_fetch_stars_for_user

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

No annotations provided, so description must fully disclose behavior. It reveals token purpose and default, but the 'update' aspect is unclear—could imply mutation without warning about side effects. No mention of rate limits, errors, or output format.

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?

Description is brief (4 lines), includes args list, front-loaded purpose. No wasted words, though 'Args' section is slightly redundant given schema.

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?

Tool is simple (2 params, sibling, output schema exists). Description covers basic usage but lacks clarity on side effects (update vs fetch) and does not fully compensate for missing annotations.

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 has 0% description coverage, so description compensates by detailing both parameters: username (exact, example) and token (optional, purpose, default). Adds moderate value beyond schema stubs.

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 states 'fetch or update the database of starred repositories', which gives a clear verb and resource, but the dual nature (fetch or update) is ambiguous. Does it always update? Does it only fetch? The sibling 'search_stars' suggests a search function, but no explicit differentiation.

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?

Minimal guidance: only mentions 'for a specific GitHub username'. No context on when to use this versus search_stars, no prerequisites or exclusions.

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