Amazing Marvin MCP

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 'stop' implies a mutation operation, it doesn't specify what happens when invoked (e.g., does it save accumulated time, trigger notifications, or update task status?). It also doesn't mention error conditions, permissions needed, or what the response looks like.

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 states the core purpose without unnecessary words. It's appropriately sized for a simple tool with one parameter and gets straight to the point.

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 mutation tool with no annotations and no output schema, the description is insufficient. It doesn't explain what happens after stopping time tracking, what data is returned, or potential side effects. Given the sibling tools include time tracking operations, more context about the workflow would be helpful.

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 description mentions 'for a specific task' which aligns with the single 'task_id' parameter, but with 0% schema description coverage, it doesn't add meaningful details about parameter format, constraints, or where to obtain valid task IDs. The baseline is 3 since the schema fully documents the parameter structure despite lacking descriptions.

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 action ('stop time tracking') and the target resource ('for a specific task'), which provides a specific verb+resource combination. However, it doesn't differentiate from the sibling tool 'start_time_tracking' beyond the obvious action difference, missing an opportunity to clarify the relationship between these complementary tools.

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 prerequisites (e.g., that time tracking must be active for the task), when not to use it, or how it relates to sibling tools like 'start_time_tracking' or 'get_currently_tracked_item'.

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