Get a public key for verifying notification signatures
AI agents call ebay_get_notification_public_key to retrieve information from Ebay without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward read operation that retrieves cryptographic material needed to verify webhook signatures. It has no capability to modify, delete, or execute anything, and poses minimal risk even if an AI agent calls it unnecessarily.
From the tool's definition The tool description explicitly states it 'Get[s] a public key' — a retrieval operation with no side effects. Public keys are by design non-sensitive data meant to be distributed and used for cryptographic verification.
Documented attack patterns abuse exactly the kind of access ebay_get_notification_public_key gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ebay, and nothing reaches the server without passing your rules. This is the rule we recommend for ebay_get_notification_public_key:
{
"version": "1",
"default": "deny",
"tools": {
"ebay_get_notification_public_key": {}
}
}ebay_get_notification_public_key is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a public key for verifying notification signatures. It is categorised as a Read tool in the Ebay MCP Server, which means it retrieves data without modifying state.
Register the Ebay MCP server in PolicyLayer and add a rule for ebay_get_notification_public_key: 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 Ebay. Nothing to install.
ebay_get_notification_public_key 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 ebay_get_notification_public_key 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 ebay_get_notification_public_key. 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.
ebay_get_notification_public_key is provided by the Ebay MCP server (yosefhayim/ebay-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 332 Ebay tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
332 Ebay tools catalogued and risk-classified — across an index of 42,500+ MCP servers.