Create ads using Inventory API references. CPS campaigns only.
AI agents use ebay_create_ads_by_inventory_reference 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 advertising content in eBay's marketing system, which is a write operation that modifies data reversibly. While the blast radius is significant (creating ads affects seller's marketing presence and can incur costs), it is not inherently Financial (no direct money movement), Destructive (ads can be deleted), or Execute (no arbitrary code execution).
From the tool's definition The tool 'ebay_create_ads_by_inventory_reference' with description 'Create ads using Inventory API references' performs a create operation that modifies eBay's advertising system by adding new ads to CPS campaigns.
Documented attack patterns abuse exactly the kind of access ebay_create_ads_by_inventory_reference 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_ads_by_inventory_reference:
{
"version": "1",
"default": "deny",
"tools": {
"ebay_create_ads_by_inventory_reference": {
"limits": [
{
"counter": "ebay_create_ads_by_inventory_reference_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ebay_create_ads_by_inventory_reference 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.
Free to start. No card required.
Create ads using Inventory API references. CPS campaigns only. 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_ads_by_inventory_reference: 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_ads_by_inventory_reference 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_ads_by_inventory_reference 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_ads_by_inventory_reference. 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_ads_by_inventory_reference 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.