List dictionary items
Part of the U2 MCP Server server.
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AI agents call list_dictionary to retrieve information from U2 MCP Server 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 list_dictionary 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": {
"list_dictionary": {}
}
}See the full U2 MCP Server policy for all 22 tools.
These attack patterns abuse exactly the kind of access list_dictionary 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.
List dictionary items. It is categorised as a Read tool in the U2 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the U2 MCP Server MCP server in PolicyLayer and add a rule for list_dictionary: 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 U2 MCP Server. Nothing to install.
list_dictionary 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 list_dictionary 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 list_dictionary. 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.
list_dictionary is provided by the U2 MCP Server MCP server (pypi:u2-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 U2 MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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