MythxEngine

Generate monsters based on the world seed. Returns a prompt for LLM execution.

Generate narrative guidance (opening scenes, plot hooks, conflicts) based on the world seed. Returns a prompt for LLM execution.

Generate NPCs based on the world seed. Returns a prompt for LLM execution.

Generate the core rulebook. Returns cached path if exists, or a prompt for LLM execution if generation is needed.

Generate situations (nodes) based on the world seed using Alexandrian node-based design. Returns a prompt for LLM execution. Can generate all at once or one at a time using count=1 with focusOn for better parallelism.

Generate book prompts for a world pack. Returns prompts for GM book, player book, bestiary, and campaign setting.

Create the foundation for a new world from a campaign seed prompt. Returns a prompt for LLM execution.

List all active situation clocks with their current status.

Get full context for an AI player to make a decision

Get full details for a specific story arc from a world pack. Includes structure, situations, and resolution patterns.

Get full details for a specific archetype from a world pack.

List leads that are currently available for discovery. Filter by location, NPC, or prominence.

Get a character's full details

Get the current combat state

Get full details for a specific condition from a world pack.

Get the current turn state and active player

List all leads that players have discovered.

Get full details for a specific encounter from a world pack.

List encounters that fit the current context.

Get full details for a specific faction from a world pack.

Check world generation progress. Shows completed, in-progress, and pending phases with entity counts.

Get context-aware GM advice for common situations: stuck players, action resolution, pacing, tone, or NPC portrayal. Provides principles, suggestions, and relevant tool recommendations based on current session state.

Get the current state of an investigation including evidence, hypotheses, and progress.

Get full details for a specific item from a world pack.

Get full details for a specific location from a world pack.

Get full details for a specific monster from a world pack.

Get full details for a specific NPC from a world pack.

Quick check: How does this NPC feel about the party?

Get a player's full details

Get an NPC's current attitude and interaction history with the party.

Get full details for a specific situation from a world pack. Includes leads, clock, complications, and outcomes.

Get a character's current stress level, trauma status, and whether they can safely push.

Returns current game time for session

List clues that haven't been discovered yet. Filter by significance, location, or NPC.

Restore HP to a character. Capped at max HP. Use for any HP recovery (rest, spell, potion narration, GM fiat).

Convert situation leads into portable clues for flexible delivery.

Start tracking a relationship with an NPC.

List all characters in a session

List all items in a character's inventory. Shows equipped status, weight, and gold for itemized mode, or simple equipment list for narrative mode.

List all players in a session

List all tracked NPC relationships.

List all game sessions. Optionally filter by world pack ID.

List all saved world packs.

Load an existing game session by ID. Returns session state summary.

Load on-demand skill guidance into your context. Use when the current situation matches a skill's purpose (e.g. about to generate images, entering combat). The skill body is markdown — read it and apply it on this turn. Skill names come from the "Available skills" section of your system prompt. Available skills: - `combat-runner` — Tool-flow playbook for running combat encounters — when combat triggers, the start_combat → roll_initiative → attack → next_turn → end_combat sequence, position/effect calibration, autoTickClockIds, and the diegetic-narration rules for outcomes. Load when the player engages hostile contact, names tactical parameters (position/effect/target), or any combatant rolls into a multi-round encounter. - `companion-intelligence` — How to narrate and orchestrate AI-controlled party members — when to call get_ai_player_context, the four playstyle decision rules (tactical, roleplay, cautious, reckless), and the combat orchestration sequence (start_combat → roll_initiative → per-turn get_ai_player_context → submit_ai_player_action). Load when the active session has AI companions in the party. - `engine-flows` — Tool-flow playbooks for shop, rest, dialogue, and image generation — when each flow triggers, the exact tool sequence, the response-handling table, and the in-chat narration rules. Load when the player initiates buying/selling, requests a rest, an NPC enters a structured conversation, or you're about to render visuals. - `image-generation` — Visual layer guidelines — when to call frame_scene / generate_portrait / generate_item_art, how to write portrait & item descriptions for SDXL, the add_npc → generate_portrait → showDialogue contract for NPCs invented mid-session, and the silent-on-failure rule. Load when about to generate images, introduce an NPC, or reveal a notable item. - `player-interaction` — Structured-fork interaction tools — showDialogue / showShop / requestCombatAction / requestConfirmation. The scope of each (real player decisi…

Load a saved world pack by ID.

Load a compact GM reference for a world pack. Returns a token-efficient summary with entity IDs, names, and key stats. Use get_* tools (get_archetype, get_location, etc.) for full entity details.

Look up a rulebook entry by id (e.g. '5.6-trauma') for full mechanical detail, or list entries by tag (e.g. 'stress', 'combat') to find a specific entry. Use when you need engine math the system prompt doesn't cover (roll-under, custom tests, conditions catalog, trauma details, damage formula, world-overrides, etc.) — cheap (~1ms, no LLM call).

Merge newly generated content into an existing world pack.

Add or subtract gold from a character's inventory. Use positive amount to add, negative to subtract. Requires itemized inventory mode.