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steamyard MCP server · C · ToolBench

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steamyard

github.com/brwinnov/steamyard

STEAMYARD MCP server — Steam library ownership + DLC lookup tools, deployed on Cloudflare Workers.

2026-07-28+STREAMABLE_HTTP4 tools

66/100

Definition Quality76

Protocol Readiness82

Supportability38

Spec posture

Inferred effective spec 2026-07-28+·current baseline 2026-07-28

Static source inference · medium confidence · evidence: stateless requests, Streamable HTTP

Current-spec patterns detected

Summary

Four tools with clear verb-noun naming (get_*, compare_*, price_*) and solid descriptions (120-180 chars each). All tools have explicit input schemas with typed parameters and descriptions. However, output schemas are not documented in the visible code, and parameter descriptions lack format constraints (e.g., SteamID64 format, country code format). No tool annotations (readOnlyHint) despite all being read-only. Error handling is present but not visible in the provided code excerpt.

Tools (4)

compare-dlc-pricesread onlyauthsource verified73/100

Compare a game or DLC's current price across retailers (Steam, Fanatical, GOG, GreenManGaming, Humble, and others tracked by IsThereAnyDeal), plus historical-low windows.

get-game-dlcread onlyauthsource verified77/100

List a Steam game's DLC with release date and current price, optionally flagging each as owned/unowned for a given Steam profile.

get-owned-gamesread onlyauthsource verified77/100

Look up a public Steam profile's owned games and playtime.

price-historyread onlysource verified77/100

Get a game's all-time-low price and a buy-now-vs-wait verdict based on how the current price compares to it.

Issues (5)

HIGHtool ↗

Output schemas not documented. LLMs cannot plan downstream tool calls or extract structured data without knowing what fields to expect.

get-owned-gamesget-game-dlccompare-dlc-pricesprice-history

HIGHconstrained-input ↗

Parameter descriptions lack format constraints. 'steam_id' accepts '64-bit SteamID64, or a vanity profile name' but no regex/pattern/enum provided. 'country' defaults to 'US' but valid values not enumerated.

get-owned-gamesget-game-dlccompare-dlc-prices

MEDIUMtool ↗

No tool annotations (readOnlyHint). All four tools are read-only but lack explicit readOnlyHint=true, forcing LLMs to infer safety from descriptions.

get-owned-gamesget-game-dlccompare-dlc-pricesprice-history

MEDIUMpaginated-result ↗

No pagination parameters visible. Tools returning lists (get-game-dlc, compare-dlc-prices) should accept limit/offset and return total count to prevent context window exhaustion.

Recommendations

Document output schemas for all tools. Example for get-owned-games: {games: [{app_id: number, name: string, playtime_hours: number}], total: number}
Add enum constraints to country parameter: country: {type: 'string', enum: ['US', 'DE', 'GB', ...], description: 'Two-letter ISO country code...'}
Add readOnlyHint: true to all tool registrations since all are read-only queries
Add pagination to get-game-dlc and compare-dlc-prices: limit (1-100, default 20) and offset parameters, return total_count
Enhance steam_id parameter description with format: 'A 64-bit SteamID64 (e.g., 76561198000000000) or vanity name (e.g., gabelogannewell)'

Score history

Overall score trend

First recorded score · v2 rubric

66/100

Scored	Grade	Overall	Spec posture	Rubric
2026-09-23	C	66	2026-07-28+	v2