fetch_tweet

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Summarize details' is vague and doesn't specify what information is returned, whether it includes the full post content, or any rate limits or authentication requirements. This lack of detail leaves significant ambiguity.

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 is immediately informative and contains no filler. It is appropriately concise for the simple one-parameter tool.

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 lack of output schema and annotations, the description should explain what the 'summary' contains and what the output looks like. It does not, leaving the agent uncertain about the tool's return value and edge cases. The description is too minimal to be considered complete.

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 schema has only a 'url' parameter with no description. The tool description clarifies that this URL is an X post URL, adding some meaning. However, it doesn't specify the expected format (e.g., full URL versus ID) or validate the input, so it only partially compensates for the 0% schema description coverage.

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 uses a specific verb ('Fetch and summarize') and clearly identifies the resource ('one X post URL'). It distinguishes from sibling tools like search_tweets and get_trends by focusing on a single URL rather than searches or trends.

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 phrase 'for one X post URL' implies that this tool is used when you already have a specific post URL, as opposed to searching for posts. However, it does not explicitly mention alternatives or state when not to use it, so the guidance is implied rather than explicit.

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