PubMed 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 single tool clearly handles all PubMed operations, so an agent cannot misselect between multiple options.
Naming Consistency5/5The single tool name 'pubmed_articles' follows a clear noun-based pattern, and since there is only one tool, consistency is inherently perfect with no deviations or mixed conventions to evaluate.
Tool Count2/5A single tool for a comprehensive biomedical database like PubMed is too few for the apparent scope. The tool description suggests multiple operations (search, retrieve, download), which would typically be split into distinct tools for better agent usability and clarity, making this count inappropriate.
Completeness4/5The tool claims to cover search, retrieval, and PDF download operations, which addresses core PubMed use cases. However, the reliance on a single tool with a 'method parameter' for different operations may introduce gaps in agent handling, as it lacks dedicated tools for specific actions like filtering or metadata updates, but it is largely complete for basic workflows.
Average 3.1/5 across 1 of 1 tools scored.
See the Tool Scores section below for per-tool breakdowns.
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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. While it mentions accessing 'over 35 million citations' and downloading PDFs 'when available,' it lacks critical behavioral information such as rate limits, authentication requirements, error conditions, response formats, or whether operations are read-only or mutative. For a tool with 10 parameters and no annotations, this is a significant gap.
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 appropriately sized with three sentences that are front-loaded: it starts with the unified purpose, adds context about the database, and ends with usage instructions. There's minimal waste, though the second sentence about '35 million citations' could be considered slightly extraneous. Overall, it's efficient and well-structured.
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 tool's complexity (10 parameters, multiple operations) and lack of both annotations and an output schema, the description is incomplete. It doesn't explain what the tool returns (e.g., search results format, metadata structure, PDF handling), behavioral constraints, or error scenarios. For a multi-function tool with no structured output documentation, the description should provide more operational context.
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?
Schema description coverage is 100%, so the schema already documents all parameters thoroughly. The description adds some value by mentioning the 'method parameter' and listing the four operation types, but it doesn't provide additional semantic context beyond what's in the schema descriptions. The baseline of 3 is appropriate when the schema does the heavy lifting.
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 tool's purpose as a 'unified tool for PubMed operations' that can 'search biomedical literature, retrieve article metadata, and download PDFs.' It specifies the resource ('PubMed articles') and multiple verbs, but since there are no sibling tools, it doesn't need to differentiate from alternatives. The description goes beyond a tautology by explaining the scope and database size.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines3/5Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides implied usage guidance by stating 'Use the method parameter to specify the operation type' and listing the four available methods. However, it doesn't explicitly state when to choose one method over another (e.g., when to use search_keywords vs search_advanced) or mention any prerequisites or constraints. With no sibling tools, alternative guidance isn't needed.
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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