mcp-server-devutils

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. While it states the conversion function, it doesn't mention error handling (e.g., invalid ISO strings), timezone considerations, precision (seconds/milliseconds), or what happens with edge cases like leap seconds. For a data transformation tool, these behavioral aspects are important but undocumented.

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 a single, efficient sentence that communicates the core functionality without any wasted words. It's appropriately sized for a simple conversion tool and front-loads the essential information immediately.

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?

For a simple single-parameter conversion tool with no annotations and no output schema, the description adequately covers the basic purpose. However, it lacks details about return format, error conditions, and behavioral nuances that would be helpful given the absence of structured metadata. The description is minimally complete but could provide more context.

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 schema description coverage is 100%, with the single parameter 'date' fully documented in the schema as 'ISO 8601 date string'. The description adds no additional parameter information beyond what's already in the schema, so it meets the baseline score of 3 for high schema coverage without adding extra value.

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 specific action ('Convert') and the resource transformation ('ISO 8601 date string to Unix timestamp'). It precisely distinguishes this tool from sibling tools like 'timestamp_to_iso' (which performs the inverse operation) and 'timestamp_now' (which generates current timestamp).

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 implicitly provides usage context by specifying the input format ('ISO 8601 date string') and output type ('Unix timestamp'), which helps determine when to use this tool. However, it doesn't explicitly state when to use this versus alternatives like 'timestamp_to_iso' or mention any prerequisites or exclusions for usage.

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