Get public Duolingo profile

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

No annotations provided, so description is the sole source. It discloses the fetched data types (profile, streak, XP, courses) but does not mention any side effects, error behavior (e.g., on missing username), rate limits, or that the data is public and requires no authentication. Behavioral traits like 'only public data' are implied but not explicitly stated.

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?

One clear sentence that states the action and what is fetched. It is concise but could be slightly more efficient by removing the word 'public' since it's in the tool name. No wasted words, but front-loading is adequate.

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?

No output schema exists, so description should explain return values. It lists key return items (profile, streak, XP, courses) but is vague on format or additional metadata. For a simple fetch tool with 1 parameter, it is moderately complete but leaves questions about structure.

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 100% (the only parameter 'username' has a description). The tool description adds 'Defaults to DUOLINGO_USERNAME' which is already in the schema description. No additional meaning beyond what the schema provides, so baseline score of 3 is appropriate.

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?

Description clearly states verb 'Fetch' and resource 'public Duolingo profile, streak, total XP, and courses by username.' It distinguishes from siblings like 'duolingo_get_authenticated_profile' (which requires auth) and 'duolingo_get_xp_summaries' (which focuses on XP). The purpose is specific and unambiguous.

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 implies usage for fetching public profile by username but provides no explicit guidance on when to use vs alternatives (e.g., when to choose this over duolingo_get_authenticated_profile or duolingo_today_status). No when-not-to-use conditions are mentioned.

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