Provides a list of namespaces from the Iceberg catalog.
AI agents call get_namespaces to retrieve information from IcebergMCP 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 catalog namespace information without creating, modifying, deleting, or executing any operations. It is a straightforward read operation that retrieves metadata about the structure of an Iceberg data lakehouse catalog. No side effects or irreversible actions are possible.
From the tool's definition Tool name 'get_namespaces' and description 'Provides a list of namespaces from the Iceberg catalog' indicate a retrieval operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access get_namespaces gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and IcebergMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_namespaces:
{
"version": "1",
"default": "deny",
"tools": {
"get_namespaces": {}
}
}get_namespaces is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Provides a list of namespaces from the Iceberg catalog. It is categorised as a Read tool in the IcebergMCP MCP Server, which means it retrieves data without modifying state.
Register the Iceberg MCP server in PolicyLayer and add a rule for get_namespaces: 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 IcebergMCP. Nothing to install.
get_namespaces 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 get_namespaces 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 get_namespaces. 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.
get_namespaces is provided by the Iceberg MCP server (ryft-io/iceberg-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 IcebergMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
5 IcebergMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.