Create a keyword for manual targeting in a CPC campaign ad group.
AI agents use ebay_create_keyword 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.
This tool creates new advertising data (keywords) that can be modified or deleted later, making it a Write operation. The severity is medium because misuse could lead to wasteful ad spend or campaign pollution, but the blast radius is limited to advertising configuration rather than core business operations or financial transactions.
From the tool's definition Tool creates a keyword for a CPC (cost-per-click) campaign ad group. The description explicitly uses the verb 'Create' and the action is to add a new keyword record to eBay's advertising system, which is a reversible data creation operation.
Documented attack patterns abuse exactly the kind of access ebay_create_keyword 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_create_keyword:
{
"version": "1",
"default": "deny",
"tools": {
"ebay_create_keyword": {
"limits": [
{
"counter": "ebay_create_keyword_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ebay_create_keyword 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.
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Create a keyword for manual targeting in a CPC campaign ad group. 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.
Register the Ebay MCP server in PolicyLayer and add a rule for ebay_create_keyword: 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_create_keyword is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the ebay_create_keyword 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_create_keyword. 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_create_keyword 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.