fix(engine): gate Max speed activated abilities on the controller's speed - #7519
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CR 702.178a: "Max speed — [Ability]" means "As long as your speed is 4,
this object has '[Ability]'." The ability is ABSENT below max speed, so
the prefix is an activation restriction (CR 602.5), not an intervening-if
condition (CR 608.2c). The parser recognized the prefix and dropped it:
Howlsquad Heavy reached the battlefield with condition=None and no
restrictions, so its mana ability produced {R} at speed 0.
Adds ParsedCondition::HasMaxSpeed (a player-designation leaf beside
HasCityBlessing), moves StaticCondition::HasMaxSpeed out of the
oracle_condition bridge's rejection group, and evaluates it through
game::speed::has_max_speed — the same authority layers.rs uses, so
CR 702.179d cannot diverge between the static and restriction readings.
The oracle.rs seam's `matches!(.., SourceIsHarnessed)` stamp becomes
keyword_prefix_activation_restriction, which keeps CR 207.2c ability
words ungated: their condition is printed in the ability's own text, so a
label-derived gate would apply it twice and, where the label gates only
the effect, refuse a legal activation.
Covers 17 paper cards; three of the labeled abilities are mana abilities,
which bypass the stack (CR 605.3a).
Closes phase-rs#7517.
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Included review availability: Your plan includes up to 2 reviews per rolling hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe parser now preserves ChangesMax Speed activation gating
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The PR gates Max speed activated abilities, but the current implementation may still allow activation based on the wrong player's speed, causing abilities to be available when their source permanent's controller is not at max speed. Merge should wait for this bounded correctness issue to be fixed or explicitly accepted; the test's rules citation also needs correction. Sequence Diagram(s)sequenceDiagram
participant OracleParser
participant ActivatedAbility
participant RestrictionEvaluator
participant SpeedAuthority
OracleParser->>ActivatedAbility: attach HasMaxSpeed restriction
ActivatedAbility->>RestrictionEvaluator: check activation
RestrictionEvaluator->>SpeedAuthority: resolve controller or owner speed
SpeedAuthority-->>RestrictionEvaluator: return max-speed result
RestrictionEvaluator-->>ActivatedAbility: allow or reject activation
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In `@crates/engine/src/parser/oracle.rs`:
- Around line 2942-2947: Update the StaticCondition::HasMaxSpeed handling so
ParsedCondition::HasMaxSpeed evaluates the source permanent’s battlefield
controller, falling back to its owner when it is off the battlefield, rather
than the activating player. Preserve the CR 702.178a behavior and add an
integration case covering a non-controller activator with different speeds from
the source controller.
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crates/engine/src/ai_support/filter.rscrates/engine/src/game/restrictions.rscrates/engine/src/parser/oracle.rscrates/engine/src/parser/oracle_condition.rscrates/engine/src/parser/oracle_tests.rscrates/engine/src/types/ability.rscrates/engine/tests/integration/howlsquad_max_speed_reads_controller.rscrates/engine/tests/integration/main.rs
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| // `RequiresCondition` is evaluated against the ACTIVATING player, who is | ||
| // the source's controller (CR 602.2), so the owner's speed is never read | ||
| // for a permanent on the battlefield. | ||
| StaticCondition::HasMaxSpeed => Some(ActivationRestriction::RequiresCondition { | ||
| condition: Some(ParsedCondition::HasMaxSpeed), | ||
| }), |
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🎯 Functional Correctness | 🟠 Major | 🏗️ Heavy lift
Use the source controller for a Max speed keyword gate.
ActivationRestriction::RequiresCondition evaluates ParsedCondition::HasMaxSpeed with the activating player. That is wrong when another player may activate the ability. If the source controller has speed 2 and an allowed non-controller activator has speed 4, this code permits an ability that CR 702.178a makes absent.
Represent the Max speed subject explicitly as the source permanent’s controller on the battlefield, with the owner fallback off the battlefield. Add an integration case where a non-controller may activate the ability and the two players have different speeds.
This conflicts with the stated requirement to evaluate the ability controller’s speed.
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In `@crates/engine/src/parser/oracle.rs` around lines 2942 - 2947, Update the
StaticCondition::HasMaxSpeed handling so ParsedCondition::HasMaxSpeed evaluates
the source permanent’s battlefield controller, falling back to its owner when it
is off the battlefield, rather than the activating player. Preserve the CR
702.178a behavior and add an integration case covering a non-controller
activator with different speeds from the source controller.
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Manual implementation review is clean for |
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Generated for head Parse changes introduced by this PR · 18 card(s), 8 signature(s) (baseline: main
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Request changes — Max-speed restriction reads the activator, not the source's controller
Blocker. keyword_prefix_activation_restriction lowers Max speed to ActivationRestriction::RequiresCondition { HasMaxSpeed } (crates/engine/src/parser/oracle.rs:2942-2947). That generic restriction evaluates its condition with the activating player (crates/engine/src/game/restrictions.rs:1100-1102), and HasMaxSpeed reads that player's speed (:1648). This is not always the permanent's controller: AbilityDefinition::activator_filter explicitly permits All or Opponent (crates/engine/src/types/ability.rs:20309-20312), and the activation path enforces that permission independently of obj.controller (crates/engine/src/game/casting.rs:18448-18459, :18920-18933).
CR 702.178a says that max speed grants the ability only while the permanent's controller has speed 4 (owner if the card is not on the battlefield); CR 702.179e defines max speed. Please model this as a source-controller/owner-scoped activation gate rather than reusing the activator-scoped generic condition, and add a production-path regression with an allowed non-controller activator whose speed differs from the source controller's in both directions.
Evidence gap. The current SHA-bound parse artifact reports no card-parse changes: #7519 (comment). The PR body claims this enables the Max-speed activated-ability class (17 paper cards). Reconcile that mismatch by making the coverage/parse projection represent this changed activation restriction, or document and prove why its omission is intentional; current evidence cannot verify the claimed card-class impact.
Current CodeRabbit independently reports the controller/activator issue at this exact head: #7519 (review)
Review catch on this PR. `ParsedCondition::HasMaxSpeed` was evaluated against whoever was activating. CR 702.178a's "your" is addressed to the object, and the "Max Speed" glossary entry (sense 2) names exactly whose speed it is: "that permanent's controller (or that card's owner, if it isn't on the battlefield)". Those two players are not always the same. CR 602.1a admits an `activator_filter` of `PlayerFilter::All`, and 42 cards print "Any player may activate this ability" (measured against client/public/card-data.json). The off-battlefield branch is live too: CR 702.178b keeps a max speed ability functioning in the zone its granted ability names, and five Aetherdrift Surveyors activate theirs from a graveyard. `HasCityBlessing` keeps reading the activating player and is not touched — its cards print "only if YOU have the city's blessing", addressed to the activator. That difference is now stated at the leaf. Two doc comments claimed the activator IS the controller. They were wrong; both are corrected rather than reworded. NOT reachable today: no printed card combines a max speed ability with "any player may activate this ability", so the defect could not fire in the current pool. The two new rows stamp the permission on directly, which is the honest way to cover the class rather than the card.
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Accepted — the leaf read the wrong player. Fixed in 4888e89. CR 702.178a's "your" is addressed to the object, and the "Max Speed" glossary entry (sense 2) names whose speed exactly: "that permanent's controller (or that card's owner, if it isn't on the battlefield)". Reachability, measured against
So the defect could not fire in the current pool. The leaf was still wrong, and the off-battlefield branch is live regardless of the activator question. Two new rows in Counter-probe: restoring
Also corrected: two doc comments asserted the activator IS the controller. They were plainly wrong, not merely imprecise. 19415 + 5218 tests pass; |
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Inline comments:
In `@crates/engine/src/types/ability.rs`:
- Around line 9387-9397: Update the comments documenting HasMaxSpeed to cite
unlettered CR 602.2 wherever they currently reference CR 602.1a, preserving the
existing explanation of the controller/owner rule and exception.
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crates/engine/src/game/restrictions.rscrates/engine/src/parser/oracle.rscrates/engine/src/types/ability.rscrates/engine/tests/integration/howlsquad_max_speed_reads_controller.rscrates/engine/tests/integration/main.rs
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- crates/engine/src/game/restrictions.rs
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Request changes — correct the current CR evidence and cover the reachable owner branch.
🔴 Blocker
-
The new comments at
crates/engine/src/parser/oracle.rs:2943,crates/engine/src/game/restrictions.rs:1649, andcrates/engine/src/types/ability.rs:9391cite CR 602.1a for the exception that lets someone other than the controller activate an ability. That citation is incorrect: CR 602.1a says that the activation cost is everything before the colon, while CR 602.2 says, “Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise.” Please replace these citations with CR 602.2.The new comments at
restrictions.rs:1662,ability.rs:9395, andcrates/engine/src/ai_support/filter.rs:1085also describe CR 702.179d as a cap-lifting exception. CR 702.179d instead defines the inherent once-per-turn speed trigger; CR 702.179e defines max speed as speed 4. Please remove or correct the 702.179d cap-lifting claim (and retain only citations that actually describe the annotated behavior). -
ParsedCondition::HasMaxSpeednow deliberately branches between the battlefield controller and off-battlefield owner atcrates/engine/src/game/restrictions.rs:1664-1670, but every added integration fixture places Howlsquad on the battlefield (howlsquad_max_speed_reads_controller.rs:76-95). The PR itself identifies a live graveyard class, and CR 702.178b says a max-speed ability functions from a named zone when its granted ability does. Add a productionGameAction::ActivateAbilityregression using a real max-speed ability that functions from the graveyard: prove the owner at max speed succeeds and the owner below max speed is rejected. That makes the new owner arm discriminating rather than inferred from the battlefield controller tests.
✅ Clean
The former controller/activator defect is resolved on this head: restrictions.rs:1664-1670 now scopes Max speed to the source’s controller on the battlefield and owner elsewhere, and the two PlayerFilter::All cases at howlsquad_max_speed_reads_controller.rs:197-220 distinguish an allowed non-controller activator’s speed from the source controller’s speed.
Recommendation: request changes for the citation corrections and the owner-scope production regression, then re-review the new head.
Review findings on phase-rs#7519, all three accepted. CR 602.1a is the activation-cost rule ("everything before the colon"). The rule that lets someone other than the controller activate an ability is CR 602.2 ("unless the object specifically says otherwise"). Corrected at `parser/oracle.rs`, `game/restrictions.rs`, `types/ability.rs`; the tree's other CR 602.1a citations really are about the cost and are untouched. CR 702.179d is the inherent once-per-turn speed trigger, not a cap-lifting exception. What `game::speed::can_increase_speed_beyond_4` implements is a card overriding a rule (Gomif) — CR 101.1. Corrected at `restrictions.rs`, `types/ability.rs`, `ai_support/filter.rs`. New `max_speed_owner_arm_from_graveyard.rs` drives `GameAction::ActivateAbility` on Loxodon Surveyor from P0's graveyard: owner at speed 4 with the opponent at 0 pays the cost, owner at 3 with the opponent at 4 is refused. Counter-probe: removing the `HasMaxSpeed` arm from `keyword_prefix_activation_restriction` drops the second row. `ability_details` (`game/coverage.rs`) never projected `activation_restrictions`, so this PR's gate was invisible to the parse-diff artifact by construction. It now emits `gate: max speed`, scoped to the one shape `keyword_prefix_activation_restriction` produces — the same discipline and COUPLING note the `repeat_for` projection above it carries. Does not cover: the new rows separate the owner from the OTHER player, not from `object.controller`. A third row pins why — CR 108.4a's owner substitution is what the engine performs on the zone change, so a graveyard card never carries a divergent controller and no reachable state can tell the two reads apart. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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1. CR 602.1a → CR 602.2. Accepted, corrected. 2. CR 702.179d as a cap-lifting exception. Accepted, removed. 702.179d is the inherent once-per-turn speed trigger; 702.179e is the speed-is-4 definition. What 3. Owner-arm production regression. Added
Counter-probe: removing the Measured limit, stated in the file. These rows separate the owner from the other player, not the owner from Evidence gap (parse artifact). Reconciled by making the projection represent the change rather than by explaining the silence. Class re-measured against |
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Inline comments:
In `@crates/engine/tests/integration/max_speed_owner_arm_from_graveyard.rs`:
- Around line 80-83: Update the rules citation in the comment near the
activation-cost explanation to use CR 602.2 instead of CR 602.1a, while
preserving the existing explanation that exiling occurs during payment of the
activation cost.
Apply the same fix in `@crates/engine/src/game/coverage.rs` around lines 3919 -
3942.
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crates/engine/src/ai_support/filter.rscrates/engine/src/game/coverage.rscrates/engine/src/game/restrictions.rscrates/engine/src/parser/oracle.rscrates/engine/src/types/ability.rscrates/engine/tests/integration/main.rscrates/engine/tests/integration/max_speed_owner_arm_from_graveyard.rs
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- crates/engine/src/ai_support/filter.rs
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| /// The outcome is read from the card's ZONE, not from the `Ok`/`Err` of the | ||
| /// submission: "Exile this card from your graveyard" is part of the activation | ||
| /// cost (CR 602.1a), so a genuinely activated ability has already moved the card | ||
| /// to exile. That keeps "accepted" and "accepted but inert" apart. |
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📐 Maintainability & Code Quality | 🟠 Major | ⚡ Quick win
Correct the activation-cost CR reference.
CR 602.1a does not define payment of an activated ability’s costs. Use CR 602.2 for the assertion that exiling the card occurs while paying the activation cost.
Proposed correction
-/// submission: "Exile this card from your graveyard" is part of the activation
-/// cost (CR 602.1a), so a genuinely activated ability has already moved the card
+/// submission: "Exile this card from your graveyard" is part of the activation
+/// cost (CR 602.2), so a genuinely activated ability has already moved the cardAs per path instructions, rules-touching code must use a verified CR citation whose rule body describes the code.
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| /// The outcome is read from the card's ZONE, not from the `Ok`/`Err` of the | |
| /// submission: "Exile this card from your graveyard" is part of the activation | |
| /// cost (CR 602.1a), so a genuinely activated ability has already moved the card | |
| /// to exile. That keeps "accepted" and "accepted but inert" apart. | |
| /// The outcome is read from the card's ZONE, not from the `Ok`/`Err` of the | |
| /// submission: "Exile this card from your graveyard" is part of the activation | |
| /// cost (CR 602.2), so a genuinely activated ability has already moved the card | |
| /// to exile. That keeps "accepted" and "accepted but inert" apart. |
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only still-valid issues, skip the rest with a brief reason, keep changes
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In `@crates/engine/tests/integration/max_speed_owner_arm_from_graveyard.rs` around
lines 80 - 83, Update the rules citation in the comment near the activation-cost
explanation to use CR 602.2 instead of CR 602.1a, while preserving the existing
explanation that exiling occurs during payment of the activation cost.
Apply the same fix in `@crates/engine/src/game/coverage.rs` around lines 3919 -
3942.
Source: Path instructions
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Parse artifact on |
CR 602.2 contains the controller/owner activation permission and its exception; CR 602.1a remains correct for activation costs. Co-authored-by: cuinhellcat <217210902+cuinhellcat@users.noreply.github.com>
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Maintainer fixup |
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Approved at f395f748823a9b024601068b0c1fe28cb9665eea.
The source-relative controller/owner max-speed gate is at the activation-restriction seam, has discriminating production-path coverage for stolen permanents, a permitted non-controller activator, and graveyard activation, and its current SHA has green CI, parse-diff, and CodeRabbit evidence. The remaining CodeRabbit inline suggestion is refuted: CR 602.1a correctly identifies the activation cost; CR 602.2 separately governs who may activate.
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Closes #7517.
Max speed — {T}: Add {R} for each Goblin you controlcould be activated at speed 0. The prefix was recognized and then dropped: the ability reached the battlefield ascondition=None, activation_restrictions=[].The report came from a real game where the Goblin had been stolen, so the first hypothesis was that the engine reads the owner's speed. It reads no one's — the third row below is the one that names the defect.
Measured through
GameAction::ActivateAbilitywith pips counted inplayers[].mana_pool, one variable per row:Rules
CR 702.178a: "Max speed — [Ability]" means "As long as your speed is 4, this object has '[Ability]'." The glossary names whose speed — that permanent's controller (or that card's owner, if it isn't on the battlefield). CR 702.179e defines max speed as speed 4. Gomif-style effects raise that cap by overriding the rule — CR 101.1, not a CR 702.179 subrule (702.179d is the inherent once-per-turn speed trigger).
Because the ability is absent below max speed, the gate is an activation restriction (CR 602.5), not an intervening-if
condition(CR 608.2c + the Shelldock Isle ruling this engine deliberately does not use for activation legality). That is the same reading∞already gets here (CR 702.186b), three lines away.What changed
Four edits, each inside the seam that already owns the concept:
ParsedCondition::HasMaxSpeed— a player-designation leaf, sibling ofHasCityBlessing/HasEnduringStory.ParsedConditionhad no max-speed leaf, which is precisely why the bridge rejected the condition.oracle_condition.rs—StaticCondition::HasMaxSpeedmoves out of the exhaustive bridge's "no exact restriction evaluator" rejection group into the exactly-representable player-state group. That group's comment asks for exactly this: close the gap by aligning the two vocabularies, never by adding a fallback.restrictions.rs— evaluated throughgame::speed::has_max_speed, the same authoritylayers.rsuses for the static reading, so CR 702.179e's speed-is-4 test and the CR 101.1 cap override cannot mean two different things depending on which lane asks. (can_increase_speed_beyond_4already carries the fix(engine): break Speed max-speed static-condition infinite recursion #2553 re-entrancy guard; a restriction check enters through the guarded outer call, not the static scan, so no new recursion path.)oracle.rs— thematches!(aw_condition, Some(SourceIsHarnessed))stamp becomeskeyword_prefix_activation_restriction, which distinguishes the two kinds of em-dash prefix that arrive on the same code path.That last distinction is the load-bearing one, so it is worth stating explicitly:
strip_activated_constraintsalready lowers it. Gating on the label would apply the printed clause twice, and on a card whose label gates only the effect it would refuse an activation the card allows.So the helper is deliberately NOT generic over
ability_word_to_condition's eight entries.an_ability_word_prefix_contributes_no_activation_gatepins that: Mox Opal must come out with exactly one restriction, and it must be the printed artifact count.Scope
17 paper cards (Aetherdrift) print a
Max speed —activated ability, so this is a class: Amonkhet Raceway, Avishkar Raceway, Deviant Skytech, Endrider Catalyzer, Gas Guzzler, Glitch Ghost Surveyor, Goblin Surveyor, Hour of Victory, Howlsquad Heavy, Kickoff Celebrations, Leonin Surveyor, Loxodon Surveyor, Muraganda Raceway, Mutant Surveyor, Perilous Snare, Slick Imitator, Starting Column.Three of the labeled abilities are mana abilities (Endrider Catalyzer, Howlsquad Heavy, Muraganda Raceway) — the worst case, since they bypass the stack (CR 605.3a).
The trigger lane (
ability_word_to_trigger_condition) and the static lane (layers.rs) were already correct; only the activated lane was open. #1213 (Vnwxt, Verbose Host) was the same keyword ungated on a replacement effect and did not touch this path.Tests
crates/engine/tests/integration/howlsquad_max_speed_reads_controller.rs— the three-row measurement above, plus a control row so a failure names the wrong player rather than merely reporting that the ability is unavailable. It also pins, as its own row, thatai_support::legal_actionssurfaces no mana abilities at priority (a plain Mountain is absent too) — that instrument measured nothing when this file first reached for it, and the note exists so the next reader does not repeat it.parser::oracle::tests::max_speed_prefix_gates_only_the_ability_it_labels— Starting Column carries both shapes on one card, so one parse shows the gate landing on the labeled ability while its plain{T}: Add one mana of any colorstays ungated.parser::oracle::tests::max_speed_prefix_gates_a_labeled_mana_ability— the mana lane.parser::oracle::tests::an_ability_word_prefix_contributes_no_activation_gate— the CR 207.2c counter-case.Counter-probe. Replacing the new
oracle.rsarm withStaticCondition::HasMaxSpeed => Nonedrops four rows:Both control rows stay green under the probe (
the_controller_at_max_speed_may_activate_it, and the mana-ability harness row), so the fix is not over-suppressing.an_ability_word_prefix_contributes_no_activation_gatealso stays green under the probe — it is a pin against a future over-generic seam, not evidence for this change. Stating that rather than counting it as a fifth proof.cargo test -p phase-engine: 5204 passed, 0 failed.cargo fmt --allandcargo clippy -p phase-engine --all-targets -D warningsclean; the full pre-push chain passed. (Tilt was not running in this checkout; commands were run directly.)Not covered
No card currently prints "Activate only if you have max speed" as a standalone clause, so the bridge widening has no card-facing effect today beyond enabling the seam above. Surge of Acclaim's "If you have max speed, choose both instead" is an
AbilityConditionand takes a different path.Summary by CodeRabbit
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