Read actual table rows from a Jersey resource via CKAN datastore_search. Works only for resources with datastore_active=true (get the resource_id from dataset_details). Returns parsed records plus field definitions — e.g. population projections by Year/Age/Sex.
Part of the Jersey Opendata server.
Free to start. No card required.
AI agents call datastore_query to retrieve information from Jersey Opendata without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though datastore_query only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"datastore_query": {}
}
}See the full Jersey Opendata policy for all 25 tools.
These attack patterns abuse exactly the kind of access datastore_query gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Read actual table rows from a Jersey resource via CKAN datastore_search. Works only for resources with datastore_active=true (get the resource_id from dataset_details). Returns parsed records plus field definitions — e.g. population projections by Year/Age/Sex.. It is categorised as a Read tool in the Jersey Opendata MCP Server, which means it retrieves data without modifying state.
Register the Jersey Opendata MCP server in PolicyLayer and add a rule for datastore_query: 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 Jersey Opendata. Nothing to install.
datastore_query 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 datastore_query 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 datastore_query. 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.
datastore_query is provided by the Jersey Opendata MCP server (https://gateway.pipeworx.io/jersey-opendata/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 Jersey Opendata tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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