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

Annotations cover the safety profile (readOnly=false, destructive=false, idempotent=false). The description adds meaningful behavior beyond them: the dry-run/apply semantics of confirm and the hard prerequisite on uet_tag_id. It omits that non-idempotent calls may create duplicates on retry, a minor gap.

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?

Front-loaded with the core action and the critical required-parameter warning, then value sets and the confirm semantics. Dense and terse with zero filler, though the enum listings make it feel slightly crammed rather than cleanly structured.

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 an output schema present, return values need not be described. The description covers the create intent, the prerequisite, and the preview/apply mechanics. A few parameters remain undescribed, but for a 9-param tool with an output schema this is close to sufficient.

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 description coverage is 0%, so the description must carry the load. It documents operator and goal_category value sets, gives a url_expression example, and explains confirm, but leaves name, account_id, customer_id, and revenue_value completely unspecified. Useful but incomplete compensation.

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 ('Creates a URL-based conversion goal'), which distinguishes it from sibling listing/update tools and from create_microsoft_uet_tag. It does not explicitly contrast with update_conversion_goal or create_meta_custom_conversion, but the URL-based Microsoft framing is specific enough for confident selection.

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?

Provides the key prerequisite routing: uet_tag_id is REQUIRED and instructs to first run create_microsoft_uet_tag or list_microsoft_uet_tags. It also explains the confirm=false preview vs confirm=true apply fork. No explicit when-not-to-use guidance, but the dependency chain is spelled out.

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