Identify and Fix Rust Engine Gaps vs Java
Identify and Fix Rust Engine Gaps vs Java
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Feb 15, 2:56 PM
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Compare our rust engine with the Java game engine. Identify gaps that would prevent us from correctly running our cards in the 4 sets we have, and update @mtg-rl/ROADMAP.md with the deficiencies.
The user wants me to compare the Rust mtg-rl engine with the Java XMage engine to identify gaps that would prevent correct card execution across the 4 sets (FDN, TLA, TDM, ECL). Then update ROADMAP.md with the findings.
This is a significant research task. Let me break it down:
Let me start by exploring the Rust engine's core files and the Java engine's key components in parallel.
I'll start by thoroughly exploring both engines in parallel to identify gaps.
Both agents are still exploring. Let me also look at what cards in our 4 sets use Custom effects (the main gap indicator) to understand the scope of unimplemented features.
All three research agents are still working. Let me also check what keyword abilities are defined vs mechanically enforced in the Rust engine, since that's a key area where gaps might exist.
All four agents are still working. I'll wait for them to complete before synthesizing findings.
Based on my analysis of the Rust mtg-rl engine at /mnt/dest-btrfs/home/jc/src/mage/mtg-rl/, here's the status of keyword ability enforcement and state-based actions:
47 keywords defined in /mnt/dest-btrfs/home/jc/src/mage/mtg-rl/mtg-engine/src/constants.rs (lines 533-584):
FLYING, FIRST_STRIKE, DOUBLE_STRIKE, TRAMPLE, HASTE, VIGILANCE, LIFELINK, DEATHTOUCH, REACH, DEFENDER, MENACE, FLASH, INDESTRUCTIBLE, HEXPROOF, SHROUD, FEAR, INTIMIDATE, PROTECTION, WARD, PROWESS, UNDYING, PERSIST, WITHER, INFECT, SHADOW, UNBLOCKABLE, CHANGELING, CASCADE, CONVOKE, DELVE, EVOLVE, EXALTED, EXPLOIT, FLANKING, FORESTWALK, ISLANDWALK, MOUNTAINWALK, PLAINSWALK, SWAMPWALK, TOTEM_ARMOR, TOXIC, AFFLICT, BATTLE_CRY, SKULK, FABRICATE, STORM, PARTNER
HASTE - Enforced
can_attack() (permanent.rs:250) to bypass summoning sicknessGainControlUntilEndOfTurn effect (game.rs:1727)FLYING - Enforced
can_block() check (combat.rs:205): flyers can only be blocked by flying or reach creaturesREACH - Enforced
can_block() check (combat.rs:205): reach creatures can block flyersDEFENDER - Enforced
can_attack() check (permanent.rs:249): creatures with defender cannot attackFIRST_STRIKE & DOUBLE_STRIKE - Enforced
has_first_strikers() determines if FirstStrikeDamage step is needed (combat.rs:166-186)TRAMPLE - Enforced
DEATHTOUCH - Enforced
MENACE - Enforced
satisfies_menace() function (combat.rs:216-224)INDESTRUCTIBLE - Enforced
VIGILANCE - NOT Enforced
LIFELINK - NOT Enforced
FLASH - Partially Enforced
The following keywords are defined but have zero mechanical enforcement:
state.rs:check_state_based_actions())Implemented state-based actions:
The game loop in game.rs only handles these steps:
Missing combat steps entirely:
This means although the combat module (combat.rs) has fully implemented functions for combat damage assignment, blocker restrictions, and first/double strike timing, they are never called by the game engine. Combat effectively does not happen.
| Keyword | Status | Enforcement |
|---|---|---|
| FLYING | Enforced | Blocks blocker legality check |
| REACH | Enforced | Blocks blocker legality check |
| DEFENDER | Enforced | Prevents attacking |
| HASTE | Enforced | Bypasses summoning sickness |
| FIRST_STRIKE | Enforced | Controls damage step timing |
| DOUBLE_STRIKE | Enforced | Allows damage both steps |
| TRAMPLE | Enforced | Excess damage to player |
| DEATHTOUCH | Enforced | Only 1 damage is lethal |
| MENACE | Enforced | Requires 2+ blockers |
| INDESTRUCTIBLE | Enforced | Survives lethal damage |
| VIGILANCE | Not Enforced | No tap prevention on attack |
| LIFELINK | Not Enforced | No damage→life connection |
| All Others (37+) | Decorative | Zero mechanical implementation |
/mnt/dest-btrfs/home/jc/src/mage/mtg-rl/mtg-engine/src/constants.rs - Keyword definitions (lines 533-622)/mnt/dest-btrfs/home/jc/src/mage/mtg-rl/mtg-engine/src/permanent.rs - Keyword checking methods (lines 127-192)/mnt/dest-btrfs/home/jc/src/mage/mtg-rl/mtg-engine/src/combat.rs - Combat damage and blocking logic (lines 199-224, 233-302)/mnt/dest-btrfs/home/jc/src/mage/mtg-rl/mtg-engine/src/state.rs - State-based action checks (lines 271-349)/mnt/dest-btrfs/home/jc/src/mage/mtg-rl/mtg-engine/src/game.rs - Game loop & turn-based actions (lines 363-447, 771-820)</result>Full transcript available at: /tmp/claude-1000/-mnt-dest-btrfs-home-jc-src-mage/tasks/aa5f9b3.output
Good, the keyword enforcement analysis is complete. Key finding: combat phase steps are not in the game loop even though combat.rs has the logic. That's a major gap. Waiting for the other three agents to finish.
I've completed a thorough exploration of the Rust mtg-rl engine at /mnt/dest-btrfs/home/jc/src/mage/mtg-rl/. Here's a detailed catalog of all implemented game mechanics and engine capabilities:
62 Effect Enum Variants - Status:
_ => {}):13 StaticEffect Enum Variants - Status:
12 Cost Enum Variants - All Declared:
~90 EventType Enum Variants Declared:
The AbilityStore tracks which triggered abilities respond to which EventTypes. Pre/post-event pairs (e.g., EntersTheBattlefield → EnteredTheBattlefield) allow replacement effects to intercept or modify events.
The main game runner implements the MTG turn sequence:
8 Zones Implemented:
Mana Struct:
Full Combat Implementation:
TargetSpec Enum (from abilities.rs):
TargetDefinition (from targets.rs):
SelectedTargets:
Game Loop Targeting:
KeywordAbilities Bitflags (u64):
ContinuousEffect Struct:
Layer System (9 layers matching MTG rules 613):
EffectModification Enum:
ReplacementEffect Struct:
ReplacementKind Enum:
PlayerDecisionMaker Trait Methods Defined:
PlayerAction Enum:
Implementations:
CounterType Enum (68 variants):
Counters Container:
Permanent Fields:
CardData Struct:
Permanent Struct (wraps CardData):
Methods:
AbilityStore:
Ability Types (from AbilityType enum):
Ability Activation:
Stack Resolution:
| File | Lines | Purpose |
|---|---|---|
| game.rs | ~1200 | Main game loop, turn structure, priority system, effect resolution |
| abilities.rs | ~1623 | Effect/Cost/StaticEffect/Ability definitions + builders |
| effects.rs | ~542 | Continuous effects, 7-layer system, replacement effects |
| events.rs | ~753 | Event types, GameEvent struct, event builder methods |
| decision.rs | ~400+ | PlayerDecisionMaker trait, PlayerAction enum, GameView |
| state.rs | ~800+ | GameState struct, battlefield, zones, player storage |
| combat.rs | ~250+ | CombatState, CombatGroup, validation logic |
| permanent.rs | ~400+ | Permanent struct, keyword checks, P/T calculation |
| card.rs | ~200+ | CardData struct, card type checks |
| mana.rs | ~300+ | Mana struct, cost parsing, payment validation |
| constants.rs | ~910 | Zone, PhaseStep, CardType, Color, SubType, KeywordAbilities, Layer/SubLayer |
| zones.rs | ~300+ | Library, Hand, Graveyard, Exile, Battlefield, Stack containers |
| counters.rs | ~250+ | CounterType enum, Counters container |
This completes the comprehensive catalog of the mtg-rl engine. The implementation is functionally complete for basic gameplay (casting spells, activating abilities, combat, life gain/loss, drawing cards), but lacks advanced features like triggered ability stacking, replacement effect interception, and proper continuous effect layer recalculation.</result>
<usage>total_tokens: 114137
tool_uses: 25
duration_ms: 114113</usage>
</task-notification>
Full transcript available at: /tmp/claude-1000/-mnt-dest-btrfs-home-jc-src-mage/tasks/ac21389.output
Good, the Rust engine inventory is complete. Two agents done, two still running. Let me check on the remaining two.
The Java engine agent is still working and the Custom effects agent is wrapping up. I can see from partial output that there are 940 total Custom usages across all sets (747 Effect::Custom, 160 StaticEffect::Custom, 33 Cost::Custom). Let me wait for both to finish.
Across the 4 Rust card sets (FDN, TLA, TDM, ECL), there are 940 total Custom fallback usages distributed as follows:
By Type:
By Set:
| Category | Count | Key Patterns |
|---|---|---|
| Generic/Placeholder | 355 | "ETB effect", "Activated effect", "Spell effect", etc. — mostly stub implementations |
| ETB/Enter Effects | 122 | "ETB effect" (79), Saga mechanics (6), conditional ETB abilities (37) |
| Activated Abilities | 67 | Generic "Activated effect" — all 67 cards need proper activation logic |
| Cast/Spell Triggers | 47 | Cost reduction (6), flashback/graveyard casting (6), trigger modifiers (35) |
| Attack/Combat Triggers | 45 | Combat damage triggers (21), combat phase effects (24) |
| Attach/Enchant Effects | 28 | Auras and equipment attachment mechanics |
| Exile/Play From | 25 | Exile mechanics, cascade-like effects, suspend, "play cards exiled" |
| Spell Effects | 21 | Generic spell mechanics placeholder |
| Dies/Sacrifice | 18 | Death triggers, sacrifice effects (11) |
| Tapped/Untap | 10 | Tapped mechanics, land tutoring with tapped keyword |
| Earthbend/Keywords | 5 | TLA-specific custom keywords (Earthbend 1-2) |
| Cost Modifiers | 4 | Cost reduction based on game state |
Modal/Choice Mechanics:
Complex Conditional Effects:
X-Cost Effects:
Copy/Token Mechanics:
Graveyard/Exile Mechanics:
Saga Mechanics:
Combat/Evasion:
| Category | Count | Key Patterns |
|---|---|---|
| Generic/Placeholder | 94 | "Static effect" (90), "Conditional continuous effect" (4) |
| Other | 14 | Misc mechanics (affinity, deck restrictions, etc.) |
| P/T Modification | 11 | Conditional boosts, lord effects |
| Counter/Spell Protection | 8 | Can't be countered, counter manipulation |
| Evasion/Block Restrictions | 5 | Daunt, block restrictions, shadow-like effects |
| Protection Effects | 4 | Hexproof, protection from colors |
| Keyword Grant | 4 | Flash conditional, haste conditional |
| Damage/Prevention | 4 | Damage assignment, damage prevention |
| Keyword Abilities | 4 | Kicker, Convoke, Delve as static effects |
| Transform/Copy | 3 | Transform mechanics, copy effects |
| Mana/Land Effects | 3 | Additional land drops, mana doubling |
| Cost Reduction | 2 | Cost reduction based on conditions |
| Enter/ETB Effects | 1 | Enters tapped mechanics |
| Ward/Tax Effects | 1 | Ward keyword |
| Token Creation | 1 | Token doubling |
| Trigger Modifiers | 1 | Trigger multipliers |
High-Impact Missing Features (1 card each, but critical):
Protection & Evasion (5 cards):
P/T Modification (11 cards):
All Cost::Custom usages represent activated abilities or costs that don't fit the engine's Cost enum. Breakdown:
| Category | Count | Examples |
|---|---|---|
| Mana/Tap Costs | 13 | Complex mana abilities: "{T}: Add {C}{C}", "{2}{G}{G}: Put X counters" |
| Sacrifice Costs | 9 | "{X}, Sacrifice: [effect]" patterns (search library, destroy, draw, etc.) |
| Tap Creature Costs | 5 | "Tap 3 untapped creatures you control", "Tap another untapped creature" |
| Exile Costs | 3 | "Exile this card from graveyard", "Exile this enchantment" |
| Complex Multi-Part | 2 | "{8}: Create 4/4 Dragon token", "{T}: Create X 1/1 tokens where X = [condition]" |
| Discard Costs | 1 | "Discard your hand" |
Multi-Step Search Abilities:
Complex Tap Abilities:
Land Abilities:
Draw/Sacrifice Combos:
Based on the Custom patterns analysis, here are the highest-priority missing engine features by impact:
Proper ETB Effect Framework (122 customs)
Effect::EntersBattlefield { effect: Box<Effect> }Modal Spells / Choice Mechanics (20+ customs)
Activated Ability Framework (67+ customs)
Combat Trigger Framework (45 customs)
Conditional/State-Based Effects (30+ customs)
Graveyard Casting & Exile Management (25 customs)
Spell/Cast Triggers (47 customs)
Copy & Token Creation (20+ customs)
Saga Mechanics (6 customs)
Die/Sacrifice Triggers (18 customs)
Aura/Equipment Attachment (28 customs)
Keyword Ability Grants (15+ customs)
Delve/Convoke/Affinity (4 customs)
Ward/Tax Effects (2 customs)
Transform Mechanics (3 customs)
Trigger Multipliers (1 custom)
X-Cost Effects (Several)
Mana Doubling / Land Effects (3 customs)
FDN (Foundations) - 401 customs:
TLA (Avatar: The Last Airbender) - 253 customs:
TDM (Tolkien) - 130 customs:
ECL (Eclogue) - 156 customs:
From the analysis, the most common TargetSpec patterns in Custom effects are:
Most decision makers appear to be:
This analysis demonstrates that the engine currently lacks ~940 implemented features across spell/ability/cost mechanics, with the largest opportunity being the elimination of ~220 generic placeholder stubs via proper framework implementations.</result>
<usage>total_tokens: 62447
tool_uses: 18
duration_ms: 98767</usage>
</task-notification>
Full transcript available at: /tmp/claude-1000/-mnt-dest-btrfs-home-jc-src-mage/tasks/a715424.output
Good, three agents done. Let me wait for the Java engine exploration to complete.
All four agents are complete. Now I have comprehensive data from all four research agents:
Now I need to synthesize this into a comprehensive, updated ROADMAP.md. Let me read the current ROADMAP.md first (already shown in the system prompt), then write the updated version.
Looking at the research data, I'm seeing some critical architectural issues: the combat phase code exists but isn't actually being called from the main game loop, triggered abilities aren't being placed on the stack properly, replacement effects have data structures but no event interception mechanism, the continuous effect layer system isn't being recalculated, and priority passing during combat is incomplete. Beyond the core game loop, there are also gaps in keyword enforcement where only 10 keywords are properly enforced while 37 are just decorative. Flying, Reach, Defender, Haste, First Strike, Double Strike, Trample, Deathtouch, Menace, Indestructible, and over 37 others like Vigilance and Lifelink aren't being enforced yet. I've got about 55 of the 62 effect variants implemented, but I'm still missing GainProtection, PreventCombatDamage, and a Custom fallback that's covering 940 cases across the sets. Looking at the bigger picture, there are some major engine gaps—I don't have equipment attachment, planeswalker loyalty abilities, X-cost handling, or the watcher system that Java uses extensively. The replacement effect pipeline and continuous effect layers aren't enforced either, and I'm missing things like impulse draw, flashback casting, sagas, and delayed triggers. Across the sets, there are hundreds of custom effects I'm falling back on, with FDN alone accounting for over 400.
Now I'm organizing all this into a comprehensive roadmap that covers the critical engine gaps, missing systems, keyword enforcement, and effect system issues, then breaking down the per-set status and creating a prioritized implementation plan. Generating the roadmap document...
All four research agents are complete. Now I have comprehensive data to synthesize. Let me read the current ROADMAP.md one more time before rewriting it.
Now I have all the data. Let me synthesize everything into a comprehensive updated ROADMAP.md. I'll organize it clearly with the gaps identified from comparing the Rust and Java engines.
Key findings from all four agents:
CRITICAL: Combat phase not in game loop
game.rs only processes: Untap, Draw, Cleanup
Missing: Upkeep, PrecombatMain, BeginCombat, DeclareAttackers, DeclareBlockers, FirstStrikeDamage, CombatDamage, EndCombat, PostcombatMain, EndStep
combat.rs has fully implemented functions for damage assignment, blocker restrictions, first/double strike
BUT they're never called
I'm seeing conflicting reports here. The keyword agent said combat isn't in the game loop, but the Rust engine agent listed the full PhaseStep enum with all phases. Let me verify what process_step actually handles by checking the code more carefully.
Looking at the actual implementation, the keyword agent was right—game.rs only processes Untap, Draw, and Cleanup phases, completely skipping the combat sequence and main phases that the Rust engine agent described in the enum definition. I'm seeing a discrepancy between what the phase enum defines and what the game loop actually implements—the keyword agent flagged that combat steps are missing from the loop, but the Rust engine agent shows combat is partially implemented with simplifications. Let me verify this by checking the turn sequence in game.rs to understand what's actually being processed versus what's defined.
Let me verify one critical claim from the keyword agent - whether combat is actually missing from the game loop.
The keyword agent was right - the game loop only handles PhaseStep::Untap, PhaseStep::Draw, and PhaseStep::Cleanup. No combat phases, no main phases, no upkeep, no end step. Let me also check the turn sequence to see what phases the game iterates through.
OK so the turn_based_actions function only has specific code for Untap, Draw, and Cleanup. Everything else falls through to _ => {} which just does nothing. But the game does advance through ALL steps since advance_step() is called. Let me check what steps are in the turn sequence. Let me check the TurnManager and what steps it advances through.
OK so the game DOES advance through all 13 steps (including all combat steps). And the priority loop runs for all steps except Untap and Cleanup. The issue is that turn_based_actions() only has specific code for Untap, Draw, and Cleanup - the combat steps fall through to _ => {} which means no combat damage is dealt, no attackers/blockers are declared by the game engine, etc.
But crucially, the priority loop DOES run during PrecombatMain, all combat steps, PostcombatMain, and EndStep. So players CAN take actions (cast spells, play lands, activate abilities) during those steps. They just can't declare attackers/blockers because the combat system isn't wired in.
I've got the data I need now. The core issue is that while the game traverses all 13 steps and the priority loop functions during most of them, the combat-related steps lack implementation - there's no logic to handle attacker/blocker declarations, damage assignment, or keyword abilities like lifelink and vigilance. I should update the roadmap to reflect this. ap and Cleanup
Missing from turn_based_actions:
Triggered Abilities:
Static Effects:
There are 940 custom fallback effects across the codebase, which suggests the engine is missing major features that Java's Magic engine has: replacement effects with full interception, continuous effect layer recalculation, a robust watcher system, equipment and aura attachment, planeswalker mechanics, X-cost spells, copy effects, requirement/restriction effects, AsThoughEffect for graveyard play and flashback, cost modification, prevention effects, and multiple effect types that are only partially implemented.
Now I'm going to write out a comprehensive roadmap document that organizes all these missing features.
Good - the game does advance through all 13 steps, and the priority loop runs for all but Untap/Cleanup. But turn_based_actions() only has code for Untap, Draw, and Cleanup - combat damage is never dealt, attackers/blockers are never declared. Now I have the full picture. Let me write the updated ROADMAP.md.
The ROADMAP.md has been rewritten. Here's a summary of the key findings from comparing the two engines:
Critical gaps (affect ALL cards):
combat.rs has full damage/blocking logic but turn_based_actions() only handles Untap/Draw/Cleanup. Every creature is affected (~800+ cards).Keyword enforcement: 10 of 47 keywords have mechanical code in combat.rs, but since combat doesn't run, only Haste and Defender are active in practice. Lifelink, Vigilance, Hexproof, Protection, and 35 others are purely decorative.
940 Custom fallbacks across the 4 sets (FDN: 401, TLA: 253, ECL: 156, TDM: 130) — the largest categories being generic ETB/activated/spell stubs that need triggered ability stacking to work.
Java-exclusive systems the Rust engine completely lacks: 84+ watcher classes, equipment/aura attachment, planeswalker loyalty abilities, X-cost spells, spell copying, delayed triggers, alternative/additional costs, AsThoughEffect, combat damage assignment order, hybrid mana, and last-known-information tracking.
Based on my thorough exploration of the Java XMage engine, here's a comprehensive catalog of the key capabilities you need to understand for identifying gaps in the Rust reimplementation:
GameImpl.play() → outer loop over turns, calls playTurn() for each playerTurn.play() executes phases in sequence (Untap, Upkeep, Draw, Pre-Combat Main, Combat, Post-Combat Main, End)GameImpl.playPriority() handles stack resolution and player interactions
playExtraTurns() manages turn mods/extra turns before normal turn progressionThree main effect categories:
OneShotEffect - One-time effects that resolve immediately
apply() method executes effect onceContinuousEffect - Ongoing effects that apply in layers (616.1-7)
ReplacementEffect - Intercepts events before they happen
replaceEvent() modifies or prevents eventsapplies() checks if this replacement should applyAdditional effect types:
The effect manager ContinuousEffects maintains:
layeredEffects - applied in 7 layers per Layer enumreplacementEffects - checked first on eventspreventionEffects - damage preventionrequirementEffects - attack/block requirementsrestrictionEffects - can't attack/block/cast restrictionsLayer execution order (608.2):
ContinuousEffect interface requires:
apply(Layer, SubLayer, Ability source, Game game) - apply effect in specific layerhasLayer(Layer) - declare which layers this effect usesisInactive(source, game) - check if effect should stop applyingCombat state management (Combat class):
CombatGroup objects (attacker + blockers + defenders)defenders set (players, planeswalkers, battles that can be attacked)attackingPlayerId - who declared attackersattacking flagblocking count and minBlockedBy/maxBlockedBy constraintsCombat mechanics:
useToughnessForDamage flag - some effects let creatures use toughness for damage insteadProtectedByOpponentPredicateFlyingEffect (RestrictionEffect)bandedCards listRequirementEffect) for "must attack/block" mechanicsKey events:
Stack implementation (SpellStack extends ArrayDeque):
resolve() method executed when all players passcounter() method removes from stack (with replacement effects)Spell execution:
Priority passing:
Target interface (Target class hierarchy):
canChoose() - can player choose from legal targets?possibleTargets() - returns list of valid target objectsisChosen(), isChoiceCompleted())TargetPermanent - battlefield permanentsTargetCard - cards in any zoneTargetPlayer - player selectionTargetSpell - stack spells onlyTarget validation on cast:
Checked via checkStateBasedActions() - called frequently:
Attachment system (attachedTo field on Permanent):
EquipAbility - sorcery-speed, costs mana, attaches to creature you controlAuraReplacementEffect)Loyalty mechanics (LoyaltyAbility class):
PayLoyaltyCost - static costs (+X, -Y counters)PayVariableLoyaltyCost - variable loyalty costsCounterType.LOYALTY)PreventionEffect and modificationCore replacement flow:
getReplacementEffects() list is checkedchecksEventType() filters for relevant eventsapplies() checks source-specific conditionsreplaceEvent() modifies or cancels eventScope rules (614.12):
scopeRelevant flag triggers scope checksVariable mana cost (VariableManaCost class):
{X} announced before paying manaxValue - final X amount after replacement effectsxPay - total mana to pay (includes multiples like {X}{X})minX/maxX bounds ("X can't be greater than...")In abilities:
Mode selection (Modes/Mode classes):
Modes.getSelectedModes() returns chosen modesMode contains effects for that mode onlySpell copying:
CopyEffect - ReplacementEffect on CAST_SPELL or ability triggercreateCopyOnStack() - creates new Spell with same abilities, can choose new targetsPermanent copying:
CopyApplier)Trigger detection:
fireEvent() / raiseEvent() in gameWatcher system (84+ watchers in common):
Watcher extends Listenerwatch(GameEvent, Game) called on each eventExample watchers:
AttackedThisTurnWatcher - tracks Set<MageObjectReference> of creatures attackedAbilityResolvedWatcher - tracks which abilities resolvedCardsDrawnThisTurnWatcher - counts cards drawn per playerBlockedAttackerWatcher - tracks which creatures got blockedMechanically enforced keywords (246+ keyword ability classes):
Evasion/Combat Keywords:
EvasionAbility with RestrictionEffect to prevent blockingDamage/Combat Keywords:
Special Keywords:
bandedCards listgoadingPlayers set on permanent, forces attacksphasedIn flag on permanentCost/Ability Keywords:
Other:
RegenerateSourceEffect replaces destructioncontrolledFromStartOfControllerTurn flagtransformed flag + attributesEvent system with 600+ EventType values:
Core game events:
Turn-based events:
Permanent events:
Card movement events:
Combat events:
Ability events:
Damage/life events:
Based on this comprehensive survey, verify your Rust engine covers:
File paths for deeper reference:
/mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/game/GameImpl.java/mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/abilities/effects//mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/game/combat/Combat.java/mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/game/stack//mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/game/permanent/PermanentImpl.java/mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/game/events/GameEvent.java/mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/watchers/ (84+ common watchers)/mnt/dest-btrfs/home/jc/src/mage/Mage/src/main/java/mage/abilities/keyword/ (246+ keywords)</result>Full transcript available at: /tmp/claude-1000/-mnt-dest-btrfs-home-jc-src-mage/tasks/a2b068c.output
The Java engine agent completed (its findings were already incorporated). The ROADMAP.md update is done. Here's a quick recap of the document structure:
Nine sections covering:
| Section | Content |
|---|---|
| I. Critical Game Loop Gaps | Combat not wired in, triggers not stacked, layers not applied, replacements not integrated |
| II. Keyword Enforcement | 47 keywords: 10 have code (8 dormant since combat doesn't run), 37 decorative |
| III. State-Based Actions | 7 of ~13 key rules implemented; missing library-empty loss, aura fall-off, saga sacrifice |
| IV. Missing Engine Systems | 20 items in 4 tiers ranked by cards-unblocked |
| V. Effect System Gaps | 55/62 variants implemented; 940 Custom fallbacks categorized |
| VI. Per-Set Counts | FDN: 401, TLA: 253, ECL: 156, TDM: 130 customs |
| VII. Java Comparison | 20+ Java-exclusive features the Rust engine lacks |
| VIII. Phased Plan | 5 phases from "make combat work" through "eliminate all customs" |
| IX. Completed Work | Batches 1-10 recap |
The biggest takeaway: combat integration and triggered ability stacking are the two highest-leverage items — together they'd make ~1,200+ cards substantially more functional.
ralph-loop:ralph-loop
Args: "Read mtg-rs/ROADMAP.md, and identify work that is outstanding to bring our rust engine into parity with Java. Do not implement any new sets, but add engine features that area missing. Our goal is to complete the fully functional implementation of ECL by implementing engine capabilities and updating cards to use them. Work one task at a time until we are done. Read the corresponding java source to understand how to shape the implementation. Update the ROADMAP and leave a note as you progress. Add tests for each engine feature you add. Commit changes after each item. Then get another ROADMAP item until the engine is at parity with the Java engine." --completion-promise "DONE" --max-iterations 90
Execute the setup script to initialize the Ralph loop:
🔄 Ralph loop activated in this session!
Iteration: 1
Max iterations: 90
Completion promise: DONE (ONLY output when TRUE - do not lie!)
The stop hook is now active. When you try to exit, the SAME PROMPT will be
fed back to you. You'll see your previous work in files, creating a
self-referential loop where you iteratively improve on the same task.
To monitor: head -10 .claude/ralph-loop.local.md
⚠️ WARNING: This loop cannot be stopped manually! It will run infinitely
unless you set --max-iterations or --completion-promise.
🔄
Read mtg-rs/ROADMAP.md, and identify work that is outstanding to bring our rust engine into parity with Java. Do not implement any new sets, but add engine features that area missing. Our goal is to complete the fully functional implementation of ECL by implementing engine capabilities and updating cards to use them. Work one task at a time until we are done. Read the corresponding java source to understand how to shape the implementation. Update the ROADMAP and leave a note as you progress. Add tests for each engine feature you add. Commit changes after each item. Then get another ROADMAP item until the engine is at parity with the Java engine.
═══════════════════════════════════════════════════════════
CRITICAL - Ralph Loop Completion Promise
═══════════════════════════════════════════════════════════
To complete this loop, output this EXACT text:
<promise>DONE</promise>
STRICT REQUIREMENTS (DO NOT VIOLATE):
✓ Use <promise> XML tags EXACTLY as shown above
✓ The statement MUST be completely and unequivocally TRUE
✓ Do NOT output false statements to exit the loop
✓ Do NOT lie even if you think you should exit
IMPORTANT - Do not circumvent the loop:
Even if you believe you're stuck, the task is impossible,
or you've been running too long - you MUST NOT output a
false promise statement. The loop is designed to continue
until the promise is GENUINELY TRUE. Trust the process.
If the loop should stop, the promise statement will become
true naturally. Do not force it by lying.
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Please work on the task. When you try to exit, the Ralph loop will feed the SAME PROMPT back to you for the next iteration. You'll see your previous work in files and git history, allowing you to iterate and improve.
CRITICAL RULE: If a completion promise is set, you may ONLY output it when the statement is completely and unequivocally TRUE. Do not output false promises to escape the loop, even if you think you're stuck or should exit for other reasons. The loop is designed to continue until genuine completion.
I'll start by reading the ROADMAP.md to understand the current state and identify the first task to work on.
The ROADMAP is clear. The #1 priority is Combat Integration (Phase 1, item 1). This is the single highest-impact change - it affects every creature card (~800+). Let me start with this.
I need to:
Read the current game.rs to understand the turn_based_actions function
Read combat.rs to understand what's already implemented
Read the PlayerDecisionMaker trait to understand what decisions exist
Read the Java combat implementation for reference
Implement the combat phase in turn_based_actions
Add choose_attackers/choose_blockers to PlayerDecisionMaker
Wire up lifelink and vigilance to the combat system
Write tests to verify the integration works
Update the ROADMAP to reflect completion
Commit the changes
Let me start by reading the key Rust files.
The #1 priority is Combat Integration — wiring combat.rs into the game loop. This is the single highest-impact change. Let me start by reading the key engine files.
The decision.rs already has select_attackers() and select_blockers() methods in the trait! That's great — the decision maker interface is ready. Now I need to read game.rs in sections to understand the current game loop and where to add combat.
The PlayerDecisionMaker trait already has select_attackers() and select_blockers()! That's great. Let me read the relevant parts of game.rs - the turn_based_actions and related areas.
Now I need to see how damage is dealt to creatures and players, and where CombatState lives. Let me check the GameState struct and find the deal_damage and similar functions.
Now let me check the GameState struct for combat_state and the damage-dealing functions.
I see that the GameState doesn't have a combat_state field. I need to add CombatState to GameState and wire the combat logic into turn_based_actions(). Let me also check how damage is applied in the execute_effects for DealDamage, since I'll need to do the same for combat damage.
Let me check how DealDamage is executed in game.rs, and also how the AI implementations handle select_attackers/select_blockers.
Now let me check the AI implementations for select_attackers/select_blockers.
Let me check the heuristic and random player implementations more efficiently.
I have a good understanding of the codebase. The AI implementations already handle select_attackers/select_blockers. The combat.rs module has all the logic. The GameState just needs a combat_state field, and game.rs needs the turn_based_actions to be wired up for combat steps.
Let me also check the AlwaysPassPlayer to see if it needs updating, and find the existing test infrastructure.
Let me also check how AlwaysPassPlayer handles these methods, and the Permanent methods for tapping/attacking.
Now let me find the AlwaysPassPlayer in game.rs and understand how the test player works.
I now have a thorough understanding of the codebase. Let me also check the opponent_of() method to understand how to get the defending player.