ebay_create_offer
Create a new offer (unpublished listing draft) for an inventory item SKU.\n\nFIXED_PRICE offers take pricingSummary.price and listingDuration GTC. AUCTION offers take pricingSummary.auctionStartPrice (opening bid), an optional auctionReservePrice above it, an optional pricingSummary.price as Buy ...
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What ebay_create_offer does on Ebay
AI agents use ebay_create_offer 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.
Why ebay_create_offer is rated Medium
Creates draft listings that can be published to affect inventory and sales channels; reversible until published.
From the tool's definition Create a new offer (unpublished listing draft) for an inventory item SKU
Attacks that exploit this kind of access
The rule that runs ebay_create_offer 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_offer, this is the rule to start with:
ebay_create_offer 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Ebay, apply this rule, and every ebay_create_offer call is checked against it from then on.
Questions about ebay_create_offer
Create a new offer (unpublished listing draft) for an inventory item SKU.\n\nFIXED_PRICE offers take pricingSummary.price and listingDuration GTC. AUCTION offers take pricingSummary.auctionStartPrice (opening bid), an optional auctionReservePrice above it, an optional pricingSummary.price as Buy It Now (at least 30% above the opening bid, and not together with Best Offer), a day-count listingDuration (DAYS_1/3/5/7/10, or DAYS_14/21/30 where the category allows; never GTC), availableQuantity omitted or 1, and no per-buyer limit or eBay Plus. Do not add listingStartDate unless the user asked for a scheduled start (it can incur a fee). Bodies that mix the two formats are rejected before any eBay request.\n\nCheck ebay_get_listing_type_policies for the formats and durations the category allows, then ebay_get_listing_fees (reserve prices carry a fee) before ebay_publish_offer. 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_offer: 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_offer 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_offer 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_offer. 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_offer 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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