AI agents call wave_get_invoice_settings 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 configuration data (invoice numbering, terms, branding defaults) without creating, modifying, or deleting anything. It is a read-only query operation with no destructive or financial impact. The blast radius of misuse is minimal—an attacker learns invoice formatting defaults only.
From the tool's definition Tool name contains 'get_' prefix and description states it 'Returns the workspace-wide invoice settings' with no modification or side effects.
Attacks that exploit this kind of access
Returns the workspace-wide invoice settings (numbering, terms, branding) used as defaults on new invoices. 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_get_invoice_settings: 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_get_invoice_settings 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_get_invoice_settings 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_get_invoice_settings. 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_get_invoice_settings 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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