Read a value from Workers KV storage by key. Returns the stored value.
AI agents call read_kv_value to retrieve information from Cloudflare MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from Workers KV storage without modification, deletion, or execution of code. It has no side effects and presents minimal security risk—the worst outcome of misuse would be unauthorized data access, which is significant but less severe than tools that modify or delete data.
From the tool's definition Tool name 'read_kv_value' and description 'Read a value from Workers KV storage by key. Returns the stored value.' indicate a read-only retrieval operation.
Attacks that exploit this kind of access
Read a value from Workers KV storage by key. Returns the stored value. It is categorised as a Read tool in the Cloudflare MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Cloudflare MCP Server MCP server in PolicyLayer and add a rule for read_kv_value: 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 Server. Nothing to install.
read_kv_value 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 read_kv_value 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 read_kv_value. 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.
read_kv_value is provided by the Cloudflare MCP Server MCP server (ry-ops/cloudflare-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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