Retrieve a list of calls with optional filtering
AI agents call get_calls to retrieve information from VoIPBin MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing call records with optional filters. It performs no modifications, deletions, or external operations—purely data retrieval. While it accesses potentially sensitive call data (typical in VoIP systems), the read-only nature and filtering capability place it in the Read category with low severity, as an AI agent misusing this would only expose information rather than cause…
From the tool's definition Tool name 'get_calls' and description 'Retrieve a list of calls with optional filtering' indicate a read-only query operation that retrieves data without side effects.
Attacks that exploit this kind of access
Retrieve a list of calls with optional filtering. It is categorised as a Read tool in the VoIPBin MCP Server MCP Server, which means it retrieves data without modifying state.
Register the VoIPBin MCP Server MCP server in PolicyLayer and add a rule for get_calls: 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 VoIPBin MCP Server. Nothing to install.
get_calls 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 get_calls 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 get_calls. 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.
get_calls is provided by the VoIPBin MCP Server MCP server (nrjchnd/voipbin-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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