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

Annotations already declare readOnly, idempotent, non-destructive and openWorld, so the safety profile is covered. The description adds a genuinely useful behavioral fact beyond them: both halves of the response are nullable and a between-seasons venue is a valid state, not an error — directly preventing a false failure interpretation of a null payload.

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 tight sentences, content front-loaded (season, cohort, then freeze/close times) with the nullability caveat placed last where it reads as a guardrail. Nothing is wasted.

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 shape need not be described, and the nullability note covers the main ambiguity for a zero-param read. The only gap is routing guidance against the several sibling season/cohort tools, which is not addressed.

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?

Zero-parameter tool, so the baseline is 4. Nothing in the description is needed to clarify inputs, and it correctly adds nothing redundant.

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 names a specific resource returned: the open season, this week's scored question set, and the freeze/close times. An agent can tell this reads current season state, though the verb is implicit and it never distinguishes itself from nearby siblings like problee_get_season_cohort, problee_get_season_standings, or problee_list_scoring_cohort.

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 by 'to plan around', which suggests scheduling use, and there is no explicit statement of when to call this versus get_season_cohort or get_season_standings. No exclusions or prerequisites are given.

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