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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false. The description adds that it returns an OAuth URL, which is consistent but not deeply beyond annotations. It doesn't disclose additional behaviors like URL expiration or browser redirect steps, but with annotations covering the safety profile, a mid-score is appropriate.

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 sentence, front-loaded with the action, no unnecessary words. Every word earns its place. Perfectly concise.

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 tool's simplicity (no parameters, no output schema), the description is largely complete: it states the output (OAuth URL) and the purpose. Minor context missing about post-authorization flow, but not essential for such a straightforward tool. Slight deduction for not mentioning that the URL is for user-facing authentication, but still 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?

The tool has zero parameters, so the description need not add parameter meaning. Baseline is 4 as per rubric for 0 params; the description focuses on the action and result, which is sufficient.

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 ('Get') and resource ('OAuth URL to connect your X account'), clearly distinguishing this from sibling connect_* tools for other platforms. It fully states what the tool does with no ambiguity.

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 connecting an X account, but does not explicitly state when to use this versus the many sibling connect_* tools or any exclusions. The platform is named, so context is clear, but no explicit guidance or alternatives are mentioned.

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