ebay_create_signing_key

SERVEREbay SOURCEyosefhayim/ebay-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/yosefhayim-ebay-mcp/ebay-create-signing-key.md

WHAT IT DOES

What ebay_create_signing_key does on Ebay

AI agents use ebay_create_signing_key to create or update resources in Ebay, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ebay environment.

RISK

Why ebay_create_signing_key is rated Medium

Creates a cryptographic keypair; reversible by creating new keys, but misuse could disrupt API signing.

From the tool's definition Create a new signing keypair for API digital signatures

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs ebay_create_signing_key safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ebay, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For ebay_create_signing_key, this is the rule to start with:

ebay_create_signing_key Rate-limited

ebay_create_signing_key stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ebay_create_signing_key": {
      "limits": [
        {
          "counter": "ebay_create_signing_key_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ebay, apply this rule, and every ebay_create_signing_key call is checked against it from then on.

FAQ

Questions about ebay_create_signing_key

What does the ebay_create_signing_key tool do? +

Create a new signing keypair for API digital signatures. Supports ED25519 (recommended) or RSA ciphers. IMPORTANT: Save the private key immediately as eBay does not store it. To sign the calls eBay requires signatures on for EU/UK sellers (Finances API, issueRefund), set EBAY_SIGNING_KEY_JWE to the returned jwe and EBAY_SIGNING_PRIVATE_KEY to the returned privateKey, then restart the server. It is categorised as a Write tool in the Ebay MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ebay_create_signing_key? +

Register the Ebay MCP server in PolicyLayer and add a rule for ebay_create_signing_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.

What risk level is ebay_create_signing_key? +

ebay_create_signing_key is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit ebay_create_signing_key? +

Yes. Add a rate_limit block to the ebay_create_signing_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.

How do I block ebay_create_signing_key completely? +

Set action: deny in the PolicyLayer policy for ebay_create_signing_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.

What MCP server provides ebay_create_signing_key? +

ebay_create_signing_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.

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