Amazing Marvin MCP

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states the action but doesn't explain what 'starting time tracking' actually does: Does it create a record? Does it affect task status? Is there a limit to concurrent tracking? What permissions are needed? These critical behavioral aspects are missing.

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 with no wasted words. It's appropriately sized for a simple tool and gets straight to the point without unnecessary elaboration.

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, no output schema, and 0% schema description coverage, the description is insufficient. It doesn't explain what the tool returns, what side effects occur, or how it interacts with other time-tracking tools. Given the sibling tools and complexity of time-tracking systems, more context is needed.

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?

Schema description coverage is 0%, so the description needs to compensate but doesn't. It mentions 'task_id' implicitly ('for a specific task') but provides no details about format, validation, or where to obtain valid task IDs. The single parameter remains undocumented beyond its existence.

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 ('Start time tracking') and the target ('for a specific task'), providing a specific verb+resource combination. However, it doesn't distinguish this tool from sibling 'stop_time_tracking' or explain what 'time tracking' entails in this system.

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?

No guidance is provided about when to use this tool versus alternatives like 'stop_time_tracking' or 'get_currently_tracked_item'. The description doesn't mention prerequisites (e.g., whether a task must exist or be in a particular state) or what happens if time tracking is already active for another task.

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