Amazing Marvin MCP

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

No annotations are provided, so the description carries full burden. It explains the basic purpose and related operations but doesn't disclose important behavioral traits like whether starting tracking requires specific permissions, what happens if tracking is already active for another task, rate limits, or error conditions. It adds some context about checking status first but lacks comprehensive behavioral details.

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 perfectly structured with three sentences that each serve distinct purposes: stating the core function, providing usage context, and listing related tools. Every sentence earns its place with zero wasted words, and information is front-loaded appropriately.

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 that an output schema exists (so return values don't need explanation), the description provides good context about when to use the tool and related operations. However, for a mutation tool with no annotations and 0% schema coverage, it should ideally explain more about the task_id parameter format and behavioral implications of starting time tracking.

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?

With 0% schema description coverage for 2 parameters, the description doesn't add any parameter-specific information beyond the schema. It mentions 'task_id' in the context but doesn't explain what format it expects or what the 'debug' parameter does. The description doesn't compensate for the schema's lack of parameter documentation.

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 ('Start time tracking') and resource ('for a specific task'), distinguishing it from sibling tools like stop_time_tracking, get_currently_tracked_item, and time_tracking_summary. It uses precise verbs and identifies the exact scope of operation.

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 it ('Use when beginning focused work on a task to measure time spent') and provides clear alternatives for checking status (get_currently_tracked_item, time_tracking_summary) and stopping (stop_time_tracking). It gives complete context for tool selection.

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