fix: update default model value to 'auto' in action.yml and related tests

Author: PunGrumpy

.changeset/clean-frogs-attack.md

@@ -0,0 +1,5 @@
+---
+"cursor-action": patch
+---
+
+Update default model to "auto"

README.md

@@ -30,7 +30,7 @@
 | `api-key`           | ✅       | —                   | Your Cursor API key. Store as a secret.                                                              |
 | `prompt`            | ✅       | —                   | The prompt to pass to `cursor-agent`.                                                                |
 | `cursor-version`    | ❌       | `latest`            | Cursor CLI build to install. Use `latest` or an exact Cursor lab build id like `2026.03.20-44cb435`. |
-| `model`             | ❌       | `claude-sonnet-4-5` | Model for the agent to use.                                                                          |
+| `model`             | ❌       | `auto`              | Model for the agent to use.                                                                          |
 | `working-directory` | ❌       | `.`                 | Directory the agent operates in.                                                                     |
 | `permissions`       | ❌       | `read-only`         | Agent permissions: `read-only`, `read-write`, or `full`.                                             |
 | `timeout`           | ❌       | `300`               | Timeout in seconds before the agent is killed.                                                       |

__tests__/input.test.ts

@@ -17,7 +17,7 @@ const setupInputs = (overrides: Record<string, string> = {}): void => {
   const defaults: Record<string, string> = {
     "api-key": "test-api-key",
     "cursor-version": "latest",
-    model: "claude-sonnet-4-5",
+    model: "auto",
     permissions: "read-only",
     prompt: "Review this code",
     timeout: "300",
@@ -38,7 +38,7 @@ describe("getInputs", () => {
     expect(inputs.cursorVersion).toBe("latest");
     expect(inputs.apiKey).toBe("test-api-key");
     expect(inputs.prompt).toBe("Review this code");
-    expect(inputs.model).toBe("claude-sonnet-4-5");
+    expect(inputs.model).toBe("auto");
     expect(inputs.permissions).toBe("read-only");
     expect(inputs.timeout).toBe(300);
   });

__tests__/runner.test.ts

@@ -50,7 +50,7 @@ const getExecCall = (): {
 const baseInputs: ActionInputs = {
   apiKey: "test-key",
   cursorVersion: "latest",
-  model: "claude-sonnet-4-5",
+  model: "auto",
   permissions: "read-only",
   prompt: "Analyze this code",
   timeout: 300,
@@ -87,7 +87,7 @@ describe("runAgent", () => {
 
     const { args } = getExecCall();
     expect(args).toContain("--model");
-    expect(args).toContain("claude-sonnet-4-5");
+    expect(args).toContain("auto");
   });
 
   it("includes read-only permission flag", async () => {

action.yml

@@ -23,7 +23,7 @@ inputs:
   model:
     description: "Model to use for the agent"
     required: false
-    default: "claude-sonnet-4-5"
+    default: "auto"
 
   working-directory:
     description: "Working directory for the agent to operate in"

src/input.ts

@@ -15,7 +15,7 @@ export const getInputs = (): ActionInputs => {
     getInput("cursor-version", { required: false }) || "latest";
   const apiKey = getInput("api-key", { required: true });
   const prompt = getInput("prompt", { required: true });
-  const model = getInput("model", { required: false }) || "claude-sonnet-4-5";
+  const model = getInput("model", { required: false }) || "auto";
   const workingDirectory =
     getInput("working-directory", { required: false }) || ".";
   const permissionsRaw =