AI agents use add_topic_partitions to create or update resources in Lenses MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Lenses MCP Server environment.
Adding partitions modifies topic metadata and configuration but is technically reversible (partitions can be removed, though this is less common in Kafka). The action affects data distribution and throughput characteristics. It is not destructive (data is not deleted), not financial, and does not execute arbitrary code.
From the tool's definition Tool name 'add_topic_partitions' combined with description 'Add partitions to an existing topic' indicates modification of topic configuration. This is a reversible structural change to Kafka topics.
Documented attack patterns abuse exactly the kind of access add_topic_partitions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Lenses MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_topic_partitions:
{
"version": "1",
"default": "deny",
"tools": {
"add_topic_partitions": {
"limits": [
{
"counter": "add_topic_partitions_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_topic_partitions 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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Add partitions to an existing topic. It is categorised as a Write tool in the Lenses MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Lenses MCP Server MCP server in PolicyLayer and add a rule for add_topic_partitions: 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 Lenses MCP Server. Nothing to install.
add_topic_partitions 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 add_topic_partitions 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 add_topic_partitions. 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.
add_topic_partitions is provided by the Lenses MCP Server MCP server (lensesio/lenses-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Lenses 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.
42 Lenses MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.