fix: dispatch opencode commands via run (#2410)

tests/integrations/test_integration_opencode.py

@@ -1,5 +1,7 @@
 """Tests for OpencodeIntegration."""
 
+from specify_cli.integrations import get_integration
+
 from .test_integration_base_markdown import MarkdownIntegrationTests
 
 
@@ -9,3 +11,49 @@ class TestOpencodeIntegration(MarkdownIntegrationTests):
     COMMANDS_SUBDIR = "command"
     REGISTRAR_DIR = ".opencode/command"
     CONTEXT_FILE = "AGENTS.md"
+
+    def test_build_exec_args_uses_run_command_dispatch(self):
+        integration = get_integration(self.KEY)
+
+        args = integration.build_exec_args(
+            "/speckit.specify build a login page",
+            output_json=False,
+        )
+
+        assert args == [
+            "opencode",
+            "run",
+            "--command",
+            "speckit.specify",
+            "build a login page",
+        ]
+        assert "-p" not in args
+        assert "--output-format" not in args
+
+    def test_build_exec_args_maps_model_and_json_flags(self):
+        integration = get_integration(self.KEY)
+
+        args = integration.build_exec_args(
+            "/speckit.plan add OAuth",
+            model="anthropic/claude-sonnet-4",
+            output_json=True,
+        )
+
+        assert args == [
+            "opencode",
+            "run",
+            "--command",
+            "speckit.plan",
+            "-m",
+            "anthropic/claude-sonnet-4",
+            "--format",
+            "json",
+            "add OAuth",
+        ]
+
+    def test_build_exec_args_keeps_plain_prompt_dispatch(self):
+        integration = get_integration(self.KEY)
+
+        args = integration.build_exec_args("explain this repository", output_json=False)
+
+        assert args == ["opencode", "run", "explain this repository"]