Look up information any of the 2700+ stock exchanges supported by this endpoint.
AI agents call list_exchanges to retrieve information from Marketstack MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves exchange information from the Marketstack API without creating, modifying, deleting, or executing any operations. It is a pure read operation that queries existing financial market data. The low severity reflects minimal risk even if misused, as it only exposes public exchange reference information.
From the tool's definition Tool name 'list_exchanges' and description 'Look up information any of the 2700+ stock exchanges' indicate a query/retrieval operation with no modification or execution capability.
Attacks that exploit this kind of access
Look up information any of the 2700+ stock exchanges supported by this endpoint. It is categorised as a Read tool in the Marketstack MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Marketstack MCP Server MCP server in PolicyLayer and add a rule for list_exchanges: 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 Marketstack MCP Server. Nothing to install.
list_exchanges 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 list_exchanges 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 list_exchanges. 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.
list_exchanges is provided by the Marketstack MCP Server MCP server (matteoantoci/mcp-marketstack). 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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