Publish a new Goofish/Xianyu second-hand item listing.
AI agents use publish_item to create or update resources in Goofish MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Goofish MCP Server environment.
The tool creates a new item listing on the Goofish platform, which is a write operation (reversible data creation). It does not execute arbitrary code, delete data, or move money. Severity is medium because a malicious agent could create spam listings or misleading listings, but the action itself is reversible through standard moderation or deletion.
From the tool's definition Tool description states 'Publish a new Goofish/Xianyu second-hand item listing' — creates a new marketplace listing, which is a reversible data creation action.
Documented attack patterns abuse exactly the kind of access publish_item gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Goofish MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for publish_item:
{
"version": "1",
"default": "deny",
"tools": {
"publish_item": {
"limits": [
{
"counter": "publish_item_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}publish_item 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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Publish a new Goofish/Xianyu second-hand item listing. It is categorised as a Write tool in the Goofish MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Goofish MCP Server MCP server in PolicyLayer and add a rule for publish_item: 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 Goofish MCP Server. Nothing to install.
publish_item 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 publish_item 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 publish_item. 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.
publish_item is provided by the Goofish MCP Server MCP server (mercy719/goofish-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Goofish MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 Goofish MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.