list_properties

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds genuinely non-obvious behavior: that the first data call may open a browser OAuth flow, and that page_size counts GA accounts (not properties), each account carrying its propertySummaries. Pagination semantics are disclosed via 'follow nextPageToken until null'.

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?

Three short sentences, front-loaded with the purpose, then pagination, then parameter/auth notes. Nothing is padded, though the stray blank line and telegraphic fragment style make it slightly harder to scan than a single tight paragraph would be.

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?

An output schema exists, so return values need not be described, and annotations cover the safety profile. Given only 3 optional parameters and this being a read-only discovery call, the description supplies what's actually needed: auth behavior, pagination loop, and the account/page_size units. Only the page_token/npageToken naming mismatch and the unstated default keep it from complete.

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?

With 0% schema description coverage, the description carries the full burden and mostly does: account is explained as a local Google-login alias (and is optional), page_size is bounded 1–200 with a clear unit of counting, and pagination via token is described. Minor gap: it uses 'nextPageToken' (the response field) rather than the actual parameter name page_token, requiring the agent to map between the two, and it never states the page_size default of 50.

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 opening sentence gives a specific verb+resource ('List accessible GA accounts and properties'), and the annotations reinforce it with the title 'List GA4 properties'. It is clear what the tool returns, though it never names get_property as the singular alternative, so the distinction between discovery and per-property reads is left implicit.

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 implied rather than stated: the pagination instruction ('Follow nextPageToken until null') tells an agent how to consume results, and the OAuth note explains what happens on the first call. However, there is no explicit 'use this instead of get_property when...' routing guidance among 16 siblings, which an agent facing get_property/list_properties would benefit from.

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