AI agents call wave_list_accounts to retrieve information from Waveapps without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves accounting data (list of active accounts) without creating, modifying, deleting, or executing any operations. It is purely informational, making it a Read category tool with low severity since unauthorized access to account lists poses minimal immediate risk compared to tools that modify financial records or execute transactions.
From the tool's definition Tool name 'wave_list_accounts' and description 'Lists active accounts in the chart of accounts' indicate a query/retrieval operation with no modification of data.
Attacks that exploit this kind of access
Lists active accounts in the chart of accounts. Use this to find the integer. It is categorised as a Read tool in the Waveapps MCP Server, which means it retrieves data without modifying state.
Register the Waveapps MCP server in PolicyLayer and add a rule for wave_list_accounts: 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 Waveapps. Nothing to install.
wave_list_accounts 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 wave_list_accounts 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 wave_list_accounts. 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.
wave_list_accounts is provided by the Waveapps MCP server (lunaparker/waveapps-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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