refactor: update usage pattern for tic tac toe and boop

package-lock.json

@@ -1656,7 +1656,7 @@
     },
     "node_modules/inline-schema": {
       "version": "1.0.0",
-      "resolved": "git+https://gitea.ayi-games.online/hypercross/inline-schema#cf55295ce79a2dcf3114e2910cc6a28ce872be90",
+      "resolved": "git+https://gitea.ayi-games.online/hypercross/inline-schema#16d88d610827b5df7f77d7bc22f66b0a8a802dd7",
       "license": "ISC",
       "dependencies": {
         "csv-parse": "^5.5.6"

src/samples/boop/index.ts

@@ -17,6 +17,7 @@ type PlayerSupply = {
     cat: PieceSupply;
 };
 
+// TODO refactor this into an Entity
 function createPlayerSupply(): PlayerSupply {
     return {
         kitten: { supply: MAX_PIECES_PER_PLAYER, placed: 0 },
@@ -67,21 +68,32 @@ registration.add('setup', async function() {
 
 registration.add('turn <player>', async function(cmd) {
     const [turnPlayer] = cmd.params as [PlayerType];
-    const maxRetries = 50;
-    let retries = 0;
 
-    while (retries < maxRetries) {
-        retries++;
-        const playCmd = await this.prompt('play <player> <row:number> <col:number> [type:string]');
-        const [player, row, col, type] = playCmd.params as [PlayerType, number, number, PieceType?];
+    const playCmd = await this.prompt(
+        'play <player> <row:number> <col:number> [type:string]',
+        (command) => {
+            const [player, row, col, type] = command.params as [PlayerType, number, number, PieceType?];
             const pieceType = type === 'cat' ? 'cat' : 'kitten';
 
-        if (player !== turnPlayer) continue;
-        if (!isValidMove(row, col)) continue;
-        if (isCellOccupied(this.context, row, col)) continue;
+            if (player !== turnPlayer) {
+                return `Invalid player: ${player}. Expected ${turnPlayer}.`;
+            }
+            if (!isValidMove(row, col)) {
+                return `Invalid position: (${row}, ${col}). Must be between 0 and ${BOARD_SIZE - 1}.`;
+            }
+            if (isCellOccupied(this.context, row, col)) {
+                return `Cell (${row}, ${col}) is already occupied.`;
+            }
 
             const supply = this.context.value.players[player][pieceType].supply;
-        if (supply <= 0) continue;
+            if (supply <= 0) {
+                return `No ${pieceType}s left in ${player}'s supply.`;
+            }
+            return null;
+        }
+    );
+    const [player, row, col, type] = playCmd.params as [PlayerType, number, number, PieceType?];
+    const pieceType = type === 'cat' ? 'cat' : 'kitten';
 
     placePiece(this.context, row, col, turnPlayer, pieceType);
     applyBoops(this.context, row, col, pieceType);
@@ -95,9 +107,6 @@ registration.add('turn <player>', async function(cmd) {
     if (winner) return { winner };
 
     return { winner: null };
-    }
-
-    throw new Error('Too many invalid attempts');
 });
 
 function isValidMove(row: number, col: number): boolean {

src/samples/tic-tac-toe.ts

@@ -61,18 +61,26 @@ registration.add('setup', async function() {
 
 registration.add('turn <player> <turn:number>', async function(cmd) {
     const [turnPlayer, turnNumber] = cmd.params as [PlayerType, number];
-    const maxRetries = MAX_TURNS * 2;
-    let retries = 0;
 
-    while (retries < maxRetries) {
-        retries++;
-        const playCmd = await this.prompt('play <player> <row:number> <col:number>');
+    const playCmd = await this.prompt(
+        'play <player> <row:number> <col:number>',
+        (command) => {
+            const [player, row, col] = command.params as [PlayerType, number, number];
+
+            if (player !== turnPlayer) {
+                return `Invalid player: ${player}. Expected ${turnPlayer}.`;
+            }
+            if (!isValidMove(row, col)) {
+                return `Invalid position: (${row}, ${col}). Must be between 0 and ${BOARD_SIZE - 1}.`;
+            }
+            if (isCellOccupied(this.context, row, col)) {
+                return `Cell (${row}, ${col}) is already occupied.`;
+            }
+            return null;
+        }
+    );
     const [player, row, col] = playCmd.params as [PlayerType, number, number];
 
-        if (player !== turnPlayer) continue;
-        if (!isValidMove(row, col)) continue;
-        if (isCellOccupied(this.context, row, col)) continue;
-
     placePiece(this.context, row, col, turnPlayer);
 
     const winner = checkWinner(this.context);
@@ -80,9 +88,6 @@ registration.add('turn <player> <turn:number>', async function(cmd) {
     if (turnNumber >= MAX_TURNS) return { winner: 'draw' as WinnerType };
 
     return { winner: null };
-    }
-
-    throw new Error('Too many invalid attempts');
 });
 
 function isValidMove(row: number, col: number): boolean {

src/utils/command/command-registry.ts

@@ -45,8 +45,8 @@ export type CommandRunnerContextExport<TContext> = CommandRunnerContext<TContext
     registry: CommandRegistry<TContext>;
     promptQueue: AsyncQueue<PromptEvent>;
     _activePrompt: PromptEvent | null;
-    _resolvePrompt: (command: Command) => void;
-    _rejectPrompt: (error: Error) => void;
+    _tryCommit: (command: Command) => string | null;
+    _cancel: (reason?: string) => void;
     _pendingInput: string | null;
 };
 
@@ -66,25 +66,41 @@ export function createCommandRunnerContext<TContext>(
 
     let activePrompt: PromptEvent | null = null;
 
-    const resolvePrompt = (command: Command) => {
+    const tryCommit = (command: Command) => {
         if (activePrompt) {
-            activePrompt.resolve(command);
+            const result = activePrompt.tryCommit(command);
+            if (result === null) {
+                activePrompt = null;
+            }
+            return result;
+        }
+        return 'No active prompt';
+    };
+
+    const cancel = (reason?: string) => {
+        if (activePrompt) {
+            activePrompt.cancel(reason);
             activePrompt = null;
         }
     };
 
-    const rejectPrompt = (error: Error) => {
-        if (activePrompt) {
-            activePrompt.reject(error);
-            activePrompt = null;
-        }
-    };
-
-    const prompt = (schema: Parameters<CommandRunnerContext<TContext>['prompt']>[0]): Promise<Command> => {
+    const prompt = (
+        schema: CommandSchema | string,
+        validator?: (command: Command) => string | null
+    ): Promise<Command> => {
         const resolvedSchema = typeof schema === 'string' ? parseCommandSchema(schema) : schema;
         return new Promise((resolve, reject) => {
-            activePrompt = { schema: resolvedSchema, resolve, reject };
-            const event: PromptEvent = { schema: resolvedSchema, resolve, reject };
+            const tryCommit = (command: Command) => {
+                const error = validator?.(command);
+                if (error) return error;
+                resolve(command);
+                return null;
+            };
+            const cancel = (reason?: string) => {
+                reject(new Error(reason ?? 'Cancelled'));
+            };
+            activePrompt = { schema: resolvedSchema, tryCommit, cancel };
+            const event: PromptEvent = { schema: resolvedSchema, tryCommit, cancel };
             for (const listener of listeners) {
                 listener(event);
             }
@@ -100,8 +116,8 @@ export function createCommandRunnerContext<TContext>(
         on,
         off,
         _activePrompt: null,
-        _resolvePrompt: resolvePrompt,
-        _rejectPrompt: rejectPrompt,
+        _tryCommit: tryCommit,
+        _cancel: cancel,
         _pendingInput: null,
         promptQueue: null!
     };

src/utils/command/command-runner.ts

@@ -2,8 +2,14 @@ import type { Command, CommandSchema } from './types';
 
 export type PromptEvent = {
     schema: CommandSchema;
-    resolve: (command: Command) => void;
-    reject: (error: Error) => void;
+    /** 
+     * 尝试提交命令
+     * @returns null - 验证成功，Promise 已 resolve
+     * @returns string - 验证失败，返回错误消息，Promise 未 resolve
+     */
+    tryCommit: (command: Command) => string | null;
+    /** 取消 prompt，Promise 被 reject */
+    cancel: (reason?: string) => void;
 };
 
 export type CommandRunnerEvents = {
@@ -22,7 +28,7 @@ export type CommandRunnerContext<TContext> = {
     context: TContext;
     run: <T=unknown>(input: string) => Promise<CommandResult<T>>;
     runParsed: (command: Command) => Promise<{ success: true; result: unknown } | { success: false; error: string }>;
-    prompt: (schema: CommandSchema | string) => Promise<Command>;
+    prompt: (schema: CommandSchema | string, validator?: (command: Command) => string | null) => Promise<Command>;
     on: <T extends keyof CommandRunnerEvents>(event: T, listener: (e: CommandRunnerEvents[T]) => void) => void;
     off: <T extends keyof CommandRunnerEvents>(event: T, listener: (e: CommandRunnerEvents[T]) => void) => void;
 };

tests/core/game.test.ts

@@ -64,7 +64,8 @@ describe('createGameContext', () => {
         expect(promptEvent).not.toBeNull();
         expect(promptEvent.schema.name).toBe('prompt');
 
-        promptEvent.resolve({ name: 'prompt', params: ['yes'], options: {}, flags: {} });
+        const error = promptEvent.tryCommit({ name: 'prompt', params: ['yes'], options: {}, flags: {} });
+        expect(error).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);

tests/samples/boop.test.ts

@@ -464,7 +464,7 @@ describe('Boop - game flow', () => {
         expect(promptEvent).not.toBeNull();
         expect(promptEvent.schema.name).toBe('play');
 
-        promptEvent.reject(new Error('test end'));
+        promptEvent.cancel('test end');
 
         const result = await runPromise;
         expect(result.success).toBe(false);
@@ -480,7 +480,8 @@ describe('Boop - game flow', () => {
         expect(promptEvent).not.toBeNull();
         expect(promptEvent.schema.name).toBe('play');
 
-        promptEvent.resolve({ name: 'play', params: ['white', 2, 2], options: {}, flags: {} });
+        const error = promptEvent.tryCommit({ name: 'play', params: ['white', 2, 2], options: {}, flags: {} });
+        expect(error).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -497,12 +498,13 @@ describe('Boop - game flow', () => {
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn white');
 
         const promptEvent1 = await promptPromise;
-        promptEvent1.resolve({ name: 'play', params: ['black', 2, 2], options: {}, flags: {} });
+        // 验证器会拒绝错误的玩家
+        const error1 = promptEvent1.tryCommit({ name: 'play', params: ['black', 2, 2], options: {}, flags: {} });
+        expect(error1).toContain('Invalid player');
 
-        const promptEvent2 = await waitForPrompt(ctx);
-        expect(promptEvent2).not.toBeNull();
-
-        promptEvent2.resolve({ name: 'play', params: ['white', 2, 2], options: {}, flags: {} });
+        // 验证失败后，再次尝试有效输入
+        const error2 = promptEvent1.tryCommit({ name: 'play', params: ['white', 2, 2], options: {}, flags: {} });
+        expect(error2).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -519,12 +521,12 @@ describe('Boop - game flow', () => {
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn white');
 
         const promptEvent1 = await promptPromise;
-        promptEvent1.resolve({ name: 'play', params: ['white', 2, 2], options: {}, flags: {} });
+        const error1 = promptEvent1.tryCommit({ name: 'play', params: ['white', 2, 2], options: {}, flags: {} });
+        expect(error1).toContain('occupied');
 
-        const promptEvent2 = await waitForPrompt(ctx);
-        expect(promptEvent2).not.toBeNull();
-
-        promptEvent2.resolve({ name: 'play', params: ['white', 0, 0], options: {}, flags: {} });
+        // 验证失败后，再次尝试有效输入
+        const error2 = promptEvent1.tryCommit({ name: 'play', params: ['white', 0, 0], options: {}, flags: {} });
+        expect(error2).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -543,12 +545,11 @@ describe('Boop - game flow', () => {
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn white');
 
         const promptEvent1 = await promptPromise;
-        promptEvent1.resolve({ name: 'play', params: ['white', 0, 0], options: {}, flags: {} });
+        const error1 = promptEvent1.tryCommit({ name: 'play', params: ['white', 0, 0], options: {}, flags: {} });
+        expect(error1).toContain('No kittens');
 
-        const promptEvent2 = await waitForPrompt(ctx);
-        expect(promptEvent2).not.toBeNull();
-
-        promptEvent2.reject(new Error('test end'));
+        // 验证失败后，取消
+        promptEvent1.cancel('test end');
 
         const result = await runPromise;
         expect(result.success).toBe(false);
@@ -561,7 +562,8 @@ describe('Boop - game flow', () => {
         let promptPromise = waitForPrompt(ctx);
         let runPromise = ctx.commands.run<{winner: WinnerType}>('turn white');
         let prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['white', 3, 3], options: {}, flags: {} });
+        const error1 = prompt.tryCommit({ name: 'play', params: ['white', 3, 3], options: {}, flags: {} });
+        expect(error1).toBeNull();
         let result = await runPromise;
         expect(result.success).toBe(true);
         expect(getParts(state).length).toBe(1);
@@ -569,7 +571,8 @@ describe('Boop - game flow', () => {
         promptPromise = waitForPrompt(ctx);
         runPromise = ctx.commands.run<{winner: WinnerType}>('turn black');
         prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['black', 2, 2], options: {}, flags: {} });
+        const error2 = prompt.tryCommit({ name: 'play', params: ['black', 2, 2], options: {}, flags: {} });
+        expect(error2).toBeNull();
         result = await runPromise;
         expect(result.success).toBe(true);
         expect(getParts(state).length).toBe(2);
@@ -610,7 +613,8 @@ describe('Boop - game flow', () => {
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn white');
 
         const promptEvent = await promptPromise;
-        promptEvent.resolve({ name: 'play', params: ['white', 2, 2, 'cat'], options: {}, flags: {} });
+        const error = promptEvent.tryCommit({ name: 'play', params: ['white', 2, 2, 'cat'], options: {}, flags: {} });
+        expect(error).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -632,12 +636,11 @@ describe('Boop - game flow', () => {
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn white');
 
         const promptEvent1 = await promptPromise;
-        promptEvent1.resolve({ name: 'play', params: ['white', 0, 0, 'cat'], options: {}, flags: {} });
+        const error1 = promptEvent1.tryCommit({ name: 'play', params: ['white', 0, 0, 'cat'], options: {}, flags: {} });
+        expect(error1).toContain('No cats');
 
-        const promptEvent2 = await waitForPrompt(ctx);
-        expect(promptEvent2).not.toBeNull();
-
-        promptEvent2.reject(new Error('test end'));
+        // 验证失败后，取消
+        promptEvent1.cancel('test end');
 
         const result = await runPromise;
         expect(result.success).toBe(false);

tests/samples/tic-tac-toe.test.ts

@@ -207,7 +207,7 @@ describe('TicTacToe - game flow', () => {
         expect(promptEvent).not.toBeNull();
         expect(promptEvent.schema.name).toBe('play');
 
-        promptEvent.reject(new Error('test end'));
+        promptEvent.cancel('test end');
 
         const result = await runPromise;
         expect(result.success).toBe(false);
@@ -223,7 +223,8 @@ describe('TicTacToe - game flow', () => {
         expect(promptEvent).not.toBeNull();
         expect(promptEvent.schema.name).toBe('play');
 
-        promptEvent.resolve({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        const error = promptEvent.tryCommit({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        expect(error).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -239,12 +240,13 @@ describe('TicTacToe - game flow', () => {
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn X 1');
 
         const promptEvent1 = await promptPromise;
-        promptEvent1.resolve({ name: 'play', params: ['O', 1, 1], options: {}, flags: {} });
+        // 验证器会拒绝错误的玩家
+        const error1 = promptEvent1.tryCommit({ name: 'play', params: ['O', 1, 1], options: {}, flags: {} });
+        expect(error1).toContain('Invalid player');
 
-        const promptEvent2 = await waitForPrompt(ctx);
-        expect(promptEvent2).not.toBeNull();
-
-        promptEvent2.resolve({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        // 验证失败后，再次尝试有效输入
+        const error2 = promptEvent1.tryCommit({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        expect(error2).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -261,12 +263,12 @@ describe('TicTacToe - game flow', () => {
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn X 1');
 
         const promptEvent1 = await promptPromise;
-        promptEvent1.resolve({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        const error1 = promptEvent1.tryCommit({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        expect(error1).toContain('occupied');
 
-        const promptEvent2 = await waitForPrompt(ctx);
-        expect(promptEvent2).not.toBeNull();
-
-        promptEvent2.resolve({ name: 'play', params: ['X', 0, 0], options: {}, flags: {} });
+        // 验证失败后，再次尝试有效输入
+        const error2 = promptEvent1.tryCommit({ name: 'play', params: ['X', 0, 0], options: {}, flags: {} });
+        expect(error2).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -279,7 +281,8 @@ describe('TicTacToe - game flow', () => {
         let promptPromise = waitForPrompt(ctx);
         let runPromise = ctx.commands.run<{winner: WinnerType}>('turn X 1');
         let prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['X', 0, 0], options: {}, flags: {} });
+        const error1 = prompt.tryCommit({ name: 'play', params: ['X', 0, 0], options: {}, flags: {} });
+        expect(error1).toBeNull();
         let result = await runPromise;
         expect(result.success).toBe(true);
         if (result.success) expect(result.result.winner).toBeNull();
@@ -287,7 +290,8 @@ describe('TicTacToe - game flow', () => {
         promptPromise = waitForPrompt(ctx);
         runPromise = ctx.commands.run('turn O 2');
         prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['O', 0, 1], options: {}, flags: {} });
+        const error2 = prompt.tryCommit({ name: 'play', params: ['O', 0, 1], options: {}, flags: {} });
+        expect(error2).toBeNull();
         result = await runPromise;
         expect(result.success).toBe(true);
         if (result.success) expect(result.result.winner).toBeNull();
@@ -295,7 +299,8 @@ describe('TicTacToe - game flow', () => {
         promptPromise = waitForPrompt(ctx);
         runPromise = ctx.commands.run('turn X 3');
         prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['X', 1, 0], options: {}, flags: {} });
+        const error3 = prompt.tryCommit({ name: 'play', params: ['X', 1, 0], options: {}, flags: {} });
+        expect(error3).toBeNull();
         result = await runPromise;
         expect(result.success).toBe(true);
         if (result.success) expect(result.result.winner).toBeNull();
@@ -303,7 +308,8 @@ describe('TicTacToe - game flow', () => {
         promptPromise = waitForPrompt(ctx);
         runPromise = ctx.commands.run('turn O 4');
         prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['O', 0, 2], options: {}, flags: {} });
+        const error4 = prompt.tryCommit({ name: 'play', params: ['O', 0, 2], options: {}, flags: {} });
+        expect(error4).toBeNull();
         result = await runPromise;
         expect(result.success).toBe(true);
         if (result.success) expect(result.result.winner).toBeNull();
@@ -311,7 +317,8 @@ describe('TicTacToe - game flow', () => {
         promptPromise = waitForPrompt(ctx);
         runPromise = ctx.commands.run('turn X 5');
         prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['X', 2, 0], options: {}, flags: {} });
+        const error5 = prompt.tryCommit({ name: 'play', params: ['X', 2, 0], options: {}, flags: {} });
+        expect(error5).toBeNull();
         result = await runPromise;
         expect(result.success).toBe(true);
         if (result.success) expect(result.result.winner).toBe('X');
@@ -341,7 +348,8 @@ describe('TicTacToe - game flow', () => {
         const promptPromise = waitForPrompt(ctx);
         const runPromise = ctx.commands.run<{winner: WinnerType}>('turn X 9');
         const prompt = await promptPromise;
-        prompt.resolve({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        const error = prompt.tryCommit({ name: 'play', params: ['X', 1, 1], options: {}, flags: {} });
+        expect(error).toBeNull();
         const result = await runPromise;
         expect(result.success).toBe(true);
         if (result.success) expect(result.result.winner).toBe('draw');

tests/utils/command-runner.test.ts

@@ -296,7 +296,8 @@ describe('prompt', () => {
         expect(promptEvent).not.toBeNull();
 
         const parsed = { name: 'select', params: ['Ace'], options: {}, flags: {} };
-        promptEvent!.resolve(parsed);
+        const error = promptEvent!.tryCommit(parsed);
+        expect(error).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -336,7 +337,7 @@ describe('prompt', () => {
         await new Promise((r) => setTimeout(r, 0));
         expect(promptEvent).not.toBeNull();
 
-        promptEvent!.reject(new Error('user cancelled'));
+        promptEvent!.cancel('user cancelled');
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -373,7 +374,8 @@ describe('prompt', () => {
         expect(promptEvent).not.toBeNull();
         expect(promptEvent!.schema.name).toBe('pick');
 
-        promptEvent!.resolve({ name: 'pick', params: ['sword'], options: {}, flags: {} });
+        const error = promptEvent!.tryCommit({ name: 'pick', params: ['sword'], options: {}, flags: {} });
+        expect(error).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -410,13 +412,15 @@ describe('prompt', () => {
         expect(promptEvents.length).toBe(1);
         expect(promptEvents[0].schema.name).toBe('first');
 
-        promptEvents[0].resolve({ name: 'first', params: ['one'], options: {}, flags: {} });
+        const error1 = promptEvents[0].tryCommit({ name: 'first', params: ['one'], options: {}, flags: {} });
+        expect(error1).toBeNull();
 
         await new Promise((r) => setTimeout(r, 0));
         expect(promptEvents.length).toBe(2);
         expect(promptEvents[1].schema.name).toBe('second');
 
-        promptEvents[1].resolve({ name: 'second', params: ['two'], options: {}, flags: {} });
+        const error2 = promptEvents[1].tryCommit({ name: 'second', params: ['two'], options: {}, flags: {} });
+        expect(error2).toBeNull();
 
         const result = await runPromise;
         expect(result.success).toBe(true);
@@ -424,4 +428,93 @@ describe('prompt', () => {
             expect(result.result).toEqual(['one', 'two']);
         }
     });
+
+    it('should validate input with validator function', async () => {
+        const registry = createCommandRegistry<TestContext>();
+
+        const chooseRunner: CommandRunner<TestContext, string> = {
+            schema: parseCommandSchema('choose'),
+            run: async function () {
+                const result = await this.prompt(
+                    'select <card>',
+                    (cmd) => {
+                        const card = cmd.params[0] as string;
+                        if (!['Ace', 'King', 'Queen'].includes(card)) {
+                            return `Invalid card: ${card}. Must be Ace, King, or Queen.`;
+                        }
+                        return null;
+                    }
+                );
+                return result.params[0] as string;
+            },
+        };
+
+        registerCommand(registry, chooseRunner);
+
+        const ctx = { counter: 0, log: [] };
+        let promptEvent: PromptEvent | null = null;
+
+        const runnerCtx = createCommandRunnerContext(registry, ctx);
+        runnerCtx.on('prompt', (e) => {
+            promptEvent = e;
+        });
+
+        const runPromise = runnerCtx.run('choose');
+
+        await new Promise((r) => setTimeout(r, 0));
+        expect(promptEvent).not.toBeNull();
+
+        // Try invalid input
+        const invalidError = promptEvent!.tryCommit({ name: 'select', params: ['Jack'], options: {}, flags: {} });
+        expect(invalidError).toContain('Invalid card: Jack');
+
+        // Try valid input
+        const validError = promptEvent!.tryCommit({ name: 'select', params: ['Ace'], options: {}, flags: {} });
+        expect(validError).toBeNull();
+
+        const result = await runPromise;
+        expect(result.success).toBe(true);
+        if (result.success) {
+            expect(result.result).toBe('Ace');
+        }
+    });
+
+    it('should allow cancel with custom reason', async () => {
+        const registry = createCommandRegistry<TestContext>();
+
+        const chooseRunner: CommandRunner<TestContext, string> = {
+            schema: parseCommandSchema('choose'),
+            run: async function () {
+                try {
+                    await this.prompt('select <card>');
+                    return 'unexpected success';
+                } catch (e) {
+                    return (e as Error).message;
+                }
+            },
+        };
+
+        registerCommand(registry, chooseRunner);
+
+        const ctx = { counter: 0, log: [] };
+        let promptEvent: PromptEvent | null = null;
+
+        const runnerCtx = createCommandRunnerContext(registry, ctx);
+        runnerCtx.on('prompt', (e) => {
+            promptEvent = e;
+        });
+
+        const runPromise = runnerCtx.run('choose');
+
+        await new Promise((r) => setTimeout(r, 0));
+        expect(promptEvent).not.toBeNull();
+
+        promptEvent!.cancel('custom cancellation reason');
+
+        const result = await runPromise;
+        expect(result.success).toBe(true);
+        if (result.success) {
+            expect(result.result).toBe('custom cancellation reason');
+        }
+    });
 });