MCP Basics

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 It states 'Execute mcp-npm-outdated: npm outdated', which implies it runs a command, but doesn't disclose traits like whether it's read-only, destructive, requires network access, has rate limits, or what the output format is. For a tool with zero annotation coverage, this is a significant gap in transparency.

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

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

The description is concise with a single sentence, but it's not front-loaded with critical information—it repeats the tool name and lacks elaboration. While efficient, it under-specifies by not explaining what 'npm outdated' does, making it less helpful than it could be with minimal additional detail.

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

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

Given no annotations, no output schema, and a simple input schema, the description is incomplete. It fails to explain the tool's behavior, output, or context, leaving gaps for an AI agent. For a command execution tool, more detail on what 'npm outdated' returns and how to interpret it would be necessary for adequate completeness.

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

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

The input schema has 1 parameter with 100% description coverage, documenting the 'directory' parameter clearly. The description adds no parameter information beyond the schema, but with high schema coverage and only one optional parameter, the baseline is high. Since the description doesn't compensate or add value, but the schema is sufficient, a score of 4 is appropriate.

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

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

The description 'Execute mcp-npm-outdated: npm outdated' states the action (execute) and command (npm outdated), which provides a basic purpose. However, it's vague about what 'npm outdated' actually does—it doesn't specify that it checks for outdated packages in a Node.js project. It distinguishes from siblings by naming the specific command, but lacks clarity on the resource or outcome.

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

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 scenarios like checking for package updates, comparing with other npm commands (e.g., npm update), or how it relates to sibling tools like mcp-npm-audit. Without any context on usage, it leaves the agent to infer based on the command name alone.

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