Create an ad group-level negative keyword. Prevents ads in this ad group from showing for this keyword.
AI agents use ebay_create_ad_group_negative_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 a new advertising configuration record (a negative keyword) that reversibly modifies how ads are displayed. While it affects marketing behavior, the change is not destructive (can be removed) and does not involve financial transactions or code execution.
From the tool's definition The tool 'ebay_create_ad_group_negative_keyword' creates a new negative keyword entry at the ad group level, which modifies advertising configuration. The verb 'create' and phrase 'Create an ad group-level negative keyword' indicate data creation/modification.
Documented attack patterns abuse exactly the kind of access ebay_create_ad_group_negative_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_ad_group_negative_keyword:
{
"version": "1",
"default": "deny",
"tools": {
"ebay_create_ad_group_negative_keyword": {
"limits": [
{
"counter": "ebay_create_ad_group_negative_keyword_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ebay_create_ad_group_negative_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.
Free to start. No card required.
Create an ad group-level negative keyword. Prevents ads in this ad group from showing for this keyword. 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_ad_group_negative_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_ad_group_negative_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_ad_group_negative_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_ad_group_negative_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_ad_group_negative_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.