Codewars

User

user

Read-onlyIdempotent

Fetch a Codewars user's public profile by username: honor, clan, leaderboard rank, overall language ranks, and skills.

Input Schema

Name	Required	Description	Default
`username`	Yes

Output Schema

Name	Required	Description
`clan`	No	User's clan name
`name`	No	User's display name
`honor`	No	User's honor points
`ranks`	No
`skills`	No	List of programming skills
`username`	No	Codewars username
`code_challenges`	No
`leaderboard_position`	No	Position on leaderboard

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedMay 24, 2026

addedInput schema / examples

Added value: +[
+  {
+    "username": "codewars_user"
+  }
+]

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "clan": {
+      "description": "User's clan name",
+      "type": "string"
+    },
+    "code_challenges": {
+      "properties": {
+        "total_authored": {
+          "description": "Total authored kata",
+          "type": "number"
+        },
+        "total_completed": {
+          "description": "Total completed challenges",
+          "type": "number"
+        }
+      },
+      "type": "object"
+    },
+    "honor": {
+      "description": "User's honor points",
+      "type": "number"
+    },
+    "leaderboard_position": {
+      "description": "Position on leaderboard",
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "name": {
+      "description": "User's display name",
+      "type": "string"
+    },
+    "ranks": {
+      "properties": {
+        "languages": {
+          "description": "Language-specific ranks",
+          "type": "object"
+        },
+        "overall": {
+          "properties": {
+            "color": {
+              "description": "Rank color code",
+              "type": "string"
+            },
+            "name": {
+              "description": "Rank name",
+              "type": "string"
+            },
+            "rank": {
+              "description": "Overall rank number",
+              "type": "number"
+            },
+            "score": {
+              "description": "Overall score",
+              "type": "number"
+            }
+          },
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "skills": {
+      "description": "List of programming skills",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "username": {
+      "description": "Codewars username",
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

First observedMay 20, 2026

TDQS

A3.6/5.0

Behavior3/5

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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint true, so the description need not repeat safety. It adds context by listing returned fields and stating 'public profile', but does not disclose potential errors, rate limits, or whether authentication is required (though likely not needed for public profile).

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?

Single sentence, highly concise, no redundancy. Lists key output fields efficiently. Could be slightly improved with bullet points, but structure is adequate.

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

Completeness4/5

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

Given the output schema likely defines return structure, the description covers the essential purpose and output scope. It does not mention error conditions or rate limits, but for a simple public fetch with full annotations, it is reasonably complete.

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

Parameters2/5

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

Schema description coverage is 0%, so the description should compensate for the undocumented 'username' parameter. However, it only says 'by username', offering no format, constraints, or examples beyond the schema's provided example.

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

Purpose5/5

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

Description clearly states the verb 'Fetch' and specific resource 'Codewars user's public profile', listing key fields (honor, clan, rank). This distinguishes it from sibling tools like 'kata' (fetch kata) or 'user_completed' (completed katas).

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

Usage Guidelines3/5

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

The description implies usage (to get user profile) but does not explicitly state when to use versus alternatives, nor does it provide when-not-to-use guidance. For a simple tool, this is adequate but lacks differentiation from siblings like 'user_authored' or 'resolve_entity'.

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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