Diablo IV Calculator MCP

Public, no-auth-required* MCP server exposing deterministic Diablo IV calculators. Anyone can connect — a fresh anonymous user id is minted on first connection for rate-limit accounting only.

*Auth uses OAuth 2.1 + PKCE because Claude.ai connectors require it, but consent is auto-approved. No email, no allowlist, no account to manage.

Tools

• compute_dps — bucket-model DPS for a build snapshot
• armor_breakpoint — armor needed for a DR target
• glyph_xp_time — NMD runs to level a glyph
• recipe_cost — Horadric Cube material totals
• bucket_compare — pick the bigger multiplier between two upgrades
• lookup_item — item details + legendary affix descriptions with value ranges
• affix_pool — rollable stats for a class/item type
• d4_query — analytical queries across 7 game data tables

Add to Claude Code

claude mcp add --transport http d4-calc https://mcp-d4.anashel.com/

Add to Claude.ai (web/desktop)

Settings → Connectors → Add custom connector → paste: https://mcp-d4.anashel.com/

Endpoints

• POST / — MCP JSON-RPC (requires Bearer token)
• GET /.well-known/oauth-protected-resource — RFC 9728
• GET /.well-known/oauth-authorization-server — RFC 8414
• POST /oauth/register — RFC 7591 dynamic client registration
• GET/POST /oauth/authorize — consent flow (auto-approves)
• POST /oauth/token — code/refresh exchange
• POST /oauth/revoke — RFC 7009
• GET /health — liveness

Limits

• 60 calls per minute per user
• Hard ceiling at the edge via Cloudflare rate limit binding

Not affiliated with Blizzard Entertainment. Game data and calculations are best-effort approximations; verify against current-patch guides.