AI agents call aevo_list_markets to retrieve information from Aevo-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name and server description indicate this retrieves market information without modifying state. However, in a financial trading platform context, even read access to market data carries medium severity due to potential information asymmetry or market manipulation risks if an AI agent could selectively access or withhold market data.
From the tool's definition Tool name 'aevo_list_markets' with 'list' prefix indicates data retrieval. Server context shows market data retrieval is a stated capability ('Retrieve market data'). Empty description reduces confidence slightly.
Attacks that exploit this kind of access
aevo_list_markets. It is categorised as a Read tool in the Aevo-MCP MCP Server, which means it retrieves data without modifying state.
Register the Aevo- MCP server in PolicyLayer and add a rule for aevo_list_markets: 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 Aevo-MCP. Nothing to install.
aevo_list_markets 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 aevo_list_markets 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 aevo_list_markets. 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.
aevo_list_markets is provided by the Aevo- MCP server (ribbon-finance/aevo-mcp). 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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