AI agents call apollo_search_people to retrieve information from Apollo Io without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries a B2B sales database to retrieve prospect information. While it is a read-only operation (no side effects on data integrity), it returns potentially sensitive PII (personally identifiable information) about individuals.
From the tool's definition Tool name 'apollo_search_people' and description 'Search for people/prospects in Apollo' indicate data retrieval with no modification or deletion. The verb 'search' is a classic read operation.
Attacks that exploit this kind of access
Search for people/prospects in Apollo. It is categorised as a Read tool in the Apollo Io MCP Server, which means it retrieves data without modifying state.
Register the Apollo Io MCP server in PolicyLayer and add a rule for apollo_search_people: 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 Apollo Io. Nothing to install.
apollo_search_people 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 apollo_search_people 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 apollo_search_people. 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.
apollo_search_people is provided by the Apollo Io MCP server (louis030195/apollo-io-mcp). 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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