diff --git a/tests/agent/runner.ts b/tests/agent/runner.ts
new file mode 100644
index 0000000..178d55a
--- /dev/null
+++ b/tests/agent/runner.ts
@@ -0,0 +1,17 @@
+import type { RuneConfig } from "../../src/types.ts";
+
+export interface AgentResult {
+  files: string[];
+}
+
+export interface AgentRunner {
+  readonly tier: number;
+  runPlan(
+    projectDir: string,
+    changeName: string,
+    docName: string,
+    config: RuneConfig,
+  ): Promise<AgentResult>;
+  runBuild(projectDir: string, changeName: string, config: RuneConfig): Promise<AgentResult>;
+  runArchive(projectDir: string, changeName: string, config: RuneConfig): Promise<AgentResult>;
+}