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dingyiyi0226

Yahoo Fantasy Baseball MCP Server

by dingyiyi0226

Get league transactions

get_transactions
Read-only

Get recent transactions such as adds, drops, and trades in a fantasy baseball league. Optionally filter by team to view one team's transactions.

Instructions

Get recent transactions (adds, drops, trades) in a league. Pass teamKey to filter to a single team's transactions.

Input Schema

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

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

Annotations already declare readOnlyHint=true, so the description adds only that transactions are 'recent'. This is vague but sufficient given the read-only indication.

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 the main purpose, no unnecessary words. Highly concise and well-structured.

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

Completeness2/5

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

No output schema exists and the description does not explain what the returned transactions look like (fields, ordering, limit). Lacks sufficient detail for an agent to fully understand usage.

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 description adds no new info beyond what the schema says about the parameters (teamKey filter is already described). Baseline 3 applies.

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

Purpose4/5

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

Clearly states the tool gets recent transactions (adds, drops, trades) in a league. No sibling tool directly overlaps, so it distinguishes itself well.

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

Usage Guidelines2/5

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

No explicit guidance on when to use this tool versus alternatives. It mentions filtering by teamKey but does not advise on scenarios or exclude any use cases.

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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