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Praetorium

Praetorium is a free, open source Warhammer 40,000 army builder, combat simulator and battle tracker.

Ask your AI about any faction's units, points, detachments, enhancements, stratagems and missions, and get answers with links to the matching Praetorium page. Compare two units with Praetorium's combat simulator to see expected casualties and the odds of destroying the target.

What you can ask

Search the verified reference and answer with source URLs without guessing.
Example path →

MCP connector

Server URL: https://praetorium.gg/mcp
Login: API key
Protocol: MCP 2025-11-25
Instructions: Praetorium is a free and open source Warhammer 40,000 army builder, combat simulator and battle tracker. Public reference tools work without signing in. Account tools require OAuth sign-in; read and write access have separate scopes. Use to discover factions, rule documents, mission packs, kinds, and the active snapshot. For roster planning, call once with the faction, battle size, and optional detachment to get unit-size costs, composition, attachments, limits, and detachment rules instead of reading every datasheet. To compare two units in combat, call with unit ids from instead of calculating odds yourself; report refused or notCalculated rules rather than estimating them. Use to find a record by name or number, then or before answering. Fetch the textSources URLs when the answer depends on a rule’s exact wording. Use faction, pack, and document filters when names or rule numbers are ambiguous. Cite the canonical URL and preserve the result attribution. Say when the source does not provide an answer. Praetorium returns names, numbers, points, and computed results, never rules text. A record or section that withholds rules text lists textSources: the pinned upstream file, its source, and the record id to find in it. Fetch that file yourself if you need the wording. Missing, conflicting, or unavailable source facts remain explicit. They must not be repaired or guessed from model memory.

Tools

Reads data11

Deletes or can't be undone4

Skills

None in the store listings or on the server

MCP connector

Server URL

https://praetorium.gg/mcp

API key

Protocol

MCP 2025-11-25

Instructions

Praetorium is a free and open source Warhammer 40,000 army builder, combat simulator and battle tracker. Public reference tools work without signing in. Account tools require OAuth sign-in; read and write access have separate scopes. Use to discover factions, rule documents, mission packs, kinds, and the active snapshot. For roster planning, call once with the faction, battle size, and optional detachment to get unit-size costs, composition, attachments, limits, and detachment rules instead of reading every datasheet. To compare two units in combat, call with unit ids from instead of calculating odds yourself; report refused or notCalculated rules rather than estimating them. Use to find a record by name or number, then or before answering. Fetch the textSources URLs when the answer depends on a rule’s exact wording. Use faction, pack, and document filters when names or rule numbers are ambiguous. Cite the canonical URL and preserve the result attribution. Say when the source does not provide an answer. Praetorium returns names, numbers, points, and computed results, never rules text. A record or section that withholds rules text lists textSources: the pinned upstream file, its source, and the record id to find in it. Fetch that file yourself if you need the wording. Missing, conflicting, or unavailable source facts remain explicit. They must not be repaired or guessed from model memory.