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Cloudflare: KV namespaces

cf_kv_namespaces_list
Read-only

List Workers KV namespaces in the account.

Input Schema

NameRequiredDescriptionDefault
zoneOrIdNoZone name (e.g. your-tenant.com) or zone ID to resolve account.id
accountIdNoCloudflare account ID; overrides CLOUDFLARE_ACCOUNT_ID and zone.account.id
context_idNoOptional explicit Connection Hub work context (ctx_*). Omit to use the conversation's active workspace; global Hub tools ignore it.
account_slugNoCloudflare account slug. Required when the workspace has multiple accounts and the zone is not yet cataloged.
environment_slugNoCloud Catalog environment used as an account-routing preference when no zone is provided.

Output Schema

NameRequiredDescriptionDefault
okYes
dataYes
contractVersionYes
dataSchemaVersionYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed16 schema fields changed
    • changedOutput schema / properties / data / additionalProperties
      Previous value: -trueNew value: +false
    • removedOutput schema / properties / data / properties / count
      Removed value: -{
      -  "type": "number"
      -}
    • removedOutput schema / properties / data / properties / errors
      Removed value: -{
      -  "items": {
      -    "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -  },
      -  "type": "array"
      -}
    • addedOutput schema / properties / data / properties / gaps
      Added value: +{
      +  "items": {
      +    "type": "string"
      +  },
      +  "type": "array"
      +}
    • removedOutput schema / properties / data / properties / items
      Removed value: -{
      -  "$ref": "#/properties/data/properties/result/anyOf/0"
      -}
    • removedOutput schema / properties / data / properties / messages
      Removed value: -{
      -  "items": {
      -    "anyOf": [
      -      {
      -        "type": "string"
      -      },
      -      {
      -        "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -      }
      -    ]
      -  },
      -  "type": "array"
      -}
    • addedOutput schema / properties / data / properties / namespaces
      Added value: +{
      +  "items": {
      +    "additionalProperties": false,
      +    "properties": {
      +      "id": {
      +        "type": "string"
      +      },
      +      "supportsUrlEncoding": {
      +        "type": "boolean"
      +      },
      +      "title": {
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "id"
      +    ],
      +    "type": "object"
      +  },
      +  "type": "array"
      +}
    • addedOutput schema / properties / data / properties / partial
      Added value: +{
      +  "type": "boolean"
      +}
    • removedOutput schema / properties / data / properties / result
      Removed value: -{
      -  "anyOf": [
      -    {
      -      "items": {
      -        "additionalProperties": true,
      -        "properties": {},
      -        "type": "object"
      -      },
      -      "type": "array"
      -    },
      -    {
      -      "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -    }
      -  ]
      -}
    • removedOutput schema / properties / data / properties / result_info
      Removed value: -{
      -  "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -}
    • removedOutput schema / properties / data / properties / success
      Removed value: -{
      -  "type": "boolean"
      -}
    • addedOutput schema / properties / data / properties / truncated
      Added value: +{
      +  "type": "boolean"
      +}
    • addedOutput schema / properties / data / properties / warnings
      Added value: +{
      +  "items": {
      +    "type": "string"
      +  },
      +  "type": "array"
      +}
    • addedOutput schema / properties / data / required
      Added value: +[
      +  "namespaces",
      +  "partial",
      +  "truncated",
      +  "warnings",
      +  "gaps"
      +]
    • addedOutput schema / properties / dataSchemaVersion
      Added value: +{
      +  "const": 2,
      +  "type": "number"
      +}
    • changedOutput schema / required
      Previous value: -[
      -  "contractVersion",
      -  "ok",
      -  "data"
      -]New value: +[
      +  "contractVersion",
      +  "dataSchemaVersion",
      +  "ok",
      +  "data"
      +]
  2. First observed

TDQS

B3.2/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds only the account-scoping fact; it says nothing about pagination, result volume, or whether all namespaces are returned unpaged — the kind of detail that matters when enumerating.

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

Conciseness4/5

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

One front-loaded sentence with no filler or redundancy. Efficient, though the extreme brevity is itself the weakness rather than a virtue here.

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

Completeness3/5

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

An output schema exists and annotations carry the safety profile, so return-value detail is not needed. However, given five account-routing parameters and a cluster of related KV tools, the description leaves the agent to infer the account/zone resolution flow and the follow-up path to key listing.

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%, so all five parameters (zoneOrId, accountId, context_id, account_slug, environment_slug) are already documented inline with precedence rules. The description contributes nothing about the account-resolution chain or which parameter wins, so the baseline 3 applies.

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?

States a specific verb and resource ("List Workers KV namespaces") plus a scope ("in the account"). An agent can distinguish it from cf_kv_keys_list and cf_kv_value_get by the resource noun, but the description never names those siblings or clarifies the namespace-vs-key hierarchy.

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?

No when-to-use guidance, no note that listing namespaces is typically the prerequisite step for cf_kv_keys_list / cf_kv_value_get (which need a namespace ID). Nothing tells the agent when this tool is the right call versus the sibling KV tools.

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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