Get list of messages from the sandbox test inbox
AI agents call get-sandbox-messages to retrieve information from Mcp Mailtrap without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or lists data (messages) from a sandbox inbox with no side effects or modifications. The sandbox context further confirms this is a read-only testing operation. Data exposure risk is minimal since it is limited to test messages in a designated sandbox environment.
From the tool's definition Tool name 'get-sandbox-messages' and description 'Get list of messages from the sandbox test inbox' indicate a retrieval operation querying data from a test/sandbox environment.
Attacks that exploit this kind of access
Get list of messages from the sandbox test inbox. It is categorised as a Read tool in the Mcp Mailtrap MCP Server, which means it retrieves data without modifying state.
Register the Mcp Mailtrap MCP server in PolicyLayer and add a rule for get-sandbox-messages: 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 Mailtrap. Nothing to install.
get-sandbox-messages 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-sandbox-messages 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-sandbox-messages. 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-sandbox-messages is provided by the Mcp Mailtrap MCP server (mcp-mailtrap). 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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