AI agents call vapi_get_call to retrieve information from Mcp Vapi without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves call metadata and history (transcript, recording, cost, summary) without modifying state or triggering actions. It is clearly a Read operation. Severity is medium rather than low because transcripts and call recordings may contain sensitive personal or business information that could be exposed if an AI agent misuses this tool to access calls it should not have permission to query.
From the tool's definition Tool name 'vapi_get_call' and description 'Get full details of a call including transcript, recording URL, cost, end reason, and summary' indicate pure data retrieval with no modification or execution.
Attacks that exploit this kind of access
Get full details of a call including transcript, recording URL, cost, end reason, and summary. It is categorised as a Read tool in the Mcp Vapi MCP Server, which means it retrieves data without modifying state.
Register the Mcp Vapi MCP server in PolicyLayer and add a rule for vapi_get_call: 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 Mcp Vapi. Nothing to install.
vapi_get_call 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 vapi_get_call 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 vapi_get_call. 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.
vapi_get_call is provided by the Mcp Vapi MCP server (adhirajhangal/mcp-vapi). 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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