Public

Implement Ward Keyword Effect and Update CardsPublic

The user aimed to implement the Ward keyword effect in a game engine by adding the necessary code, updating seven cards across three sets, and ensuring all related tests passed. They thoroughly investigated existing code and card data, made the required changes, updated documentation, and verified that everything compiled and tested successfully. The task was completed with all tests passing and the work queue updated accordingly.

Agent

Claude Code

Model

Claude Opus 4.6

Shared

Feb 14, 11:00 PM

Messages182

Session command

Read docs/work-queue.md and do the next unchecked batch. For each batch:

Read the engine files (mtg-engine/src/abilities.rs, mtg-engine/src/game.rs) to understand current Effect/StaticEffect variants
If the batch has a NOTE about uncertainty, investigate first and update the queue with findings before committing the fix
If engine work is needed: add the variant, constructor, and match arm, and look for the Java implementation to see the bigger picture
Add a test for any new engine effect (follow the pattern in game.rs mod tests)
Fix all cards listed in the batch (grep to find exact lines, fix across all 4 set files)
cargo check -p mtg-cards && cargo test --lib
Update docs: mark cards in docs/{fdn,tla,tdm,ecl}-remediation.md, update ROADMAP.md
Check off the batch in docs/work-queue.md with today's date
If you discover new cards that fit the current or a future batch while working, add them to the queue

If a batch turns out to be wrong or more complex than described, update the queue with what you learned and move on to the next one.

I'll start by reading the work queue to find the next unchecked batch.

Readwork-queue.md

The next batch is Batch 5: Ward keyword. Let me read the engine files and investigate the cards.

Readabilities.rs

Readgame.rs

GreppedWard

Let me search for the Ward cards and read the relevant parts of game.rs.

GreppedWard

GreppedStaticEffect::

GreppedKeywordAbilities

Let me understand how static effects are processed and find where Ward should be implemented.

Greppedstatic_effect

Let me look at the specific card implementations and how keywords are set.

Readtdm.rs20 lines

Readecl.rs25 lines

Readfdn.rs45 lines

Let me find the FDN card at line ~5602 and the TDM card at ~4070 (the "Ward -- Discard a card" one).

Readfdn.rs25 lines

Readtdm.rs25 lines

Let me check the keywords field for Ambling Stormshell since it wasn't visible in the snippet.

Readtdm.rs10 lines

Now I have all the context. Let me check how the default keywords work and then look at the game.rs test section for the test pattern.

Greppedimpl Default for CardData

Readgame.rs50 lines

Good, default keywords are empty(). Now let me read the test section in game.rs to follow the pattern.

Grepped^mod tests|^ mod tests|#\[cfg\(test\)\]

Readgame.rs100 lines

Let me find the end of the tests module in game.rs.

Readgame.rs41 lines

Now I have all the context. Let me implement Batch 5: Ward keyword.

Plan:

Add StaticEffect::Ward { cost: String } variant + builder
Add test for the builder
Fix all 7 cards across 3 set files (replace Custom, add WARD keyword flags)
Fix Tolarian Terror (add missing Ward ability)
Build & test

Let me start with the engine changes.

Now add the builder method in the impl StaticEffect block.

Now add a test for the Ward builder.

Good. Now fix all the cards. Let me do them in parallel using sed commands.

Now add KeywordAbilities::WARD to the keyword flags for each card. Let me do them one by one.

Now fix Tolarian Terror — it has keywords: KeywordAbilities::WARD but no Ward static ability. I need to add a Ward ability to its abilities vec.

Readfdn.rs15 lines

Now let me verify all changes are correct by checking the relevant lines.

All 7 instances replaced. Let me verify the keyword flags too.

I'm missing some keyword additions. Let me check those specific lines.

Readtdm.rs6 lines

Readfdn.rs6 lines

The line numbers shifted. Let me fix the remaining cards.

Let me verify all WARD keywords are now set.

All 7 cards have WARD keyword flags. Now let me build and test.

Clean compilation. Now run the tests.

All 249 tests pass (including the new Ward builder test in static_effect_builders). Now let me update the documentation.

Readfdn-remediation.md30 lines

Readtdm-remediation.md30 lines

Readecl-remediation.md30 lines

Let me find the relevant sections in each remediation doc where these cards would be listed, and also the ROADMAP.

GreppedCackling Prowler|Tolarian Terror

GreppedAegis Sculptor|Ambling Stormshell|Dirgur Island Dragon|Scavenger Regent

GreppedBristlebane Battler

ReadROADMAP.md

Let me update the card entries in each remediation doc. First, let me find the exact lines.

GreppedCackling Prowler

GreppedTolarian Terror

GreppedAegis Sculptor|Ambling Stormshell|Dirgur Island Dragon|Scavenger Regent

GreppedBristlebane Battler

Now let me update each remediation doc.

Now update ROADMAP.md — add Ward as a note in the "Recently implemented" section.

ReadROADMAP.md5 lines

Now check off Batch 5 in the work queue.

Let me do one final verification that everything still compiles and tests pass.

All 249 tests pass. Let me also quickly check if there are any other Ward Custom variants I might have missed elsewhere.

GreppedCustom.*[Ww]ard

Those are false positives ("Cowards" and "Forward"). No remaining Ward Custom variants.

Batch 5 complete. Here's a summary:

Engine changes:

Added StaticEffect::Ward { cost: String } variant to the enum
Added StaticEffect::ward(cost) builder method
Extended static_effect_builders test with Ward variant checks

Cards fixed (7 across 3 sets):

TDM (4): Aegis Sculptor, Ambling Stormshell, Dirgur Island Dragon, Scavenger Regent
ECL (1): Bristlebane Battler
FDN (2): Cackling Prowler, Tolarian Terror

What was done for each card:

Replaced StaticEffect::Custom("Ward {2}") / Custom("Ward -- Discard a card.") with typed StaticEffect::ward("{2}") / ward("Discard a card.")
Added KeywordAbilities::WARD to the keyword flags (5 cards were missing it)
Tolarian Terror already had the WARD keyword flag but was missing the Ward static ability — added it

Note: Ward is now stored as structured data. The mechanical enforcement (counter-unless-pay during targeting) would require full targeting/stack interaction and is deferred. All 249 tests pass.