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dingyiyi0226

Yahoo Fantasy Baseball MCP Server

by dingyiyi0226

Get team roster

get_roster
Read-only

Retrieve a fantasy baseball team's roster for any date, with optional player details or just player keys.

Instructions

Get a team's roster for a date. By default, each player row contains player_key, name, editorial_team_abbr, display_position, selected_position, status, and is_starting. Set keyOnly=true to return only the player_key array.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dateNoDate as YYYY-MM-DD; defaults to today
keyOnlyNoReturn only an array of player_key values
teamKeyNoTeam key; defaults to configured team
Behavior4/5

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

Annotations provide readOnlyHint, and description adds details about default output fields and the effect of keyOnly=true, going beyond annotations without contradicting them.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with purpose and default output, then a succinct addition about an option. No unnecessary words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema, but description covers default return fields and keyOnly mode. Lacks mention of prerequisites like authorization, but sibling tools indicate a separate auth process.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, and description adds context: date defaults to today, teamKey defaults to configured team, and keyOnly behavior is explained fully.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states it gets a team's roster with specific verb and resource. It lists default fields and a key only option, distinguishing it from sibling tools like get_roster_stats or get_team.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No explicit guidance on when to use this vs. siblings. Usage is implied by the name and description, but alternatives like analyze_roster_stats or get_roster_stats are not compared.

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

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