List search time filters

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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is fully covered. The description adds only that a table of codes and meanings is returned, which is minor additional context beyond the annotations and output schema.

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 first two sentences are largely redundant ('List available time range filters' vs 'Shows all time range options'), and the explicit 'Returns:' line duplicates information the output schema already provides. It is short but not tightly front-loaded.

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-parameter listing tool with a full output schema and clear annotations, the description supplies enough context to invoke it correctly, though the redundant returns statement leaves a little to trim rather than an actual gap.

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 the baseline of 4 applies. There is nothing for the description to compensate for at the parameter level.

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 ('List available time range filters for Google search'), which is clear and distinct from sibling tools such as serp_list_search_types, serp_list_countries, or serp_list_languages. It does not, however, explicitly contrast itself with those siblings beyond the differing resource noun.

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 is only implied: the description says the options 'can be used to filter results by date,' suggesting this is a discovery/lookup call, but it never states when to call it or when another tool is preferable. No prerequisites or sequencing guidance is given.

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