Reddit Thread

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

No annotations provided, so description carries full burden. It states the tool fetches and returns 'compact post details plus top comments,' which is basic behavioral info. However, it omits critical details like authentication needs, rate limits, or side effects. Adequate but minimal.

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 sentence that efficiently conveys the main action and result. It is front-loaded with the verb and resource. Could be slightly more structured but effective.

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 absence of an output schema, the description should fully explain the return format. 'Compact post details plus top comments' is vague—what details? In what format? Also, with 4 parameters, the description does not clarify parameter behaviors or interactions. Incomplete for a fetch tool.

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 coverage is 100% with parameter descriptions. The description does not add additional meaning beyond the schema. For example, it doesn't explain the relationship between 'top_comments' and 'comment_limit' or clarify defaults. Baseline score applies.

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 verb 'Fetch' and the resource 'one Reddit thread' with specific identification methods (URL or post id). It distinguishes from sibling tools like reddit_search (search) and reddit_subreddits (subreddit info) by focusing on a single thread.

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 when needing details of a specific thread but provides no explicit guidance on when to use or avoid this tool versus alternatives. No comparisons to siblings, leaving the agent to infer context.

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