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

Annotations already declare the safety profile (readOnly=false, destructive=false, idempotent=false), so the bar is lower. The description still adds valuable behavior beyond the schema: the link is ONE-TIME (matching idempotentHint=false) and the post-authorization outcome is querying accessible ad accounts. It omits link expiry, permission requirements, and what happens on re-invocation.

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?

Two short sentences with the primary action front-loaded and the follow-on capability second. Nothing is redundant or padded.

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?

With only zero parameters and an output schema that documents the returned link, the description covers the essential purpose and the downstream flow. It could go further by noting the link must be surfaced to the user for authorization and that it expires/single-use, but nothing critical is missing for invocation.

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 takes zero parameters, so per the baseline a 4 applies. There is no parameter surface for the description to compensate for, and it correctly describes the no-argument behavior (generates a link, no inputs).

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?

States a specific verb and resource ('Generates a one-time authorization link to connect a Microsoft Advertising (Bing Ads) ad account') and disambiguates from sibling connect_* tools by naming the platform. An agent can tell this apart from connect_google_ads or connect_meta_ads without opening any schema.

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 the usage context (use this to establish the connection, then you can query accounts) but never states when-not-to-use it, e.g., what to do if the account is already connected or that list_microsoft_accounts should be used afterward. No prerequisites or alternative routing are given.

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