AI agents call ckan_tag_list to retrieve information from Ckan without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of tags from a CKAN data portal. It performs a read-only operation that retrieves information without creating, modifying, deleting, or executing any actions. The blast radius of misuse is minimal—an agent could only access tag metadata that is typically public in data portal contexts.
From the tool's definition Tool name 'ckan_tag_list' and description 'Get list of all tags' indicate a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access ckan_tag_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ckan, and nothing reaches the server without passing your rules. This is the rule we recommend for ckan_tag_list:
{
"version": "1",
"default": "deny",
"tools": {
"ckan_tag_list": {}
}
}ckan_tag_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get list of all tags. It is categorised as a Read tool in the Ckan MCP Server, which means it retrieves data without modifying state.
Register the Ckan MCP server in PolicyLayer and add a rule for ckan_tag_list: 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 Ckan. Nothing to install.
ckan_tag_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the ckan_tag_list 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 ckan_tag_list. 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.
ckan_tag_list is provided by the Ckan MCP server (ondics/ckan-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ckan, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 Ckan tools catalogued and risk-classified — across an index of 43,000+ MCP servers.