AI agents use storeValue to create or update resources in Cloudflare MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Cloudflare MCP environment.
This tool creates or modifies data in Cloudflare KV storage. It is reversible (values can be updated or deleted via other operations), so it qualifies as Write rather than Destructive. The severity is medium because unauthorized writes to KV storage could corrupt application state or configuration, though the blast radius depends on what data is stored and how it's used by the application.
From the tool's definition Tool name 'storeValue' and description 'Store a simple key-value pair in Cloudflare KV' indicates data modification via key-value storage operations.
Documented attack patterns abuse exactly the kind of access storeValue gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cloudflare MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for storeValue:
{
"version": "1",
"default": "deny",
"tools": {
"storeValue": {
"limits": [
{
"counter": "storevalue_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}storeValue 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.
Free to start. No card required.
Store a simple key-value pair in Cloudflare KV. It is categorised as a Write tool in the Cloudflare MCP 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 storeValue: 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 MCP. Nothing to install.
storeValue 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 storeValue 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 storeValue. 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.
storeValue is provided by the Cloudflare MCP server (shashankboosi/cloudflare-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Cloudflare MCP, 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.
7 Cloudflare MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.