Check whether up to 100 Viber users are currently online. Returns per-user status: online, offline, or undisclosed. Use before sending time-sensitive messages to prioritise active users. Note: some users may hide their status via privacy settings.
AI agents call get_online to retrieve information from Viber without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves online/offline status information about users without creating, modifying, deleting, or executing any actions. It is purely informational, similar to a status lookup. The worst-case misuse scenario—learning that certain users are online—poses minimal security risk. The note about privacy settings further confirms this is a read-only query that respects user configuration.
From the tool's definition Tool description states it 'Check[s] whether up to 100 Viber users are currently online' and 'Returns per-user status'. The verb 'check' and 'returns' indicate a query operation with no modification of data.
Attacks that exploit this kind of access
Check whether up to 100 Viber users are currently online. Returns per-user status: online, offline, or undisclosed. Use before sending time-sensitive messages to prioritise active users. Note: some users may hide their status via privacy settings. It is categorised as a Read tool in the Viber MCP Server, which means it retrieves data without modifying state.
Register the Viber MCP server in PolicyLayer and add a rule for get_online: 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 Viber. Nothing to install.
get_online 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_online 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_online. 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_online is provided by the Viber MCP server (serhiizghama/viber-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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