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. It mentions the tool 'Consolidates multiple data sources efficiently' which adds useful context about its aggregation behavior. However, it doesn't describe important behavioral aspects like whether this is a read-only operation, what authentication might be required, rate limits, or what happens when no data is available. The description provides some behavioral context but leaves significant gaps.

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 well-structured and appropriately sized with three distinct paragraphs serving different purposes: purpose statement, usage guidance, and alternative tools. Every sentence adds value, though the second paragraph could be slightly more concise by combining the first two sentences. Overall, it's efficiently written with good front-loading of key information.

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 the tool has an output schema (which handles return values), no annotations, and only one simple parameter, the description provides good contextual completeness. It clearly explains the tool's purpose, when to use it, and alternatives. The main gap is the lack of behavioral details that would be important for a productivity overview tool (like whether it shows real-time data or cached information).

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 input schema has only one parameter ('debug') with 0% schema description coverage, meaning the schema provides no semantic information about this parameter. The description doesn't mention any parameters at all, which is acceptable given there's only one optional boolean parameter. A baseline of 4 is appropriate for a tool with zero required parameters, though ideally the description would briefly explain what 'debug' mode does.

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 tool's purpose with specific verbs ('Get comprehensive daily productivity overview') and resources ('today's tasks, overdue items, completed items, and planning insights'). It explicitly distinguishes this tool from siblings by listing alternative tools for specific data needs, making it clear this is a consolidated view tool.

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 explicit guidance on when to use this tool ('Primary tool for daily planning and productivity', 'Use when you need a complete view of today's work situation') and when to use alternatives ('For specific data only, use: get_tasks()...'). It names specific sibling tools for different use cases, offering clear alternatives.

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