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

Since no annotations are provided, the description carries the full burden. It discloses that the tool uses a public endpoint and requires no auth, and it explains what is returned. It does not mention potential rate limits or destructive behavior, but the read-only nature is implied.

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 very concise with two sentences that front-load the action and then provide specifics. No extraneous words or redundancy.

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 simple input (one URL parameter) and no output schema, the description is fairly complete. It covers purpose, return values, and authentication. It could mention that it returns URLs rather than files, but that is clear. It lacks information on limits, but for a basic tool it's adequate.

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%, so baseline is 3. The description does not add extra semantic information about the parameter beyond what the schema provides (URL format). The description focuses on output, not parameter details.

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 tool downloads an X post, lists the content types (video, GIF, images, article), and mentions returned data (media URLs, author info, engagement stats). It is distinct from siblings which are for search URLs, calculations, etc.

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 specifies that no authentication is required, which guides usage. It does not explicitly state when to use this tool versus alternatives, but the sibling tools do not overlap in functionality, so the context is clear.

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