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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered, but the description adds nothing further: no indication of whether the season actually changes membership, no coverage of historical vs current teams, and no note on result size. With structured fields carrying the safety profile, the description contributes essentially nothing behavioral.

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?

A single short, front-loaded sentence with no filler. It is telegraphic rather than wasteful, though it stops short of the routing information that would justify the brevity.

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 no explanation, and the tool is simple with one optional param. Still, for an entry-point listing tool sitting among many MLB siblings, the absence of any usage or differentiation guidance leaves a real 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?

Schema description coverage is 100% and the single parameter is already documented as optional with a default of the current year, so the baseline is 3. The phrase 'for a season' merely restates the parameter and adds no format or edge-case detail beyond the schema.

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 (MLB teams) and scope (a season), so an agent knows it returns a team list rather than rosters or standings. It does not, however, explicitly distinguish itself from near siblings such as mlb_team_roster, mlb_standings, or mlb_team_stats.

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?

There is no when-to-use guidance, no mention of prerequisites, and no routing to alternatives. An agent must infer that this is the entry point for team identity data versus mlb_team_stats or mlb_team_roster.

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