Create CLAUDE.md for Codebase GuidancePublic

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Feb 13, 4:56 PM

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Summary

Please analyze this codebase and create a CLAUDE.md file, which will be given to future instances of Claude Code to operate in this repository.

What to add:

Commands that will be commonly used, such as how to build, lint, and run tests. Include the necessary commands to develop in this codebase, such as how to run a single test.
High-level code architecture and structure so that future instances can be productive more quickly. Focus on the "big picture" architecture that requires reading multiple files to understand.

Usage notes:

If there's already a CLAUDE.md, suggest improvements to it.
When you make the initial CLAUDE.md, do not repeat yourself and do not include obvious instructions like "Provide helpful error messages to users", "Write unit tests for all new utilities", "Never include sensitive information (API keys, tokens) in code or commits".
Avoid listing every component or file structure that can be easily discovered.
Don't include generic development practices.
If there are Cursor rules (in .cursor/rules/ or .cursorrules) or Copilot rules (in .github/copilot-instructions.md), make sure to include the important parts.
If there is a README.md, make sure to include the important parts.
Do not make up information such as "Common Development Tasks", "Tips for Development", "Support and Documentation" unless this is expressly included in other files that you read.
Be sure to prefix the file with the following text:

# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Your account does not have access to Claude Code. Please run /login.

Caveat: The messages below were generated by the user while running local commands. DO NOT respond to these messages or otherwise consider them in your response unless the user explicitly asks you to.

Caveat: Caveat: The messages below were generated by the user while running local commands. DO NOT respond to these messages or otherwise consider them in your response unless the user explicitly asks you to.

Please analyze this codebase and create a CLAUDE.md file, which will be given to future instances of Claude Code to operate in this repository.

What to add:

Commands that will be commonly used, such as how to build, lint, and run tests. Include the necessary commands to develop in this codebase, such as how to run a single test.
High-level code architecture and structure so that future instances can be productive more quickly. Focus on the "big picture" architecture that requires reading multiple files to understand.

Usage notes:

If there's already a CLAUDE.md, suggest improvements to it.
When you make the initial CLAUDE.md, do not repeat yourself and do not include obvious instructions like "Provide helpful error messages to users", "Write unit tests for all new utilities", "Never include sensitive information (API keys, tokens) in code or commits".
Avoid listing every component or file structure that can be easily discovered.
Don't include generic development practices.
If there are Cursor rules (in .cursor/rules/ or .cursorrules) or Copilot rules (in .github/copilot-instructions.md), make sure to include the important parts.
If there is a README.md, make sure to include the important parts.
Do not make up information such as "Common Development Tasks", "Tips for Development", "Support and Documentation" unless this is expressly included in other files that you read.
Be sure to prefix the file with the following text:

# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

I'll analyze the codebase in parallel to understand its structure, build system, and architecture.

Ran sub-agentExplore codebase structure

Ran sub-agentExplore code architecture

Now let me read a few key files directly for accuracy.

ReadMakefile

Readreadme.md

Readpom.xml50 lines

Ran sub-agentExplore test and card patterns

<retrieval_status>success</retrieval_status>

<task_id>a3064fb</task_id>

<task_type>local_agent</task_type>

<status>failed</status>

<output>
[Truncated. Full output: /tmp/claude-1000/-mnt-dest-btrfs-home-jc-src-mage/tasks/a3064fb.output]

lUse:Read","command":"callback"},"parentToolUseID":"toolu_01NSm1zmATUeijaw6tVwEFZ2","toolUseID":"toolu_01NSm1zmATUeijaw6tVwEFZ2","timestamp":"2026-02-13T16:33:39.987Z","uuid":"99580570-3219-40c9-8c79-00bdc4ba4577"}
{"parentUuid":"dfc4a3a8-88ee-40d9-a3a4-16bd08e9a800","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01NSm1zmATUeijaw6tVwEFZ2","type":"tool_result","content":"  2256→    public void block(int turnNum, TestPlayer player, String blocker, String attacker) {\n  2257→        Assert.assertNotEquals(\"\", attacker);\n  2258→        attacker = EmptyNames.replaceTestCommandByObjectName(attacker);\n  2259→        Assert.assertNotEquals(\"\", blocker);\n  2260→        blocker = EmptyNames.replaceTestCommandByObjectName(blocker);\n  2261→\n  2262→        assertAliaseSupportInActivateCommand(blocker, false); // it uses old special notation like card_name:index\n  2263→        assertAliaseSupportInActivateCommand(attacker, false);\n  2264→        addPlayerAction(player, turnNum, PhaseStep.DECLARE_BLOCKERS, \"block:\" + blocker + '$' + attacker);\n  2265→    }\n  2266→\n  2267→    public void blockSkip(int turnNum, TestPlayer player) {\n  2268→        block(turnNum, player, TestPlayer.BLOCK_SKIP, TestPlayer.ATTACK_SKIP);\n  2269→    }\n  2270→\n  2271→    /**\n  2272→     * For use choices set \"Yes\" or \"No\" the choice string or use boolean.<br>\n  2273→     * For X values set \"X=[xValue]\" example: for X=3 set choice string to\n  2274→     * \"X=3\".<br>\n  2275→     * For ColorChoice use \"Red\", \"Green\", \"Blue\", \"Black\" or \"White\"<br>\n  2276→     * use command setModeChoice if you have to set a mode from modal\n  2277→     * ability<br>\n  2278→     *\n  2279→     * @param player\n  2280→     * @param choice\n  2281→     */\n  2282→    public void setChoice(TestPlayer player, boolean choice) {\n  2283→        setChoice(player, choice, 1);\n  2284→    }\n  2285→\n  2286→    public void setChoice(TestPlayer player, boolean choice, int timesToChoose) {\n  2287→        setChoice(player, choice ? \"Yes\" : \"No\", timesToChoose);\n  2288→    }\n  2289→\n  2290→    /**\n  2291→     * Declare non target choice. You can use multiple choices in one line like setChoice(name1^name2)\n  2292→     * Also support \"up to\" choices, e.g. choose 2 of 3 cards by setChoice(card1^card2) + setChoice(TestPlayer.CHOICE_SKIP)\n  2293→     */\n  2294→    public void setChoice(TestPlayer player, String choice) {\n  2295→        setChoice(player, choice, 1);\n  2296→    }\n  2297→\n  2298→    public void setChoice(TestPlayer player, String choice, int timesToChoose) {\n  2299→        if (choice.equals(TestPlayer.TARGET_SKIP)) {\n  2300→            Assert.fail(\"setChoice allow only TestPlayer.CHOICE_SKIP, but found \" + choice);\n  2301→        }\n  2302→        for (int i = 0; i < timesToChoose; i++) {\n  2303→            player.addChoice(choice);\n  2304→        }\n  2305→    }\n  2306→\n  2307→    /**\n  2308→     * Setup amount choices.\n  2309→     * <p>\n  2310→     * Multi amount choices uses WUBRG order (so use 1,2,3,4,5 values list)\n  2311→     *\n  2312→     * @param player\n  2313→     * @param amountList\n  2314→     */\n  2315→    public void setChoiceAmount(TestPlayer player, int... amountList) {\n  2316→        for (int amount : amountList) {\n  2317→            setChoice(player, \"X=\" + amount);\n  2318→        }\n  2319→    }\n  2320→\n  2321→    /**\n  2322→     * Set the modes for modal spells\n  2323→     *\n  2324→     * @param player\n  2325→     * @param choice starting with \"1\" for mode 1, \"2\" for mode 2 and so on (to\n  2326→     *               set multiple modes call the command multiple times). If a\n  2327→     *               spell mode can be used only once like Demonic Pact, the\n  2328→     *               value has to be set to the number of the remaining modes\n  2329→     *               (e.g. if only 2 are left the number need to be 1 or 2).\n  2330→     *               If you need to partly select then use TestPlayer.MODE_SKIP\n  2331→     */\n  2332→    public void setModeChoice(TestPlayer player, String choice) {\n  2333→        player.addModeChoice(choice);\n  2334→    }\n  2335→"}]},"uuid":"1038e7a9-7bd4-48cd-bb0a-4be7cc1829e3","timestamp":"2026-02-13T16:33:39.986Z","sourceToolAssistantUUID":"dfc4a3a8-88ee-40d9-a3a4-16bd08e9a800"}
{"parentUuid":"1038e7a9-7bd4-48cd-bb0a-4be7cc1829e3","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_01AQFFYzkgiat4eHrkKaRzEx","type":"message","role":"assistant","content":[{"type":"text","text":"Perfect! Now let me check the assertPermanentCount and assertLife methods:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":1451,"cache_read_input_tokens":38956,"cache_creation":{"ephemeral_5m_input_tokens":1451,"ephemeral_1h_input_tokens":0},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6PcNgNY4w4HHodjR1fa","type":"assistant","uuid":"ea9b0dea-5ea6-43f5-ac21-100e8e4ab200","timestamp":"2026-02-13T16:33:41.196Z"}
{"parentUuid":"ea9b0dea-5ea6-43f5-ac21-100e8e4ab200","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_01AQFFYzkgiat4eHrkKaRzEx","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_017th6WHkCcNaniR8JLAibMH","name":"Read","input":{"file_path":"/mnt/dest-btrfs/home/jc/src/mage/Mage.Tests/src/test/java/org/mage/test/serverside/base/impl/CardTestPlayerAPIImpl.java","offset":942,"limit":50}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":1451,"cache_read_input_tokens":38956,"cache_creation":{"ephemeral_5m_input_tokens":1451,"ephemeral_1h_input_tokens":0},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6PcNgNY4w4HHodjR1fa","type":"assistant","uuid":"b06508d9-d173-41e8-a76e-aae09b13c187","timestamp":"2026-02-13T16:33:42.169Z"}
{"parentUuid":"b06508d9-d173-41e8-a76e-aae09b13c187","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_017th6WHkCcNaniR8JLAibMH","toolUseID":"toolu_017th6WHkCcNaniR8JLAibMH","timestamp":"2026-02-13T16:33:42.176Z","uuid":"f260285d-7c0c-4a6e-9eeb-b128b622a25d"}
{"parentUuid":"b06508d9-d173-41e8-a76e-aae09b13c187","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_017th6WHkCcNaniR8JLAibMH","type":"tool_result","content":"   942→    public void assertLife(Player player, int life) throws AssertionError {\n   943→        int actual = currentGame.getPlayer(player.getId()).getLife();\n   944→        Assert.assertEquals(\"Life amounts are not equal for player \" + player.getName(), life, actual);\n   945→    }\n   946→\n   947→    @Override\n   948→    public void assertPowerToughness(Player player, String cardName, int powerNeeded, int toughnessNeeded, Filter.ComparisonScope scope, boolean checkBaseValues) throws AssertionError {\n   949→        Assert.assertNotEquals(\"\", cardName);\n   950→        cardName = EmptyNames.replaceTestCommandByObjectName(cardName);\n   951→\n   952→        int count = 0;\n   953→        int fit = 0;\n   954→        int foundPower = 0;\n   955→        int foundToughness = 0;\n   956→        int found = 0;\n   957→        for (Permanent permanent : currentGame.getBattlefield().getAllPermanents()) {\n   958→            if (!isObjectHaveTargetNameOrAlias(player, permanent, cardName) || !permanent.getControllerId().equals(player.getId())) {\n   959→                continue;\n   960→            }\n   961→            int powerFound = checkBaseValues ? permanent.getPower().getModifiedBaseValue() : permanent.getPower().getValue();\n   962→            int toughnessFound = checkBaseValues ? permanent.getToughness().getModifiedBaseValue() : permanent.getToughness().getValue();\n   963→\n   964→            count++;\n   965→            if (scope == Filter.ComparisonScope.All) {\n   966→                Assert.assertEquals((checkBaseValues ? \"Base power\" : \"Power\") + \" is not the same (\" + powerNeeded + \" vs. \" + powerFound + ')',\n   967→                        powerNeeded, powerFound);\n   968→                Assert.assertEquals((checkBaseValues ? \"Base toughness\" : \"Toughness\") + \" is not the same (\" + toughnessNeeded + \" vs. \" + toughnessFound + ')',\n   969→                        toughnessNeeded, toughnessFound);\n   970→            } else if (scope == Filter.ComparisonScope.Any) {\n   971→                if (powerNeeded == powerFound && toughnessNeeded == toughnessFound) {\n   972→                    fit++;\n   973→                    break;\n   974→                }\n   975→                found++;\n   976→                foundPower = powerFound;\n   977→                foundToughness = toughnessFound;\n   978→            }\n   979→        }\n   980→\n   981→        assertTrue(\"There is no such permanent under player's control, player=\" + player.getName()\n   982→                + \", cardName=\" + cardName, count > 0);\n   983→\n   984→        if (scope == Filter.ComparisonScope.Any) {\n   985→            assertTrue(\"There is no such creature under player's control with specified\" + (checkBaseValues ? \" base \" : ' ') + \"p/t of \" + powerNeeded + '/' + toughnessNeeded + \", player=\" + player.getName()\n   986→                    + \", cardName=\" + cardName + \" (found similar: \" + found + \", one of them: power=\" + foundPower + \" toughness=\" + foundToughness + ')', fit > 0);\n   987→        }\n   988→    }\n   989→\n   990→    public void assertPowerToughness(Player player, String cardName, int power, int toughness, Filter.ComparisonScope scope) {\n   991→        assertPowerToughness(player, cardName, power, toughness, scope, false);"}]},"uuid":"d880acbf-6bf4-4a51-9804-3702c8ba1978","timestamp":"2026-02-13T16:33:42.176Z","sourceToolAssistantUUID":"b06508d9-d173-41e8-a76e-aae09b13c187"}
{"parentUuid":"d880acbf-6bf4-4a51-9804-3702c8ba1978","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_013pDCMPYtEHpCjBFEiFu9Am","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01J5MSEFjTyP4zk3Gp9eo9UY","name":"Read","input":{"file_path":"/mnt/dest-btrfs/home/jc/src/mage/Mage.Tests/src/test/java/org/mage/test/serverside/base/impl/CardTestPlayerAPIImpl.java","offset":1117,"limit":50}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":1138,"cache_read_input_tokens":40407,"cache_creation":{"ephemeral_5m_input_tokens":1138,"ephemeral_1h_input_tokens":0},"output_tokens":18,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6PcXvjk5QUztgrL7Mg1","type":"assistant","uuid":"f2462a2a-b7ec-4153-9744-66d58d48fc27","timestamp":"2026-02-13T16:33:44.059Z"}
{"parentUuid":"f2462a2a-b7ec-4153-9744-66d58d48fc27","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01J5MSEFjTyP4zk3Gp9eo9UY","toolUseID":"toolu_01J5MSEFjTyP4zk3Gp9eo9UY","timestamp":"2026-02-13T16:33:44.069Z","uuid":"ef817d39-7c05-4c75-aa25-63fdb8f553a7"}
{"parentUuid":"f2462a2a-b7ec-4153-9744-66d58d48fc27","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01J5MSEFjTyP4zk3Gp9eo9UY","type":"tool_result","content":"  1117→    public void assertPermanentCount(Player player, String cardName, int count) throws AssertionError {\n  1118→        Assert.assertNotEquals(\"\", cardName);\n  1119→        cardName = EmptyNames.replaceTestCommandByObjectName(cardName);\n  1120→\n  1121→        int actualCount = 0;\n  1122→        for (Permanent permanent : currentGame.getBattlefield().getAllActivePermanents()) {\n  1123→            if (permanent.getControllerId().equals(player.getId())) {\n  1124→                if (isObjectHaveTargetNameOrAlias(player, permanent, cardName)) {\n  1125→                    actualCount++;\n  1126→                }\n  1127→            }\n  1128→        }\n  1129→        Assert.assertEquals(\"(Battlefield) Permanents counts for \" + player.getName() + \" are not equal (\" + cardName + ')', count, actualCount);\n  1130→    }\n  1131→\n  1132→    @Override\n  1133→    public void assertTokenCount(Player player, String tokenName, int count) throws AssertionError {\n  1134→        Assert.assertNotEquals(\"\", tokenName);\n  1135→        tokenName = EmptyNames.replaceTestCommandByObjectName(tokenName);\n  1136→\n  1137→        int actualCount = 0;\n  1138→        for (Permanent permanent : currentGame.getBattlefield().getAllActivePermanents()) {\n  1139→            if (permanent instanceof PermanentToken\n  1140→                    && permanent.getControllerId().equals(player.getId())\n  1141→                    && isObjectHaveTargetNameOrAlias(player, permanent, tokenName)) {\n  1142→                actualCount++;\n  1143→            }\n  1144→        }\n  1145→        Assert.assertEquals(\"(Battlefield) Tokens counts for \" + player.getName() + \" are not equal (\" + tokenName + ')', count, actualCount);\n  1146→    }\n  1147→\n  1148→    @Override\n  1149→    public void assertCommandZoneCount(Player player, String commandZoneObjectName, int count) throws AssertionError {\n  1150→        Assert.assertNotEquals(\"\", commandZoneObjectName);\n  1151→        commandZoneObjectName = EmptyNames.replaceTestCommandByObjectName(commandZoneObjectName);\n  1152→\n  1153→        int actualCount = 0;\n  1154→        for (CommandObject commandObject : currentGame.getState().getCommand()) {\n  1155→            if (commandObject.getControllerId().equals(player.getId()) && isObjectHaveTargetNameOrAlias(player, commandObject, commandZoneObjectName)) {\n  1156→                actualCount++;\n  1157→            }\n  1158→        }\n  1159→        Assert.assertEquals(\"(Command Zone) Card counts are not equal (\" + commandZoneObjectName + ')', count, actualCount);\n  1160→    }\n  1161→\n  1162→    /**\n  1163→     * Assert emblem count under player's control\n  1164→     *\n  1165→     * @param player\n  1166→     * @param count"}]},"uuid":"26058347-0ef1-4daa-bb22-f3be8d67b5bb","timestamp":"2026-02-13T16:33:44.069Z","sourceToolAssistantUUID":"f2462a2a-b7ec-4153-9744-66d58d48fc27"}
{"parentUuid":"26058347-0ef1-4daa-bb22-f3be8d67b5bb","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_01D7eYwMPWKUp2Smu774RnXm","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me create a comprehensive summary. Let me also check the setStopAt and execute methods:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":992,"cache_read_input_tokens":41545,"cache_creation":{"ephemeral_5m_input_tokens":992,"ephemeral_1h_input_tokens":0},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6Pcg9bNrmCR8VY7eC44","type":"assistant","uuid":"5b66524d-8d39-41db-9d4e-a28d609cf041","timestamp":"2026-02-13T16:33:45.291Z"}
{"parentUuid":"5b66524d-8d39-41db-9d4e-a28d609cf041","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_01D7eYwMPWKUp2Smu774RnXm","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01XSDyUeCqNS68L694jARdvX","name":"Read","input":{"file_path":"/mnt/dest-btrfs/home/jc/src/mage/Mage.Tests/src/test/java/org/mage/test/serverside/base/impl/CardTestPlayerAPIImpl.java","offset":244,"limit":80}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":992,"cache_read_input_tokens":41545,"cache_creation":{"ephemeral_5m_input_tokens":992,"ephemeral_1h_input_tokens":0},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6Pcg9bNrmCR8VY7eC44","type":"assistant","uuid":"fd3a24b5-405a-4d30-bafd-b6d96362cd71","timestamp":"2026-02-13T16:33:45.735Z"}
{"parentUuid":"fd3a24b5-405a-4d30-bafd-b6d96362cd71","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01XSDyUeCqNS68L694jARdvX","toolUseID":"toolu_01XSDyUeCqNS68L694jARdvX","timestamp":"2026-02-13T16:33:45.748Z","uuid":"c790424c-d342-41ec-9d97-9eb58a362c52"}
{"parentUuid":"fd3a24b5-405a-4d30-bafd-b6d96362cd71","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01XSDyUeCqNS68L694jARdvX","type":"tool_result","content":"   244→    public void execute() throws IllegalStateException {\n   245→        if (currentGame == null || activePlayer == null) {\n   246→            throw new IllegalStateException(\"Game is not initialized. Use load method to load a test case and initialize a game.\");\n   247→        }\n   248→\n   249→        ThreadUtils.ensureRunInGameThread();\n   250→\n   251→        DataCollectorServices.init(\n   252→                true,\n   253→                DebugUtil.TESTS_DATA_COLLECTORS_ENABLE_SAVE_GAME_HISTORY\n   254→        );\n   255→\n   256→        // check stop command\n   257→        int maxTurn = 1;\n   258→        int maxPhase = 0;\n   259→        for (Player player : currentGame.getPlayers().values()) {\n   260→            if (player instanceof TestPlayer) {\n   261→                TestPlayer testPlayer = (TestPlayer) player;\n   262→                for (PlayerAction action : testPlayer.getActions()) {\n   263→                    assertTrue(\"Wrong turn in action \" + action.getTurnNum(), action.getTurnNum() >= 1);\n   264→                    int curTurn = action.getTurnNum();\n   265→                    int curPhase = action.getStep().getIndex();\n   266→                    if ((curTurn > maxTurn) || (curTurn == maxTurn && curPhase > maxPhase)) {\n   267→                        maxTurn = curTurn;\n   268→                        maxPhase = curPhase;\n   269→                    }\n   270→                }\n   271→            }\n   272→        }\n   273→        Assert.assertFalse(\"Wrong stop command on \" + this.stopOnTurn + \" / \" + this.stopAtStep + \" (\" + this.stopAtStep.getIndex() + \")\"\n   274→                        + \" (found actions after stop on \" + maxTurn + \" / \" + maxPhase + \")\",\n   275→                (maxTurn > this.stopOnTurn) || (maxTurn == this.stopOnTurn && maxPhase > this.stopAtStep.getIndex()));\n   276→\n   277→        // check commands order\n   278→        for (Player player : currentGame.getPlayers().values()) {\n   279→            if (true) break; // TODO: delete/comment and fix all failed tests\n   280→            if (player instanceof TestPlayer) {\n   281→                TestPlayer testPlayer = (TestPlayer) player;\n   282→                int lastActionIndex = 0;\n   283→                PlayerAction lastAction = null;\n   284→                for (PlayerAction currentAction : testPlayer.getActions()) {\n   285→                    int currentActionIndex = 1000 * currentAction.getTurnNum() + currentAction.getStep().getIndex();\n   286→                    if (currentActionIndex < lastActionIndex) {\n   287→                        // how-to fix: find typo in step/turn number\n   288→                        Assert.fail(\"Found wrong commands order for \" + testPlayer.getName() + \":\" + \"\\n\"\n   289→                                + lastAction + \"\\n\"\n   290→                                + currentAction);\n   291→                    } else {\n   292→                        lastActionIndex = currentActionIndex;\n   293→                        lastAction = currentAction;\n   294→                    }\n   295→                }\n   296→            }\n   297→        }\n   298→\n   299→        if (!currentGame.isPaused()) {\n   300→            // workaround to fill range info (cause real range fills after game start, but some cheated cards needs range on ETB)\n   301→            for (Player player : currentGame.getPlayers().values()) {\n   302→                player.updateRange(currentGame);\n   303→            }\n   304→            // add cards to game\n   305→            for (Player player : currentGame.getPlayers().values()) {\n   306→                TestPlayer testPlayer = (TestPlayer) player;\n   307→                currentGame.cheat(testPlayer.getId(), getCommands(testPlayer));\n   308→                currentGame.cheat(testPlayer.getId(), getLibraryCards(testPlayer), getHandCards(testPlayer),\n   309→                        getBattlefieldCards(testPlayer), getGraveCards(testPlayer), getCommandCards(testPlayer),\n   310→                        getExiledCards(testPlayer));\n   311→\n   312→            }\n   313→        }\n   314→\n   315→        long t1 = System.nanoTime();\n   316→\n   317→        gameOptions.testMode = true;\n   318→        gameOptions.stopOnTurn = stopOnTurn;\n   319→        gameOptions.stopAtStep = stopAtStep;\n   320→        currentGame.setGameOptions(gameOptions);\n   321→        if (currentGame.isPaused()) {\n   322→            currentGame.resume();// needed if execute() is performed multiple times\n   323→        }"}]},"uuid":"53749e62-ce53-450d-a90a-b96fd91ad8b3","timestamp":"2026-02-13T16:33:45.748Z","sourceToolAssistantUUID":"fd3a24b5-405a-4d30-bafd-b6d96362cd71"}
{"parentUuid":"53749e62-ce53-450d-a90a-b96fd91ad8b3","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_01QgbMvoXejMbgofo2mE8AE6","type":"message","role":"assistant","content":[{"type":"text","text":"Let me find setStopAt:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":1425,"cache_read_input_tokens":42537,"cache_creation":{"ephemeral_5m_input_tokens":1425,"ephemeral_1h_input_tokens":0},"output_tokens":3,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6PcoHxY678iWAJfE3CA","type":"assistant","uuid":"cdcdf174-af7d-4bd0-b55e-08a4b377fdc1","timestamp":"2026-02-13T16:33:47.019Z"}
{"parentUuid":"cdcdf174-af7d-4bd0-b55e-08a4b377fdc1","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_01QgbMvoXejMbgofo2mE8AE6","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01DX8S9MdZkav1HfiYNAv438","name":"Bash","input":{"command":"grep -n \"public void setStopAt\\|public void setStop\" /mnt/dest-btrfs/home/jc/src/mage/Mage.Tests/src/test/java/org/mage/test/serverside/base/impl/CardTestPlayerAPIImpl.java"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":1425,"cache_read_input_tokens":42537,"cache_creation":{"ephemeral_5m_input_tokens":1425,"ephemeral_1h_input_tokens":0},"output_tokens":3,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6PcoHxY678iWAJfE3CA","type":"assistant","uuid":"e2cf6995-d602-4a5b-81ce-4cc2d1347f50","timestamp":"2026-02-13T16:33:48.150Z"}
{"parentUuid":"e2cf6995-d602-4a5b-81ce-4cc2d1347f50","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01DX8S9MdZkav1HfiYNAv438","type":"tool_result","content":"875:    public void setStopOnTurn(int turn) {\n887:    public void setStopAt(int turn, PhaseStep step) {","is_error":false}]},"uuid":"7854bf09-ff40-4325-8bfe-77125d6c9f9e","timestamp":"2026-02-13T16:33:48.199Z","sourceToolAssistantUUID":"e2cf6995-d602-4a5b-81ce-4cc2d1347f50"}
{"parentUuid":"7854bf09-ff40-4325-8bfe-77125d6c9f9e","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","message":{"model":"claude-haiku-4-5-20251001","id":"msg_01B4HbFSXC1UhDKZqpF4KgAa","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01GkBGgscCbhsBSZTGjbS1K2","name":"Read","input":{"file_path":"/mnt/dest-btrfs/home/jc/src/mage/Mage.Tests/src/test/java/org/mage/test/serverside/base/impl/CardTestPlayerAPIImpl.java","offset":875,"limit":30}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"cache_creation_input_tokens":213,"cache_read_input_tokens":43962,"cache_creation":{"ephemeral_5m_input_tokens":213,"ephemeral_1h_input_tokens":0},"output_tokens":18,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CY6PcybLNBaSz2ZtHWTYw","type":"assistant","uuid":"3d645560-69c4-4d62-ba21-2b91b3a3bd77","timestamp":"2026-02-13T16:33:49.535Z"}
{"parentUuid":"3d645560-69c4-4d62-ba21-2b91b3a3bd77","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01GkBGgscCbhsBSZTGjbS1K2","toolUseID":"toolu_01GkBGgscCbhsBSZTGjbS1K2","timestamp":"2026-02-13T16:33:49.547Z","uuid":"542c4fb4-d507-4561-a231-1480a8c9faf8"}
{"parentUuid":"3d645560-69c4-4d62-ba21-2b91b3a3bd77","isSidechain":true,"userType":"external","cwd":"/mnt/dest-btrfs/home/jc/src/mage","sessionId":"5eb0b0f1-08c6-4650-b490-c6548802b68f","version":"2.1.41","gitBranch":"master","agentId":"a3064fb","slug":"linked-booping-treasure","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01GkBGgscCbhsBSZTGjbS1K2","type":"tool_result","content":"   875→    public void setStopOnTurn(int turn) {\n   876→        setStopAt(turn, PhaseStep.UNTAP);\n   877→    }\n   878→\n   879→    /**\n   880→     * Define turn number and step to stop the game on. The game stops after\n   881→     * executing the step\n   882→     *\n   883→     * @param turn\n   884→     * @param step\n   885→     */\n   886→    @Override\n   887→    public void setStopAt(int turn, PhaseStep step) {\n   888→        assertTrue(\"Wrong turn \" + turn, turn >= 1);\n   889→        stopOnTurn = turn;\n   890→        stopAtStep = step;\n   891→    }\n   892→\n   893→    /**\n   894→     * Assert turn number after test execution.\n   895→     *\n   896→     * @param turn Expected turn number to compare with. 1-based.\n   897→     */\n   898→    @Override\n   899→    public void assertTurn(int turn) throws AssertionError {\n   900→        Assert.assertEquals(\"Turn numbers are not equal\", turn, currentGame.getTurnNum());\n   901→    }\n   902→\n   903→    /**\n   904→     * Assert game result after test execution."}]},"uuid":"1facb9d7-ee35-46f4-95f4-e5e56d0ec1fa","timestamp":"2026-02-13T16:33:49.546Z","sourceToolAssistantUUID":"3d645560-69c4-4d62-ba21-2b91b3a3bd77"}
</output>

<error>classifyHandoffIfNeeded is not defined</error>

The agent hit an error but returned useful data. Let me read a few more key files directly.

Searched filesMage.Tests/src/test/java/org/mage/test/cards/single/**/*Test.javain //mnt/dest-btrfs/home/jc/src/mage

Searched filesMage.Sets/src/mage/cards/a/A*.javain //mnt/dest-btrfs/home/jc/src/mage

ReadAbbeyGriffin.java

ReadPowerWordKillTest.java

ReadCardTestPlayerBase.java

Now let me check the Mage.Tests pom.xml for surefire configuration and how to run a single test.

Readpom.xml

Searched filesMage/src/main/java/mage/constants/SubType.javain //mnt/dest-btrfs/home/jc/src/mage

ReadSubType.java80 lines

GreppedfromString|chooseSubType

ReadAbruptDecay.java

Let me also look at how sets register their cards and the card file naming convention.

Searched filesMage.Sets/src/mage/sets/*.javain //mnt/dest-btrfs/home/jc/src/mage

ReadAmonkhet.java30 lines

GreppedbyDescription

Now I have enough information. Let me create the CLAUDE.md file.

Created CLAUDE.md with:

Build commands — make build, mvn test, single test execution with -Dtest= and -pl Mage.Tests
Module architecture — All 9 modules with their purpose and package structure
Card implementation pattern — Complete example with conventions (final class, copy constructor, singleton keyword abilities, filter patterns)
Core abstractions — Ability/Effect hierarchy, 7-layer continuous effect system, key constants
SubType gotcha — byDescription() for card code vs fromString() for tests only
Test framework — Full example test with the declarative API, all key assertion/action methods, test file organization
Event system and plugin architecture — How game variants and extensions work

<task-notification> <task-id>a3064fb</task-id> <status>failed</status> <summary>Agent "Explore test and card patterns" failed: classifyHandoffIfNeeded is not defined</summary> </task-notification> Full transcript available at: /tmp/claude-1000/-mnt-dest-btrfs-home-jc-src-mage/tasks/a3064fb.output

The background agent failed but I had already gathered all the information I needed from it and other sources. The CLAUDE.md file has been created successfully at the repository root.