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

Annotations already declare readOnlyHint=true, openWorldHint=false, and idempotentHint=true, covering the safety profile. The description adds no behavioral details beyond the return fields (status, last sync, error), which is not behavioral transparency per se. It does not contradict annotations and provides minimal extra context, so 3 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?

The description is a single, front-loaded sentence that efficiently states the resource, examples, and return fields. There is no filler or redundant information.

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?

For a simple read-only tool with one parameter and no output schema, the description covers the action, resource, and return content (status, last sync, error). It does not mention pagination or error handling, but given the low complexity and annotation coverage, this is 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 description coverage is 100%: site_id is fully described as 'The site id, as returned by list_sites.' The description adds no additional parameter semantics, so it does not enhance the schema. Baseline of 3 is correct.

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 verb 'List' and the resource 'data connections of a website', naming specific connection types (Search Console, Analytics, Ads, ChatGPT Ads) and the returned data (status, last sync, error). It is specific enough to distinguish from siblings like get_site_metrics or get_keywords, though it does not explicitly name an alternative.

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?

Usage context is only implied: the tool lists connections for a site, so an agent would use it when needing connection status. The schema description adds the prerequisite that site_id must come from list_sites, but there is no explicit when-to-use or when-not-to-use guidance, nor any mention of alternatives.

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