mcp-server-cloudflare

cf_kv_keys

List keys stored in a Cloudflare KV namespace to manage and organize your data. Filter results by prefix and limit output for efficient data handling.

Instructions

List keys in a KV namespace

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "namespaceId": "<namespaceId>"
    },
    "name": "cf_kv_keys"
  }
}

Input Schema

Name	Required	Description
`namespaceId`	Yes	KV namespace ID
`prefix`	No	Key prefix filter
`limit`	No	Limit
`accountId`	No	Account ID

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.1Mar 10, 2026

TDQS

C2.9/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the action ('List keys') but doesn't describe behavioral traits such as pagination, rate limits, authentication requirements, or what the output looks like (e.g., list format, error handling). For a read operation with zero annotation coverage, this leaves significant gaps in understanding how the tool behaves.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states the tool's purpose without any wasted words. It's front-loaded and appropriately sized for a simple listing operation, making it easy to parse quickly.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's moderate complexity (4 parameters, no output schema, no annotations), the description is incomplete. It lacks information on output format, error conditions, authentication needs, and usage context. While the schema covers parameters, the description doesn't provide enough context for an agent to fully understand how to invoke and interpret results effectively.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, meaning all parameters are documented in the schema. The description adds no additional meaning beyond what the schema provides—it doesn't explain parameter interactions, default behaviors, or usage examples. With high schema coverage, the baseline score of 3 is appropriate as the description doesn't compensate but also doesn't detract.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb ('List') and resource ('keys in a KV namespace'), making the purpose immediately understandable. It distinguishes this tool from siblings like cf_kv_get (retrieve values) and cf_kv_put (store values), though it doesn't explicitly mention these distinctions. The description is specific but lacks explicit sibling differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing a namespace ID), when not to use it, or direct alternatives like cf_kv_namespaces (which might list namespaces rather than keys). Usage is implied by the action but not explicitly contextualized.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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