cachly-mcp-server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes what the tool does (checks API health and auth status), what it returns (JWT validity, user ID, token expiry, auth provider), and its use case (debugging/verification). However, it doesn't mention potential side effects, rate limits, or error conditions, which keeps it from a perfect score.

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 efficiently structured in two sentences: the first states the tool's purpose and return values, and the second provides usage guidelines. Every sentence adds essential information without redundancy, making it front-loaded and appropriately sized for a zero-parameter tool.

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 the tool's low complexity (0 parameters, no annotations, no output schema), the description is largely complete. It explains the purpose, usage, and return values. However, without an output schema, it could benefit from more detail on the exact format of the returned data (e.g., structured JSON vs. plain text), which prevents a perfect score.

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 0 parameters with 100% coverage, so the baseline is 4. The description adds value by confirming no parameters are needed ('Check the cachly API health...' implies a parameterless operation) and explaining the context for its use, which aligns with the empty schema.

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 clearly states the tool's purpose with specific verbs ('Check', 'debug', 'verify') and resources ('cachly API health', 'authentication status', 'JWT validity', 'user ID', 'token expiry', 'auth provider'). It distinguishes itself from sibling tools by focusing on API health and authentication verification rather than cache operations, instance management, or learning functions.

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 explicitly states when to use this tool: 'to debug connection issues or verify your CACHLY_JWT is correct.' This provides clear guidance on its intended context (troubleshooting and verification) without needing to mention alternatives, as no other sibling tools appear to serve this specific diagnostic purpose.

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