukipanpan/marketbrief). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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