feat: Adds support for OpenCode

README.md

@@ -87,6 +87,7 @@ The CLI auto-detects your IDE from project directory markers. If multiple IDEs a
 | [Codex](https://developers.openai.com/codex/skills/) | `--ide codex` | `.agent/skills/` | Agent Skills |
 | [Cursor](https://cursor.com/docs/skills) | `--ide cursor` | `.cursor/skills/` | Agent Skills |
 | [GitHub Copilot](https://docs.github.com/en/copilot/concepts/agents/about-agent-skills) | `--ide copilot` | `.github/skills/` | Agent Skills |
+| [OpenCode](https://opencode.ai) | `--ide opencode` | `.opencode/skills/` | Agent Skills |
 | Generic | `--ide generic` | `.agent/skills/` | Agent Skills |
 
 Antigravity, Codex, and generic all install to the same `.agent/skills/` directory (only `generic` is stored in the config). GitHub Copilot is not auto-detected (`.github/` is often used for other purposes); use `--ide copilot` to install skills for Copilot explicitly.

lib/src/ide/adapters/opencode_adapter.dart

@@ -0,0 +1,11 @@
+import '../ide.dart';
+import 'agent_skills_adapter.dart';
+
+/// OpenCode adapter.
+///
+/// Installs skills to `.opencode/skills/<skill-name>/` per
+/// [OpenCode skills](https://opencode.ai/docs/skills/).
+class OpenCodeAdapter extends AgentSkillsAdapter {
+  OpenCodeAdapter(String projectPath)
+      : super(Ide.opencode.skillsPath(projectPath));
+}

lib/src/ide/ide.dart

@@ -12,7 +12,8 @@ enum Ide {
   generic('generic', '.agent/skills'),
   claude('claude', '.claude/skills'),
   copilot('copilot', '.github/skills'),
-  cline('cline', '.cline/skills');
+  cline('cline', '.cline/skills'),
+  opencode('opencode', '.opencode/skills');
 
   final String cliName;
 
@@ -44,6 +45,7 @@ enum Ide {
       Ide.cline => Directory(p.join(projectPath, '.cline')).existsSync() ||
           Directory(p.join(projectPath, '.clinerules')).existsSync(),
       Ide.copilot => false,
+      Ide.opencode => Directory(p.join(projectPath, '.opencode')).existsSync(),
     };
   }
 

lib/src/ide/ide_adapter_factory.dart

@@ -3,6 +3,7 @@ import 'adapters/cline_adapter.dart';
 import 'adapters/copilot_adapter.dart';
 import 'adapters/cursor_adapter.dart';
 import 'adapters/generic_adapter.dart';
+import 'adapters/opencode_adapter.dart';
 import 'ide.dart';
 import 'ide_adapter.dart';
 
@@ -14,5 +15,6 @@ IdeAdapter createIdeAdapter(Ide ide, String projectPath) {
     Ide.claude => ClaudeAdapter(projectPath),
     Ide.copilot => CopilotAdapter(projectPath),
     Ide.cline => ClineAdapter(projectPath),
+    Ide.opencode => OpenCodeAdapter(projectPath),
   };
 }

test/ide/ide_detection_test.dart

@@ -47,6 +47,17 @@ void main() {
     });
   });
 
+  group('Given a project with a .opencode directory', () {
+    test('when detecting IDE then returns opencode', () async {
+      await d.dir('opencode_project', [d.dir('.opencode')]).create();
+
+      const detector = IdeDetector();
+      final ide = detector.detect(d.path('opencode_project'));
+
+      expect(ide, equals(Ide.opencode));
+    });
+  });
+
   group('Given a project with .github/copilot-instructions.md', () {
     test('when detecting IDE then does not auto-detect copilot', () async {
       await d.dir('copilot_project', [
@@ -119,6 +130,7 @@ void main() {
       expect(Ide.fromCliName('claude'), equals(Ide.claude));
       expect(Ide.fromCliName('copilot'), equals(Ide.copilot));
       expect(Ide.fromCliName('cline'), equals(Ide.cline));
+      expect(Ide.fromCliName('opencode'), equals(Ide.opencode));
     });
 
     test('when given generic aliases then returns generic', () {

test/ide/opencode_adapter_test.dart

@@ -0,0 +1,112 @@
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:skills/src/core/skill_scanner.dart';
+import 'package:skills/src/ide/adapters/opencode_adapter.dart';
+import 'package:test/test.dart';
+import 'package:test_descriptor/test_descriptor.dart' as d;
+
+void main() {
+  group('Given an OpenCodeAdapter', () {
+    late OpenCodeAdapter adapter;
+
+    setUp(() async {
+      await d.dir('project', [
+        d.dir('.opencode', [d.dir('skills')]),
+      ]).create();
+
+      adapter = OpenCodeAdapter(d.path('project'));
+    });
+
+    group('and a scanned skill', () {
+      late ScannedSkill skill;
+
+      setUp(() async {
+        await d.dir('opencode_pkg', [
+          d.dir('skills', [
+            d.dir('opencode_pkg-code-review', [
+              d.file('SKILL.md', '''
+---
+name: opencode_pkg-code-review
+description: Reviews code.
+---
+
+# Code Review
+
+Review guidelines here.
+'''),
+            ]),
+          ]),
+        ]).create();
+
+        skill = ScannedSkill(
+          packageName: 'opencode_pkg',
+          skillName: 'opencode_pkg-code-review',
+          skillPath: d.path('opencode_pkg/skills/opencode_pkg-code-review'),
+        );
+      });
+
+      test(
+        'when installing then creates skill directory in .opencode/skills/',
+        () async {
+          final name = await adapter.installSkill(skill);
+
+          expect(name, equals('opencode_pkg-code-review'));
+
+          final installed = Directory(
+            p.join(
+              d.path('project'),
+              '.opencode',
+              'skills',
+              'opencode_pkg-code-review',
+            ),
+          );
+          expect(await installed.exists(), isTrue);
+        },
+      );
+
+      test('when installing then SKILL.md is copied unchanged', () async {
+        await adapter.installSkill(skill);
+
+        final content = await File(
+          p.join(
+            d.path('project'),
+            '.opencode',
+            'skills',
+            'opencode_pkg-code-review',
+            'SKILL.md',
+          ),
+        ).readAsString();
+
+        expect(content, contains('name: opencode_pkg-code-review'));
+        expect(content, contains('# Code Review'));
+      });
+    });
+
+    test('when removing then deletes the skill directory', () async {
+      await d.dir('project', [
+        d.dir('.opencode', [
+          d.dir('skills', [
+            d.dir('pkg-skill', [
+              d.file(
+                'SKILL.md',
+                '---\nname: pkg-skill\n'
+                    'description: x\n---\nbody',
+              ),
+            ]),
+          ]),
+        ]),
+      ]).create();
+
+      adapter = OpenCodeAdapter(d.path('project'));
+      await adapter.removeSkill('pkg-skill');
+
+      expect(
+        await Directory(
+          p.join(d.path('project'), '.opencode', 'skills', 'pkg-skill'),
+        ).exists(),
+        isFalse,
+      );
+    });
+  });
+}