Send a JPEG or PNG image with an optional caption to a Viber user. Use when sharing visual content such as photos, screenshots, or diagrams. Do not use for videos or documents — use send_video or send_file instead. Returns message_token for delivery tracking.
AI agents use send_picture to create or update resources in Viber — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Viber environment.
The tool creates a new message in a Viber chat by transmitting an image to a user. This is a Write operation—it modifies user-visible state (adds a message) in a reversible manner. Severity is medium because unwanted bulk image sending could spam users or be used for misinformation/scams, but the impact is limited to message delivery (not financial, not destructive).
From the tool's definition Tool sends image content to Viber users: 'Send a JPEG or PNG image with an optional caption to a Viber user.' Creates a message record ('Returns message_token for delivery tracking'). This is reversible message creation, not irreversible deletion.
Attacks that exploit this kind of access
Send a JPEG or PNG image with an optional caption to a Viber user. Use when sharing visual content such as photos, screenshots, or diagrams. Do not use for videos or documents — use send_video or send_file instead. Returns message_token for delivery tracking. It is categorised as a Write tool in the Viber MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Viber MCP server in PolicyLayer and add a rule for send_picture: 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.
send_picture is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the send_picture 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 send_picture. 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.
send_picture 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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