get_chess_player_profile

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

With no annotations, the description carries the full burden of behavioral disclosure. Saying 'public' hints that no auth is needed, but it does not describe what happens for invalid usernames, rate limits, or the structure of the response. This is a minimal description with no added behavioral context.

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, front-loaded sentence that immediately conveys the core action and target. It contains zero waste and is appropriately sized for the tool's simplicity.

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?

The tool is simple (one parameter), but with no output schema and no annotations, the description alone should convey what information the agent can expect. 'Public profile' hints at content, but lacks specifics such as whether it returns basic details like name, avatar, or join date. This leaves a noticeable gap between the description and the tool's practical use.

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 includes 'by username', which clarifies that the 'username' parameter is the Chess.com identifier. However, schema coverage is 0% and no further format or constraints (e.g., case sensitivity, URL encoding) are specified, so it adds only basic meaning.

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 a specific verb ('Get') and a specific resource ('public profile for a Chess.com player by username'). It naturally distinguishes itself from the sibling tool 'get_chess_player_stats' by focusing on 'profile' rather than 'stats'.

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 get_chess_player_stats. There is no mention of scenarios, exclusions, or prerequisites, so the agent receives no decision support beyond the inherent meaning of 'profile' vs 'stats'.

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