AI agents use ebay_update_item_promotion 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 modifies existing promotion data on eBay, which is a reversible write operation. While promotions can affect pricing and sales visibility, the operation itself is not destructive (data is not deleted) and does not constitute a financial transaction (no money moves directly). The primary risk is that an AI agent could misconfigure promotions, but this can be corrected.
From the tool's definition Tool name 'update_item_promotion' and description 'Update an existing item promotion' indicate modification of existing data. The action is reversible—promotions can be modified again or reverted.
Documented attack patterns abuse exactly the kind of access ebay_update_item_promotion 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_update_item_promotion:
{
"version": "1",
"default": "deny",
"tools": {
"ebay_update_item_promotion": {
"limits": [
{
"counter": "ebay_update_item_promotion_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ebay_update_item_promotion 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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Update an existing item promotion. 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_update_item_promotion: 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_update_item_promotion 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_update_item_promotion 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_update_item_promotion. 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_update_item_promotion 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.