search_signals_tool
AI agents call search_signals_tool to retrieve information from Email Insights without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The name 'search_signals_tool' combined with the server's read-focused analytics purpose strongly suggests data retrieval with no side effects. Without a description, confidence is reduced, but the pattern of sibling tools and server function indicate this is a query/read operation that does not modify or delete data.
From the tool's definition Tool name 'search_signals_tool' with no description provided. Based on sibling tools (get_email_signals_tool, get_sender_patterns_tool, get_topic_distribution_tool) which all perform queries/retrievals, and the server's stated purpose of 'query email…
Attacks that exploit this kind of access
search_signals_tool. It is categorised as a Read tool in the Email Insights MCP Server, which means it retrieves data without modifying state.
Register the Email Insights MCP server in PolicyLayer and add a rule for search_signals_tool: 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 Email Insights. Nothing to install.
search_signals_tool 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 search_signals_tool 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 search_signals_tool. 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.
search_signals_tool is provided by the Email Insights MCP server (shubby98/email-insights). 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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