Amazing Marvin MCP

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the action ('stop time tracking') but doesn't describe what happens upon invocation (e.g., whether it returns data, logs time, or updates task status), potential side effects, error conditions, or authentication needs. This is inadequate for a mutation tool with zero annotation coverage.

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 front-loads the core action. There is no wasted verbiage or redundancy, making it highly concise and well-structured for quick comprehension.

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, the description doesn't need to explain return values. However, for a mutation tool with no annotations, 0% schema coverage, and 2 parameters, the description is too minimal—it lacks behavioral context, parameter details, and usage guidelines, leaving the agent under-informed despite the output schema.

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 must compensate but adds no parameter information. It mentions 'a specific task' which hints at 'task_id', but doesn't explain the 'debug' parameter or provide any details on format, constraints, or usage. With 2 parameters and no schema descriptions, this leaves significant gaps.

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 verb ('stop') and resource ('time tracking for a specific task'), making the purpose unambiguous. It distinguishes from siblings like 'start_time_tracking' by specifying the opposite action, though it doesn't explicitly differentiate from all other time-related tools like 'time_tracking_summary' or 'get_time_tracks'.

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), exclusions, or relationships with siblings like 'start_time_tracking' or 'get_currently_tracked_item'. The agent must infer usage from context alone.

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