CTFtime MCP Server

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

No annotations are provided, so the description carries the full burden. It states the tool retrieves a calendar view, implying a read-only operation, but doesn't disclose behavioral traits such as authentication requirements, rate limits, error handling, or whether the data is cached. For a tool with no annotation coverage, this leaves significant gaps in understanding its operational characteristics.

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 concise, with zero wasted sentences. It front-loads the purpose, followed by clear sections for arguments and returns. Each sentence earns its place by providing essential information without redundancy, making it easy to parse quickly.

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's low complexity (2 optional parameters) and the presence of an output schema (which handles return values), the description is reasonably complete for basic use. However, with no annotations and incomplete parameter guidance (e.g., no mention of null defaults behavior), it lacks depth for more advanced scenarios, making it adequate but with clear gaps.

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 adds meaningful semantics beyond the input schema, which has 0% description coverage. It explains that 'month' is a number 1-12 with a default of current month, and 'year' has a default of current year—details not in the schema. With 2 parameters and low schema coverage, the description effectively compensates by clarifying usage and defaults, though it could note that null values trigger defaults.

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: 'Retrieve CTF events calendar for a specific month.' It specifies the verb ('retrieve') and resource ('CTF events calendar'), and distinguishes it from siblings like 'get_upcoming_ctfs' or 'search_events' by focusing on a calendar view for a specific month. However, it doesn't explicitly differentiate from 'get_past_ctfs' or 'get_event_details' beyond the calendar format.

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 mentions retrieving a calendar for a specific month, but doesn't clarify scenarios like 'use this for a monthly overview' versus 'use get_upcoming_ctfs for future events' or 'use search_events for filtering by criteria.' There's no mention of prerequisites, exclusions, or comparisons to sibling tools.

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