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rexlManu

League of Legends MCP Server

by rexlManu

LoL get builds for champion

lol_get_builds_for_champion

Scrape Lolalytics to find optimal builds, runes, counters, and meta data for any League of Legends champion.

Instructions

Scrape Lolalytics for best builds, runes, counters, and meta data for a champion

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
laneNoLane: top, jungle, mid, adc, support
rankNoRank: iron, bronze, silver, gold, plat, diamond, master, grandmaster, challenger, all
patchNoPatch version (default: current)
regionNoRegion: world, na, euw, eune, kr, br, lan, las, oce, ru, tr, jp
championYesChampion name (e.g. 'Ahri', 'Lee Sin')
Behavior2/5

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

No annotations provided, so the description must disclose behavior. It mentions scraping Lolalytics but does not explain if results are cached, real-time, or rate-limited. It also omits side effects, authentication needs, or response format.

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?

Single sentence, no unnecessary words, front-loaded with key action and resource. Efficient.

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?

For a scraping tool with no output schema, the description should explain return structure or limitations (e.g., patch dependency). It lacks this context, leaving the agent underinformed.

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%, with each parameter having a description. The tool description adds no extra meaning beyond what the schema provides, so baseline 3 is appropriate.

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 scrapes Lolalytics for builds, runes, counters, and meta data, using a specific verb and resource. It distinguishes from sibling tools that focus on other LoL data, like champion info or match details.

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 guidance on when to use this tool vs. alternatives like 'lol_get_champ_info' or 'lol_get_all_champions'. The description does not mention prerequisites, preferred scenarios, or when not to use it.

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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