feat: add Hermes Agent support

docs/supported-tools.md

@@ -38,6 +38,7 @@ You can enable expanded workflows (`new`, `continue`, `ff`, `verify`, `bulk-arch
 | Factory Droid (`factory`) | `.factory/skills/openspec-*/SKILL.md` | `.factory/commands/opsx-<id>.md` |
 | Gemini CLI (`gemini`) | `.gemini/skills/openspec-*/SKILL.md` | `.gemini/commands/opsx/<id>.toml` |
 | GitHub Copilot (`github-copilot`) | `.github/skills/openspec-*/SKILL.md` | `.github/prompts/opsx-<id>.prompt.md`\*\* |
+| Hermes Agent (`hermes`) | `.hermes/skills/openspec-*/SKILL.md`\*\*\* | Not generated (no command adapter; use skill-based `/openspec-*` invocations) |
 | iFlow (`iflow`) | `.iflow/skills/openspec-*/SKILL.md` | `.iflow/commands/opsx-<id>.md` |
 | Junie (`junie`) | `.junie/skills/openspec-*/SKILL.md` | `.junie/commands/opsx-<id>.md` |
 | Kilo Code (`kilocode`) | `.kilocode/skills/openspec-*/SKILL.md` | `.kilocode/workflows/opsx-<id>.md` |
@@ -58,6 +59,8 @@ You can enable expanded workflows (`new`, `continue`, `ff`, `verify`, `bulk-arch
 
 \*\* GitHub Copilot prompt files are recognized as custom slash commands in IDE extensions (VS Code, JetBrains, Visual Studio). Copilot CLI does not currently consume `.github/prompts/*.prompt.md` directly.
 
+\*\*\* Hermes loads skills from `~/.hermes/skills/` by default. To use project-local OpenSpec skills, add the project `.hermes/skills/` directory to `skills.external_dirs` in `~/.hermes/config.yaml`; Hermes then exposes skills with user-facing slash invocations such as `/openspec-propose`.
+
 ## Non-Interactive Setup
 
 For CI/CD or scripted setup, use `--tools` (and optionally `--profile`):
@@ -76,7 +79,7 @@ openspec init --tools none
 openspec init --profile core
 ```
 
-**Available tool IDs (`--tools`):** `amazon-q`, `antigravity`, `auggie`, `bob`, `claude`, `cline`, `codex`, `forgecode`, `codebuddy`, `continue`, `costrict`, `crush`, `cursor`, `factory`, `gemini`, `github-copilot`, `iflow`, `junie`, `kilocode`, `kimi`, `kiro`, `lingma`, `vibe`, `oh-my-pi`, `opencode`, `pi`, `qoder`, `qwen`, `roocode`, `trae`, `windsurf`
+**Available tool IDs (`--tools`):** `amazon-q`, `antigravity`, `auggie`, `bob`, `claude`, `cline`, `codex`, `forgecode`, `codebuddy`, `continue`, `costrict`, `crush`, `cursor`, `factory`, `gemini`, `github-copilot`, `hermes`, `iflow`, `junie`, `kilocode`, `kimi`, `kiro`, `lingma`, `vibe`, `oh-my-pi`, `opencode`, `pi`, `qoder`, `qwen`, `roocode`, `trae`, `windsurf`
 
 ## Workflow-Dependent Installation
 

openspec/specs/ai-tool-paths/spec.md

@@ -42,6 +42,13 @@ The `AI_TOOLS` array SHALL include `skillsDir` for tools that support the Agent
 - **WHEN** looking up the `kimi` tool
 - **THEN** `skillsDir` SHALL be `.kimi`
 
+#### Scenario: Hermes Agent paths defined
+
+- **WHEN** looking up the `hermes` tool
+- **THEN** `skillsDir` SHALL be `.hermes`
+- **AND** `setupNote` SHALL explain that project `.hermes/skills` must be added to `skills.external_dirs` in `~/.hermes/config.yaml`
+- **AND** `openspec init` and `openspec update` SHALL display the note whenever `hermes` is configured
+
 #### Scenario: Tools without skillsDir
 
 - **WHEN** a tool has no `skillsDir` defined

src/core/config.ts

@@ -16,6 +16,7 @@ export interface AIToolOption {
   successLabel?: string;
   skillsDir?: string; // e.g., '.claude' - /skills suffix per Agent Skills spec
   detectionPaths?: string[]; // Override skillsDir for auto-detection; any path existing triggers detection
+  setupNote?: string; // Manual setup required before the tool picks up generated files; shown after init/update
 }
 
 export const AI_TOOLS: AIToolOption[] = [
@@ -35,6 +36,7 @@ export const AI_TOOLS: AIToolOption[] = [
   { 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: '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: 'Hermes Agent', value: 'hermes', available: true, successLabel: 'Hermes Agent', skillsDir: '.hermes', detectionPaths: ['.hermes', 'HERMES.md', '.hermes.md'], setupNote: "Hermes only loads skills from ~/.hermes/skills by default. Add this project's .hermes/skills directory to skills.external_dirs in ~/.hermes/config.yaml so Hermes picks up the generated OpenSpec skills." },
   { name: 'iFlow', value: 'iflow', available: true, successLabel: 'iFlow', skillsDir: '.iflow' },
   { name: 'Junie', value: 'junie', available: true, successLabel: 'Junie', skillsDir: '.junie' },
   { name: 'Kilo Code', value: 'kilocode', available: true, successLabel: 'Kilo Code', skillsDir: '.kilocode' },

src/core/init.ts

@@ -709,6 +709,14 @@ export class InitCommand {
       console.log(chalk.dim(`Removed: ${results.removedSkillCount} skill directories (delivery: commands)`));
     }
 
+    // Show manual setup notes for tools that need extra configuration
+    for (const tool of successfulTools) {
+      const setupNote = AI_TOOLS.find((t) => t.value === tool.value)?.setupNote;
+      if (setupNote) {
+        console.log(chalk.yellow(`Setup required for ${tool.name}: ${setupNote}`));
+      }
+    }
+
     // Config status
     if (configStatus === 'created') {
       console.log(`Config: openspec/config.yaml (schema: ${DEFAULT_SCHEMA})`);

src/core/update.ts

@@ -157,6 +157,7 @@ export class UpdateCommand {
       this.detectNewTools(resolvedProjectPath, configuredTools);
       this.displayExtraWorkflowsNote(resolvedProjectPath, configuredTools, desiredWorkflows);
       this.displayOldCoreCustomProfileNote(profile, globalConfig.workflows);
+      this.displaySetupNotes(configuredTools);
       return;
     }
 
@@ -285,6 +286,7 @@ export class UpdateCommand {
     // 14. Display note about extra workflows not in profile
     this.displayExtraWorkflowsNote(resolvedProjectPath, configuredAndNewTools, desiredWorkflows);
     this.displayOldCoreCustomProfileNote(profile, globalConfig.workflows);
+    this.displaySetupNotes(configuredAndNewTools);
 
     // 15. List affected tools
     if (updatedTools.length > 0) {
@@ -332,6 +334,19 @@ export class UpdateCommand {
     }
   }
 
+  /**
+   * Shows manual setup notes for configured tools that need extra
+   * configuration before they pick up generated files.
+   */
+  private displaySetupNotes(toolIds: string[]): void {
+    for (const toolId of toolIds) {
+      const tool = AI_TOOLS.find((t) => t.value === toolId);
+      if (tool?.setupNote) {
+        console.log(chalk.yellow(`Setup required for ${tool.name}: ${tool.setupNote}`));
+      }
+    }
+  }
+
   /**
    * Detects new tool directories that aren't currently configured and displays a hint.
    */

test/core/available-tools.test.ts

@@ -140,6 +140,42 @@ describe('available-tools', () => {
       expect(toolValues).toContain('github-copilot');
     });
 
+    it('should detect Hermes Agent when HERMES.md exists', async () => {
+      await fs.writeFile(path.join(testDir, 'HERMES.md'), '');
+
+      const tools = getAvailableTools(testDir);
+      const hermesTool = tools.find((t) => t.value === 'hermes');
+
+      expect(hermesTool).toMatchObject({
+        name: 'Hermes Agent',
+        skillsDir: '.hermes',
+      });
+    });
+
+    it('should detect Hermes Agent when .hermes.md exists', async () => {
+      await fs.writeFile(path.join(testDir, '.hermes.md'), '');
+
+      const tools = getAvailableTools(testDir);
+      const toolValues = tools.map((t) => t.value);
+      expect(toolValues).toContain('hermes');
+    });
+
+    it('should detect Hermes Agent when .hermes directory exists', async () => {
+      await fs.mkdir(path.join(testDir, '.hermes'), { recursive: true });
+
+      const tools = getAvailableTools(testDir);
+      const toolValues = tools.map((t) => t.value);
+      expect(toolValues).toContain('hermes');
+    });
+
+    it('should not detect Hermes Agent from plain CONTEXT.md', async () => {
+      await fs.writeFile(path.join(testDir, 'CONTEXT.md'), '');
+
+      const tools = getAvailableTools(testDir);
+      const toolValues = tools.map((t) => t.value);
+      expect(toolValues).not.toContain('hermes');
+    });
+
     it('should still use skillsDir detection for tools without detectionPaths', async () => {
       // Claude Code has no detectionPaths, so .claude/ directory should still work
       await fs.mkdir(path.join(testDir, '.claude'), { recursive: true });

test/core/command-generation/registry.test.ts

@@ -32,6 +32,11 @@ describe('command-generation/registry', () => {
       expect(adapter).toBeUndefined();
     });
 
+    it('should return undefined for skills-only tools without adapters', () => {
+      expect(CommandAdapterRegistry.get('hermes')).toBeUndefined();
+      expect(CommandAdapterRegistry.get('kimi')).toBeUndefined();
+    });
+
     it('should return undefined for empty string', () => {
       const adapter = CommandAdapterRegistry.get('');
       expect(adapter).toBeUndefined();

test/core/init.test.ts

@@ -194,6 +194,35 @@ describe('InitCommand', () => {
       ).toBe(true);
     });
 
+    it('should support Hermes Agent as an adapterless skills-only tool with a setup note', async () => {
+      saveGlobalConfig({
+        featureFlags: {},
+        profile: 'core',
+        delivery: 'both',
+      });
+
+      const initCommand = new InitCommand({ tools: 'hermes', force: true });
+      await initCommand.execute(testDir);
+
+      const skillFile = path.join(testDir, '.hermes', 'skills', 'openspec-explore', 'SKILL.md');
+      expect(await fileExists(skillFile)).toBe(true);
+
+      const commandsDir = path.join(testDir, '.hermes', 'commands');
+      expect(await directoryExists(commandsDir)).toBe(false);
+
+      const logCalls = (console.log as unknown as { mock: { calls: unknown[][] } }).mock.calls.flat().map(String);
+      expect(
+        logCalls.some(
+          (entry) => entry.includes('Commands skipped for: hermes') && entry.includes('(no adapter)'),
+        ),
+      ).toBe(true);
+      expect(
+        logCalls.some(
+          (entry) => entry.includes('Setup required for Hermes Agent') && entry.includes('skills.external_dirs'),
+        ),
+      ).toBe(true);
+    });
+
     it('should create both skills and commands for Trae with adapter', async () => {
       saveGlobalConfig({
         configuredTools: [],

test/core/update.test.ts

@@ -140,6 +140,47 @@ Old instructions content
       consoleSpy.mockRestore();
     });
 
+    it('should show the Hermes setup note when updating a configured Hermes tool', async () => {
+      const exploreSkillDir = path.join(testDir, '.hermes', 'skills', 'openspec-explore');
+      await fs.mkdir(exploreSkillDir, { recursive: true });
+      await fs.writeFile(
+        path.join(exploreSkillDir, 'SKILL.md'),
+        `---\nname: openspec-explore\nmetadata:\n  author: openspec\n  version: "0.9"\n---\n\nOld instructions content\n`
+      );
+
+      const consoleSpy = vi.spyOn(console, 'log');
+
+      await updateCommand.execute(testDir);
+
+      const logCalls = consoleSpy.mock.calls.flat().map(String);
+      expect(
+        logCalls.some(
+          (entry) => entry.includes('Setup required for Hermes Agent') && entry.includes('skills.external_dirs'),
+        ),
+      ).toBe(true);
+
+      consoleSpy.mockRestore();
+    });
+
+    it('should show the Hermes setup note even when Hermes is already up to date', async () => {
+      const initCommand = new InitCommand({ tools: 'hermes', force: true });
+      await initCommand.execute(testDir);
+
+      const consoleSpy = vi.spyOn(console, 'log');
+
+      await updateCommand.execute(testDir);
+
+      const logCalls = consoleSpy.mock.calls.flat().map(String);
+      expect(logCalls.some((entry) => entry.includes('up to date'))).toBe(true);
+      expect(
+        logCalls.some(
+          (entry) => entry.includes('Setup required for Hermes Agent') && entry.includes('skills.external_dirs'),
+        ),
+      ).toBe(true);
+
+      consoleSpy.mockRestore();
+    });
+
     it('should update core profile skill files when tool is configured', async () => {
       // Set up a configured tool with one skill directory
       const skillsDir = path.join(testDir, '.claude', 'skills');