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dingyiyi0226

Yahoo Fantasy Baseball MCP Server

by dingyiyi0226

Get league transactions

get_transactions
Read-only

Retrieve recent adds, drops, and trades in your Yahoo Fantasy Baseball league. Filter by team to see specific transactions.

Instructions

Get recent adds, drops, and trades in a league. Pass teamKey to filter them.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
teamKeyNoFilter to this team's transactions
leagueKeyNoLeague key; defaults to configured league
Behavior3/5

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

The description adds no behavioral details beyond the readOnlyHint annotation. It mentions 'recent' but does not define the recency bounds or other behavioral traits.

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?

The description is two sentences long, front-loaded with purpose, and contains no filler.

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?

For a simple read tool with only two optional parameters and no output schema, the description adequately covers purpose and filtering. However, it could define 'recent' or mention return type.

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

Parameters3/5

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

Schema coverage is 100%, and the description's hint about teamKey filtering adds little beyond the schema's own description.

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?

The description clearly states the tool retrieves 'recent adds, drops, and trades in a league,' specifying the verb and resource. This distinguishes it from sibling tools like get_roster 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 Guidelines4/5

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

It mentions 'Pass teamKey to filter them,' providing clear context for when to use the filter. However, it does not specify when not to use the tool or offer alternatives.

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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