Re-format and filter a list of email objects (previously fetched) into a custom structure. Supports field selection, filtering by field value, and sorting.
AI agents call format_emails to retrieve information from Gmail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool operates on already-fetched email objects and performs client-side data transformation (formatting, filtering, sorting). It has no side effects: it does not create, modify, delete, or send emails, nor does it execute code or interact with external systems. It is purely a Read operation that structures existing data for presentation.
From the tool's definition Tool description states it 're-format[s] and filter[s] a list of email objects (previously fetched) into a custom structure' with 'field selection, filtering by field value, and sorting' — operations that transform data representation without modifying,…
Attacks that exploit this kind of access
Re-format and filter a list of email objects (previously fetched) into a custom structure. Supports field selection, filtering by field value, and sorting. It is categorised as a Read tool in the Gmail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for format_emails: 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 Gmail MCP Server. Nothing to install.
format_emails 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 format_emails 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 format_emails. 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.
format_emails is provided by the Gmail MCP Server MCP server (neutral-stage/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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