diff --git a/CHANGELOG.md b/CHANGELOG.md
index b25ad73..e47f72a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ All notable changes to `@switchbot/openapi-cli` are documented in this file.
 The format is loosely based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 This project follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.6.2] - 2026-04-21
+
+### Fixed
+
+- `scenes execute --dry-run` now outputs structured result on stdout instead of silently exiting (#54)
+- MCP `send_command` dry-run validates command name against catalog before returning success (#55)
+- MCP `run_scene` dry-run validates sceneId against scene list before returning success (#56)
+
 ## [2.6.1] - 2026-04-21
 
 Follow-up to v2.6.0 from the OpenClaw re-audit. Three real findings
diff --git a/package.json b/package.json
index cef6d6c..ec45889 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@switchbot/openapi-cli",
-  "version": "2.6.1",
+  "version": "2.6.2",
   "description": "SwitchBot smart home CLI — control devices, run scenes, stream real-time events, and integrate AI agents via MCP. Full API v1.1 coverage.",
   "keywords": [
     "switchbot",
diff --git a/src/commands/mcp.ts b/src/commands/mcp.ts
index c347ce7..3028c14 100644
--- a/src/commands/mcp.ts
+++ b/src/commands/mcp.ts
@@ -380,6 +380,13 @@ API docs: https://github.com/OpenWonderLabs/SwitchBotAPI`,
             effectiveParameter = pv.normalized;
           }
         }
+        const cmdVal = validateCommand(deviceId, command, stringifiedParam, effectiveType);
+        if (!cmdVal.ok) {
+          return mcpError('usage', 2, cmdVal.error.message, {
+            hint: cmdVal.error.hint,
+            context: { validationKind: cmdVal.error.kind },
+          });
+        }
         const wouldSend = {
           deviceId,
           command,
@@ -529,7 +536,21 @@ API docs: https://github.com/OpenWonderLabs/SwitchBotAPI`,
     },
     async ({ sceneId, dryRun }) => {
       if (dryRun) {
-        const wouldSend = { sceneId };
+        let scenes: Array<{ sceneId: string; sceneName: string }> = [];
+        try {
+          scenes = await fetchScenes();
+        } catch {
+          // network failure — degrade gracefully, skip validation
+        }
+        const found = scenes.find((s) => s.sceneId === sceneId);
+        if (scenes.length > 0 && !found) {
+          return mcpError('usage', 2, `Scene not found: ${sceneId}`, {
+            subKind: 'scene-not-found',
+            hint: "Check the sceneId with 'list_scenes' (IDs are case-sensitive).",
+            context: { sceneId, candidates: scenes.map((s) => ({ sceneId: s.sceneId, sceneName: s.sceneName })).slice(0, 5) },
+          });
+        }
+        const wouldSend = { sceneId, sceneName: found?.sceneName ?? null };
         const structured = { ok: true as const, dryRun: true as const, wouldSend };
         return {
           content: [{ type: 'text', text: JSON.stringify(structured, null, 2) }],
diff --git a/src/commands/scenes.ts b/src/commands/scenes.ts
index fc1859f..81d8e95 100644
--- a/src/commands/scenes.ts
+++ b/src/commands/scenes.ts
@@ -2,6 +2,7 @@ import { Command } from 'commander';
 import { printJson, isJsonMode, handleError, StructuredUsageError } from '../utils/output.js';
 import { resolveFormat, resolveFields, renderRows } from '../utils/format.js';
 import { fetchScenes, executeScene } from '../lib/scenes.js';
+import { isDryRun } from '../utils/flags.js';
 
 export function registerScenesCommand(program: Command): void {
   const scenes = program
@@ -67,6 +68,15 @@ Example:
             candidates: sceneList.map((s) => ({ sceneId: s.sceneId, sceneName: s.sceneName })),
           });
         }
+        if (isDryRun()) {
+          const wouldSend = { method: 'POST', url: `/v1.1/scenes/${sceneId}/execute`, sceneId, sceneName: found.sceneName };
+          if (isJsonMode()) {
+            printJson({ dryRun: true, wouldSend });
+          } else {
+            console.log(`[dry-run] Would POST /v1.1/scenes/${sceneId}/execute (${found.sceneName})`);
+          }
+          return;
+        }
         await executeScene(sceneId);
         if (isJsonMode()) {
           printJson({ ok: true, sceneId });
diff --git a/src/utils/output.ts b/src/utils/output.ts
index 5db48d2..9f57aec 100644
--- a/src/utils/output.ts
+++ b/src/utils/output.ts
@@ -158,6 +158,7 @@ export class UsageError extends Error {
 export type ErrorSubKind =
   | 'device-offline'
   | 'device-not-found'
+  | 'scene-not-found'
   | 'command-not-supported'
   | 'auth-failed'
   | 'quota-exceeded'
diff --git a/tests/commands/dry-run.test.ts b/tests/commands/dry-run.test.ts
index 1feb8ca..d8d017e 100644
--- a/tests/commands/dry-run.test.ts
+++ b/tests/commands/dry-run.test.ts
@@ -146,6 +146,38 @@ describe('dryRun support on mutating tools', () => {
     expect(apiMock.__instance.post).toHaveBeenCalledTimes(1);
   });
 
+  // ---- send_command command-name validation in dry-run (bug #55) --------------
+
+  it('send_command dryRun:true rejects unknown command name (bug #55)', async () => {
+    cacheMock.map.set('BULB3', { type: 'Color Bulb', name: 'Desk Lamp', category: 'physical' });
+    const { client } = await pair();
+
+    const res = await client.callTool({
+      name: 'send_command',
+      arguments: { deviceId: 'BULB3', command: 'fakeCmd', dryRun: true },
+    });
+
+    expect(res.isError).toBe(true);
+    const parsed = JSON.parse((res.content as Array<{ text: string }>)[0].text);
+    expect(parsed.error.context?.validationKind).toBe('unknown-command');
+    expect(apiMock.__instance.post).not.toHaveBeenCalled();
+  });
+
+  it('send_command dryRun:true accepts case-normalized command name (bug #55)', async () => {
+    cacheMock.map.set('BULB4', { type: 'Color Bulb', name: 'Ceiling', category: 'physical' });
+    const { client } = await pair();
+
+    const res = await client.callTool({
+      name: 'send_command',
+      arguments: { deviceId: 'BULB4', command: 'turnon', dryRun: true },
+    });
+
+    expect(res.isError).toBeFalsy();
+    const parsed = JSON.parse((res.content as Array<{ text: string }>)[0].text);
+    expect(parsed.dryRun).toBe(true);
+    expect(apiMock.__instance.post).not.toHaveBeenCalled();
+  });
+
   // ---- run_scene ------------------------------------------------------------
 
   it('run_scene dryRun:true returns wouldSend without calling the API', async () => {
@@ -177,4 +209,43 @@ describe('dryRun support on mutating tools', () => {
     expect(res.isError).toBeFalsy();
     expect(apiMock.__instance.post).toHaveBeenCalledWith('/v1.1/scenes/S123/execute');
   });
+
+  // ---- run_scene sceneId validation in dry-run (bug #56) --------------------
+
+  it('run_scene dryRun:true rejects unknown sceneId (bug #56)', async () => {
+    apiMock.__instance.get.mockResolvedValueOnce({
+      data: { body: [{ sceneId: 'S1', sceneName: 'Good Morning' }] },
+    });
+    const { client } = await pair();
+
+    const res = await client.callTool({
+      name: 'run_scene',
+      arguments: { sceneId: 'FAKE', dryRun: true },
+    });
+
+    expect(res.isError).toBe(true);
+    const parsed = JSON.parse((res.content as Array<{ text: string }>)[0].text);
+    expect(parsed.error.subKind).toBe('scene-not-found');
+    expect(parsed.error.message).toContain('FAKE');
+    expect(apiMock.__instance.post).not.toHaveBeenCalled();
+  });
+
+  it('run_scene dryRun:true returns sceneName in wouldSend for valid sceneId (bug #56)', async () => {
+    apiMock.__instance.get.mockResolvedValueOnce({
+      data: { body: [{ sceneId: 'S1', sceneName: 'Good Morning' }] },
+    });
+    const { client } = await pair();
+
+    const res = await client.callTool({
+      name: 'run_scene',
+      arguments: { sceneId: 'S1', dryRun: true },
+    });
+
+    expect(res.isError).toBeFalsy();
+    const parsed = JSON.parse((res.content as Array<{ text: string }>)[0].text);
+    expect(parsed.dryRun).toBe(true);
+    expect(parsed.wouldSend.sceneId).toBe('S1');
+    expect(parsed.wouldSend.sceneName).toBe('Good Morning');
+    expect(apiMock.__instance.post).not.toHaveBeenCalled();
+  });
 });
diff --git a/tests/commands/scenes.test.ts b/tests/commands/scenes.test.ts
index 22dc0fc..ded14ef 100644
--- a/tests/commands/scenes.test.ts
+++ b/tests/commands/scenes.test.ts
@@ -148,6 +148,44 @@ describe('scenes command', () => {
       expect(parsed.error?.context?.error).toBe('scene_not_found');
       expect(parsed.error?.context?.sceneId).toBe('BOGUS-ID');
     });
+
+    it('--dry-run --json returns structured wouldSend on stdout (bug #54)', async () => {
+      apiMock.__instance.get.mockResolvedValue({
+        data: { body: [{ sceneId: 'SCENE-1', sceneName: 'Morning' }] },
+      });
+      const res = await runCli(registerScenesCommand, ['scenes', 'execute', 'SCENE-1', '--dry-run', '--json']);
+      expect(res.exitCode).toBeNull();
+      expect(apiMock.__instance.post).not.toHaveBeenCalled();
+      const out = res.stdout.join('\n');
+      const parsed = JSON.parse(out);
+      expect(parsed.data.dryRun).toBe(true);
+      expect(parsed.data.wouldSend.sceneId).toBe('SCENE-1');
+      expect(parsed.data.wouldSend.sceneName).toBe('Morning');
+    });
+
+    it('--dry-run plaintext prints Would POST on stdout (bug #54)', async () => {
+      apiMock.__instance.get.mockResolvedValue({
+        data: { body: [{ sceneId: 'SCENE-1', sceneName: 'Morning' }] },
+      });
+      const res = await runCli(registerScenesCommand, ['scenes', 'execute', 'SCENE-1', '--dry-run']);
+      expect(res.exitCode).toBeNull();
+      expect(apiMock.__instance.post).not.toHaveBeenCalled();
+      const out = res.stdout.join('\n');
+      expect(out).toContain('[dry-run]');
+      expect(out).toContain('SCENE-1');
+    });
+
+    it('--dry-run with bogus sceneId still exits 2 with scene_not_found (bug #54)', async () => {
+      apiMock.__instance.get.mockResolvedValue({
+        data: { body: [{ sceneId: 'S1', sceneName: 'Good Morning' }] },
+      });
+      const res = await runCli(registerScenesCommand, ['scenes', 'execute', 'BOGUS', '--dry-run', '--json']);
+      expect(res.exitCode).toBe(2);
+      expect(apiMock.__instance.post).not.toHaveBeenCalled();
+      const out = res.stdout.join('\n');
+      const parsed = JSON.parse(out);
+      expect(parsed.error?.context?.error).toBe('scene_not_found');
+    });
   });
 
   describe('describe', () => {