Create multiple ads using Inventory API references (SKU/inventory item group key). CPS campaigns only.
How to control ebay_bulk_create_ads_by_inventory_reference ↓
AI agents use ebay_bulk_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 (writes) advertising campaigns in bulk using inventory references. While not destructive (ads can be paused/deleted) and not directly financial (eBay processes payment separately), the ability to programmatically create hundreds of ads across inventory items poses high risk if misused: an AI agent could flood an account with unwanted campaigns, consume marketing budgets, or create ads for items the…
From the tool's definition Tool name contains 'bulk_create_ads' and description states 'Create multiple ads' — this performs irreversible creation of advertising assets at scale. eBay marketing campaigns, once created, incur real costs and occupy inventory slots.
Documented attack patterns abuse exactly the kind of access ebay_bulk_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_bulk_create_ads_by_inventory_reference:
{
"version": "1",
"default": "deny",
"tools": {
"ebay_bulk_create_ads_by_inventory_reference": {
"limits": [
{
"counter": "ebay_bulk_create_ads_by_inventory_reference_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ebay_bulk_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.
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Create multiple ads using Inventory API references (SKU/inventory item group key). 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_bulk_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_bulk_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_bulk_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_bulk_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_bulk_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.
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332 Ebay tools catalogued and risk-classified — across an index of 42,500+ MCP servers.