cf_kv

Manage Cloudflare KV store.

SERVERYaver SOURCEyaver-cli

Medium RISK CLASS

Category Write

Parameters 41 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-kivanccakmak-yaver/cf-kv.md

WHAT IT DOES

What cf_kv does on Yaver

AI agents use cf_kv to create or update resources in Yaver, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Yaver environment.

Parameter	Type	Required	Description
`key`	string	—
`value`	string	—
`action`	string	Yes	list, keys, get, put
`namespace`	string	—

Parameters from the server's own tool schema.

RISK

Why cf_kv is rated Medium

While the description does not explicitly state 'delete', 'manage' typically encompasses create, read, update, and delete operations. However, without explicit evidence of destructive operations, this is classified as Write rather than Destructive.

From the tool's definition Tool name 'cf_kv' combined with description 'Manage Cloudflare KV store' indicates ability to create, modify, and manage key-value data in Cloudflare's distributed storage system.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs cf_kv safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Yaver, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For cf_kv, this is the rule to start with:

cf_kv Rate-limited

cf_kv 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cf_kv": {
      "limits": [
        {
          "counter": "cf_kv_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Yaver, apply this rule, and every cf_kv call is checked against it from then on.

FAQ

Questions about cf_kv

What does the cf_kv tool do? +

Manage Cloudflare KV store. It is categorised as a Write tool in the Yaver MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does cf_kv accept? +

cf_kv accepts 4 parameters: key, value, action, namespace. Required: action. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on cf_kv? +

Register the Yaver MCP server in PolicyLayer and add a rule for cf_kv: 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 Yaver. Nothing to install.

What risk level is cf_kv? +

cf_kv is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit cf_kv? +

Yes. Add a rate_limit block to the cf_kv 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.

How do I block cf_kv completely? +

Set action: deny in the PolicyLayer policy for cf_kv. 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.

What MCP server provides cf_kv? +

cf_kv is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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