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

Annotations already declare readOnly/idempotent/non-destructive, so the bar is lower; the description still adds real value by disclosing the account scoping and the failure mode ('returns teams_not_persisted' when no account). It does not say what an empty-but-authenticated account returns, which is the remaining 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?

Two sentences, zero filler, with the primary behavior front-loaded and the edge case second. Nothing restates the annotations or the title verbatim.

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 zero-required-param read-only list tool with full annotation coverage and no output schema, this is nearly complete: scope, returned content, and the no-account error are all covered. Only the empty-list case and any ordering guarantee are unstated.

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 single parameter is fully documented in the schema and is host-populated rather than LLM-supplied, so the description need not cover it. Per the high-coverage baseline this lands at 3 — the description adds nothing about parameters, but nothing is needed either.

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 ('Lists homepage Saved groups for the signed-in Google account') and previews the returned content ('exact names'). The only friction is terminology: the tool is named list_teams and siblings use 'team', while the description says 'Saved groups' — a minor mapping the agent must infer.

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 scoping to the signed-in account implicitly separates it from get_team (single team) and save_team/delete_team/rename_team (mutations), but no sibling or alternative is named explicitly. The agent can infer 'use this to enumerate' but is not told when not to use it.

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