Set the user access token and refresh token for authenticated API requests. These tokens should be obtained through the OAuth authorization code flow. Tokens will be persisted to disk and automatically refreshed when needed. User tokens provide higher rate limits (10,000-50,000 requests/day) comp...
AI agents use ebay_set_user_tokens 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 writes OAuth tokens to disk storage, modifying persistent state. It is not destructive (no deletion), not financial (no money movement), but it does create/store credentials that grant authenticated access to eBay's Sell APIs. Misuse could allow an AI agent to store attacker-controlled tokens, effectively hijacking API authentication context.
From the tool's definition Set the user access token and refresh token for authenticated API requests. Tokens will be persisted to disk and automatically refreshed when needed.
Documented attack patterns abuse exactly the kind of access ebay_set_user_tokens 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_set_user_tokens:
{
"version": "1",
"default": "deny",
"tools": {
"ebay_set_user_tokens": {
"limits": [
{
"counter": "ebay_set_user_tokens_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ebay_set_user_tokens 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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Set the user access token and refresh token for authenticated API requests. These tokens should be obtained through the OAuth authorization code flow. Tokens will be persisted to disk and automatically refreshed when needed. User tokens provide higher rate limits (10,000-50,000 requests/day) compared to client credentials (1,000 requests/day). 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_set_user_tokens: 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_set_user_tokens 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_set_user_tokens 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_set_user_tokens. 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_set_user_tokens 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.