Riddles By Api Ninjas MCP Server
Server Quality Checklist
Latest release: v1.0.0
- Disambiguation5/5
With only one tool, there is no possibility of ambiguity or overlap between tools. The tool's purpose is clearly defined as fetching random riddles, leaving no room for confusion or misselection.
Naming Consistency5/5Since there is only one tool, naming consistency is inherently perfect. The tool name 'v1riddles' follows a single pattern, and there are no other tools to compare it against for inconsistency.
Tool Count2/5A single tool is too few for a server focused on riddles, as it lacks basic operations like getting riddles by category, difficulty, or ID. This minimal scope limits functionality and makes the server feel incomplete for its apparent domain.
Completeness2/5The tool surface is severely incomplete for a riddles domain. It only supports fetching random riddles, missing essential operations such as retrieving specific riddles, filtering by parameters, or managing user interactions. This creates significant gaps that will hinder agent workflows.
Average 2.9/5 across 1 of 1 tools scored.
See the Tool Scores section below for per-tool breakdowns.
- No community issues in the last 6 months
- 0 commits in the last 12 weeks
- No stable releases found
- No critical vulnerability alerts
- No high-severity vulnerability alerts
- No code scanning findings
- CI is passing
This repository is licensed under MIT License.
This repository includes a README.md file.
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How is the quality score calculated?
The overall quality score combines two components: Tool Definition Quality (70%) and Server Coherence (30%).
Tool Definition Quality measures how well each tool describes itself to AI agents. Every tool is scored 1–5 across six dimensions: Purpose Clarity (25%), Usage Guidelines (20%), Behavioral Transparency (20%), Parameter Semantics (15%), Conciseness & Structure (10%), and Contextual Completeness (10%). The server-level definition quality score is calculated as 60% mean TDQS + 40% minimum TDQS, so a single poorly described tool pulls the score down.
Server Coherence evaluates how well the tools work together as a set, scoring four dimensions equally: Disambiguation (can agents tell tools apart?), Naming Consistency, Tool Count Appropriateness, and Completeness (are there gaps in the tool surface?).
Tiers are derived from the overall score: A (≥3.5), B (≥3.0), C (≥2.0), D (≥1.0), F (<1.0). B and above is considered passing.
Tool Scores
- 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 mentions returning random riddles but fails to describe key traits like rate limits, authentication needs, error handling, or the randomness mechanism. This leaves significant gaps for a tool that interacts with an external API.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness4/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is brief and front-loaded, consisting of two sentences that directly state the tool's purpose. It avoids unnecessary details, though it could be slightly more structured by explicitly mentioning the parameter or output, but overall it's efficient.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness2/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the lack of annotations and output schema, the description is incomplete. It does not explain return values, error cases, or behavioral aspects like API constraints. For a tool with external dependencies, this leaves the agent under-informed about how to use it effectively.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The schema description coverage is 100%, with the 'limit' parameter fully documented in the schema. The description does not add any meaning beyond the schema, such as explaining the impact of 'limit' on randomness or output format. Baseline 3 is appropriate as the schema handles parameter documentation adequately.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('Returns') and resource ('one or more random riddles'), specifying it's from the 'API Ninjas Riddles API endpoint'. It's specific about what the tool does, though there are no sibling tools to differentiate from, which prevents a perfect score.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5Does 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, prerequisites, or context for invocation. It lacks explicit usage instructions, such as scenarios for fetching riddles or handling the 'limit' parameter, leaving the agent without operational context.
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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