Extract a clean email preview snippet (preheader) from newsletter content. e.g., a 500-word HTML article returns the first 150 characters of clean readable text. Use to populate the email preheader that appears in inbox previews next to the subject line.
AI agents call generate_preview_text to retrieve information from Newsletter Tools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a pure extraction/transformation operation on input content, returning a text snippet. It does not write, execute, delete, or move any data. It is a read/transform utility analogous to the sibling tools like extract_plain_text and truncate_text.
From the tool's definition 'Extract a clean email preview snippet (preheader) from newsletter content' — the tool reads and extracts text from provided content with no side effects
Attacks that exploit this kind of access
Extract a clean email preview snippet (preheader) from newsletter content. e.g., a 500-word HTML article returns the first 150 characters of clean readable text. Use to populate the email preheader that appears in inbox previews next to the subject line. It is categorised as a Read tool in the Newsletter Tools MCP Server, which means it retrieves data without modifying state.
Register the Newsletter Tools MCP server in PolicyLayer and add a rule for generate_preview_text: 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 Newsletter Tools. Nothing to install.
generate_preview_text 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 generate_preview_text 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 generate_preview_text. 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.
generate_preview_text is provided by the Newsletter Tools MCP server (josephtandle/beehiiv-mcp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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