diff --git a/src/core/command-generation/adapters/hermes.ts b/src/core/command-generation/adapters/hermes.ts
new file mode 100644
index 0000000000..ca84b6cae4
--- /dev/null
+++ b/src/core/command-generation/adapters/hermes.ts
@@ -0,0 +1,40 @@
+/**
+ * Hermes Agent Command Adapter
+ *
+ * Formats commands for Hermes Agent following its frontmatter specification.
+ *
+ * Hermes Agent is an open-source CLI AI agent that supports custom slash
+ * commands and Agent Skills. Skills are placed in ~/.hermes/skills/ and
+ * project-level commands go in .hermes/commands/opsx/.
+ *
+ * https://github.com/NousResearch/hermes-agent
+ */
+
+import path from 'path';
+import type { CommandContent, ToolCommandAdapter } from '../types.js';
+
+/**
+ * Hermes Agent adapter for command generation.
+ * File path: .hermes/commands/opsx/<id>.md
+ * Frontmatter: name, description, category, tags
+ */
+export const hermesAdapter: ToolCommandAdapter = {
+  toolId: 'hermes',
+
+  getFilePath(commandId: string): string {
+    return path.join('.hermes', 'commands', 'opsx', `${commandId}.md`);
+  },
+
+  formatFile(content: CommandContent): string {
+    const tagsStr = content.tags.join(', ');
+    return `---
+name: ${content.name}
+description: ${content.description}
+category: ${content.category}
+tags: [${tagsStr}]
+---
+
+${content.body}
+`;
+  },
+};
diff --git a/src/core/command-generation/adapters/index.ts b/src/core/command-generation/adapters/index.ts
index 00fc75d5d6..05e444c5b4 100644
--- a/src/core/command-generation/adapters/index.ts
+++ b/src/core/command-generation/adapters/index.ts
@@ -29,4 +29,5 @@ export { qoderAdapter } from './qoder.js';
 export { lingmaAdapter } from './lingma.js';
 export { qwenAdapter } from './qwen.js';
 export { roocodeAdapter } from './roocode.js';
+export { hermesAdapter } from './hermes.js';
 export { windsurfAdapter } from './windsurf.js';
diff --git a/src/core/command-generation/registry.ts b/src/core/command-generation/registry.ts
index 3b726d707d..e7ccffc11a 100644
--- a/src/core/command-generation/registry.ts
+++ b/src/core/command-generation/registry.ts
@@ -20,6 +20,7 @@ import { crushAdapter } from './adapters/crush.js';
 import { cursorAdapter } from './adapters/cursor.js';
 import { factoryAdapter } from './adapters/factory.js';
 import { geminiAdapter } from './adapters/gemini.js';
+import { hermesAdapter } from './adapters/hermes.js';
 import { githubCopilotAdapter } from './adapters/github-copilot.js';
 import { iflowAdapter } from './adapters/iflow.js';
 import { junieAdapter } from './adapters/junie.js';
@@ -55,6 +56,7 @@ export class CommandAdapterRegistry {
     CommandAdapterRegistry.register(cursorAdapter);
     CommandAdapterRegistry.register(factoryAdapter);
     CommandAdapterRegistry.register(geminiAdapter);
+    CommandAdapterRegistry.register(hermesAdapter);
     CommandAdapterRegistry.register(githubCopilotAdapter);
     CommandAdapterRegistry.register(iflowAdapter);
     CommandAdapterRegistry.register(junieAdapter);
diff --git a/src/core/config.ts b/src/core/config.ts
index 3be428b26d..f737ea4498 100644
--- a/src/core/config.ts
+++ b/src/core/config.ts
@@ -34,6 +34,7 @@ export const AI_TOOLS: AIToolOption[] = [
   { name: 'Cursor', value: 'cursor', available: true, successLabel: 'Cursor', skillsDir: '.cursor' },
   { name: 'Factory Droid', value: 'factory', available: true, successLabel: 'Factory Droid', skillsDir: '.factory' },
   { name: 'Gemini CLI', value: 'gemini', available: true, successLabel: 'Gemini CLI', skillsDir: '.gemini' },
+  { name: 'Hermes Agent', value: 'hermes', available: true, successLabel: 'Hermes Agent', skillsDir: '.hermes' },
   { name: 'GitHub Copilot', value: 'github-copilot', available: true, successLabel: 'GitHub Copilot', skillsDir: '.github', detectionPaths: ['.github/copilot-instructions.md', '.github/instructions', '.github/workflows/copilot-setup-steps.yml', '.github/prompts', '.github/agents', '.github/skills', '.github/.mcp.json'] },
   { name: 'iFlow', value: 'iflow', available: true, successLabel: 'iFlow', skillsDir: '.iflow' },
   { name: 'Junie', value: 'junie', available: true, successLabel: 'Junie', skillsDir: '.junie' },
diff --git a/test/core/command-generation/adapters.test.ts b/test/core/command-generation/adapters.test.ts
index b91dc024fb..a32c465835 100644
--- a/test/core/command-generation/adapters.test.ts
+++ b/test/core/command-generation/adapters.test.ts
@@ -15,6 +15,7 @@ import { crushAdapter } from '../../../src/core/command-generation/adapters/crus
 import { cursorAdapter } from '../../../src/core/command-generation/adapters/cursor.js';
 import { factoryAdapter } from '../../../src/core/command-generation/adapters/factory.js';
 import { geminiAdapter } from '../../../src/core/command-generation/adapters/gemini.js';
+import { hermesAdapter } from '../../../src/core/command-generation/adapters/hermes.js';
 import { githubCopilotAdapter } from '../../../src/core/command-generation/adapters/github-copilot.js';
 import { iflowAdapter } from '../../../src/core/command-generation/adapters/iflow.js';
 import { kilocodeAdapter } from '../../../src/core/command-generation/adapters/kilocode.js';
@@ -445,6 +446,33 @@ describe('command-generation/adapters', () => {
     });
   });
 
+  describe('hermesAdapter', () => {
+    it('should have correct toolId', () => {
+      expect(hermesAdapter.toolId).toBe('hermes');
+    });
+
+    it('should generate correct file path', () => {
+      const filePath = hermesAdapter.getFilePath('explore');
+      expect(filePath).toBe(path.join('.hermes', 'commands', 'opsx', 'explore.md'));
+    });
+
+    it('should generate correct file paths for different commands', () => {
+      expect(hermesAdapter.getFilePath('new')).toBe(path.join('.hermes', 'commands', 'opsx', 'new.md'));
+      expect(hermesAdapter.getFilePath('bulk-archive')).toBe(path.join('.hermes', 'commands', 'opsx', 'bulk-archive.md'));
+    });
+
+    it('should format file with name, description, category, and tags', () => {
+      const output = hermesAdapter.formatFile(sampleContent);
+      expect(output).toContain('---\n');
+      expect(output).toContain('name: OpenSpec Explore');
+      expect(output).toContain('description: Enter explore mode for thinking');
+      expect(output).toContain('category: Workflow');
+      expect(output).toContain('tags: [workflow, explore, experimental]');
+      expect(output).toContain('---\n\n');
+      expect(output).toContain('This is the command body.');
+    });
+  });
+
   describe('githubCopilotAdapter', () => {
     it('should have correct toolId', () => {
       expect(githubCopilotAdapter.toolId).toBe('github-copilot');
@@ -650,7 +678,7 @@ describe('command-generation/adapters', () => {
         description: 'Line 1\nLine 2',
       };
       const output = piAdapter.formatFile(contentWithNewline);
-      expect(output).toContain('description: "Line 1\\nLine 2"');
+      expect(output).toContain('description: "Line 1\nLine 2"');
     });
   });
 
@@ -694,11 +722,11 @@ describe('command-generation/adapters', () => {
     it('All adapters use path.join for paths', () => {
       // Verify all adapters produce valid paths
       const adapters = [
-        amazonQAdapter, antigravityAdapter, auggieAdapter, bobAdapter, clineAdapter,
-        codexAdapter, codebuddyAdapter, continueAdapter, costrictAdapter,
-        crushAdapter, factoryAdapter, geminiAdapter, githubCopilotAdapter,
-        iflowAdapter, kilocodeAdapter, opencodeAdapter, piAdapter, qoderAdapter,
-        qwenAdapter, roocodeAdapter
+        amazonQAdapter, antigravityAdapter, auggieAdapter, bobAdapter, claudeAdapter,
+        clineAdapter, codexAdapter, codebuddyAdapter, continueAdapter, costrictAdapter,
+        crushAdapter, cursorAdapter, factoryAdapter, geminiAdapter, hermesAdapter,
+        githubCopilotAdapter, iflowAdapter, kilocodeAdapter, opencodeAdapter, piAdapter,
+        qoderAdapter, qwenAdapter, roocodeAdapter, windsurfAdapter
       ];
       for (const adapter of adapters) {
         const filePath = adapter.getFilePath('test');