Create a new KV namespace
Risk signalsCreates key-value storage
Part of the Cloudflare server.
Free to start. No card required.
AI agents use kv_namespace_create to create or modify resources in Cloudflare. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call kv_namespace_create repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Cloudflare.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"kv_namespace_create": {
"limits": [
{
"counter": "kv_namespace_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Cloudflare policy for all 23 tools.
These attack patterns abuse exactly the kind of access kv_namespace_create gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a new KV namespace. It is categorised as a Write tool in the Cloudflare MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Cloudflare MCP server in PolicyLayer and add a rule for kv_namespace_create: 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 Cloudflare. Nothing to install.
kv_namespace_create 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 kv_namespace_create 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 kv_namespace_create. 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.
kv_namespace_create is provided by the Cloudflare MCP server (https://builds.mcp.cloudflare.com/sse). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 23 Cloudflare tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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