AI agents call get_html to retrieve information from Imap without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves the HTML body content of an email message identified by a unique ID (uid) from a mailbox directory. It performs a query/retrieval operation with no side effects, no data modification, no code execution, and no destructive actions. This is a pure read operation consistent with information retrieval from an IMAP mailbox.
From the tool's definition Tool name is 'get_html' and description states 'Read HTML body for the given uid in directory' - explicitly a read operation with no modification capability.
Attacks that exploit this kind of access
Read HTML body for the given uid in directory. It is categorised as a Read tool in the Imap MCP Server, which means it retrieves data without modifying state.
Register the Imap MCP server in PolicyLayer and add a rule for get_html: 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 Imap. Nothing to install.
get_html 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_html 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_html. 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_html is provided by the Imap MCP server (vivier/imap-mcp-server). 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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