diff --git a/README.md b/README.md
index aaf5ef5..84c9815 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,9 @@ Add a local config and GitHub Actions workflow:
 npx @openclaw/plugin-inspector init --ci
 ```
 
+`init --ci` detects `packageManager` and common lockfiles. Pass
+`--package-manager pnpm`, `npm`, `yarn`, or `bun` when you want to override it.
+
 Or install it as a dev dependency:
 
 ```bash
diff --git a/src/advanced.js b/src/advanced.js
index 657fd51..0ffd2e7 100644
--- a/src/advanced.js
+++ b/src/advanced.js
@@ -138,6 +138,7 @@ export {
   buildPluginInspectorConfig,
   defaultInitConfigPath,
   defaultInitWorkflowPath,
+  detectPackageManager,
   renderGithubActionsWorkflow,
   writePluginInspectorInit,
 } from "./init.js";
diff --git a/src/cli.js b/src/cli.js
index 68a455e..8c05832 100755
--- a/src/cli.js
+++ b/src/cli.js
@@ -95,7 +95,7 @@ async function runInit(commandArgs) {
   const pluginRoot = readFlag(commandArgs, "--plugin-root") ?? readFlag(commandArgs, "--root");
   const configPath = readFlag(commandArgs, "--config") ?? undefined;
   const workflowPath = readFlag(commandArgs, "--workflow") ?? undefined;
-  const packageManager = readFlag(commandArgs, "--package-manager") ?? "npm";
+  const packageManager = readFlag(commandArgs, "--package-manager") ?? undefined;
   const result = await writePluginInspectorInit({
     pluginRoot,
     configPath,
diff --git a/src/init.js b/src/init.js
index e8cd212..c2cd6ab 100644
--- a/src/init.js
+++ b/src/init.js
@@ -9,6 +9,7 @@ export const defaultInitWorkflowPath = ".github/workflows/plugin-inspector.yml";
 export async function writePluginInspectorInit(options = {}) {
   const pluginRoot = path.resolve(options.pluginRoot ?? options.cwd ?? process.cwd());
   const configPath = path.resolve(pluginRoot, options.configPath ?? defaultInitConfigPath);
+  const packageManager = options.packageManager ?? (await detectPackageManager(pluginRoot));
   const written = [];
 
   if (existsSync(configPath) && options.force !== true) {
@@ -26,11 +27,11 @@ export async function writePluginInspectorInit(options = {}) {
       throw new Error(`${path.relative(pluginRoot, workflowPath)} already exists; pass --force to overwrite it`);
     }
     await mkdir(path.dirname(workflowPath), { recursive: true });
-    await writeFile(workflowPath, renderGithubActionsWorkflow({ packageManager: options.packageManager }), "utf8");
+    await writeFile(workflowPath, renderGithubActionsWorkflow({ packageManager }), "utf8");
     written.push(workflowPath);
   }
 
-  return { pluginRoot, configPath, written };
+  return { pluginRoot, configPath, packageManager, written };
 }
 
 export async function buildPluginInspectorConfig(options = {}) {
@@ -88,6 +89,29 @@ ${setup.corepack ? "      - run: corepack enable\n" : ""}      - run: ${setup.in
 `;
 }
 
+export async function detectPackageManager(pluginRoot) {
+  const root = path.resolve(pluginRoot ?? process.cwd());
+  const packageJson = await readJsonIfExists(path.join(root, "package.json"));
+  const packageManager = packageJson?.packageManager;
+  if (typeof packageManager === "string") {
+    const [name] = packageManager.split("@");
+    if (["npm", "pnpm", "yarn", "bun"].includes(name)) {
+      return name;
+    }
+  }
+
+  if (existsSync(path.join(root, "pnpm-lock.yaml"))) {
+    return "pnpm";
+  }
+  if (existsSync(path.join(root, "yarn.lock"))) {
+    return "yarn";
+  }
+  if (existsSync(path.join(root, "bun.lockb")) || existsSync(path.join(root, "bun.lock"))) {
+    return "bun";
+  }
+  return "npm";
+}
+
 function inferSourceRoot(packageJson) {
   const entrypoints = [
     packageJson?.openclaw?.entrypoint,
diff --git a/test/api.test.js b/test/api.test.js
index a9d3640..6d7f505 100644
--- a/test/api.test.js
+++ b/test/api.test.js
@@ -135,6 +135,7 @@ test("public API can initialize plugin inspector files", async () => {
   const workflow = await readFile(path.join(pluginRoot, ".github", "workflows", "plugin-inspector.yml"), "utf8");
 
   assert.equal(result.written.length, 2);
+  assert.equal(result.packageManager, "npm");
   assert.equal(config.plugin.id, "weather");
   assert.equal(config.capture.mockSdk, true);
   assert.match(workflow, /npx @openclaw\/plugin-inspector ci --no-openclaw --runtime --mock-sdk/);
diff --git a/test/cli.test.js b/test/cli.test.js
index dff38e0..b40f6c7 100644
--- a/test/cli.test.js
+++ b/test/cli.test.js
@@ -211,6 +211,20 @@ test("init command writes plugin config and CI workflow", async () => {
   assert.match(workflow, /pnpm dlx @openclaw\/plugin-inspector ci --no-openclaw --runtime --mock-sdk/);
 });
 
+test("init command detects plugin package managers", async () => {
+  const rootDir = await createCliPluginRoot("plugin-inspector-cli-init-pm-");
+  const cliPath = path.resolve("src/cli.js");
+  await writeFile(path.join(rootDir, "pnpm-lock.yaml"), "lockfileVersion: '9.0'\n", "utf8");
+
+  await execFileAsync(process.execPath, [cliPath, "init", "--plugin-root", rootDir, "--ci", "--force"]);
+  const workflow = await readFile(path.join(rootDir, ".github", "workflows", "plugin-inspector.yml"), "utf8");
+
+  assert.match(workflow, /cache: pnpm/);
+  assert.match(workflow, /corepack enable/);
+  assert.match(workflow, /pnpm install --frozen-lockfile/);
+  assert.match(workflow, /pnpm dlx @openclaw\/plugin-inspector ci --no-openclaw --runtime --mock-sdk/);
+});
+
 async function createCliPluginRoot(prefix) {
   const rootDir = await mkdtemp(path.join(os.tmpdir(), prefix));
   await mkdir(path.join(rootDir, "src"), { recursive: true });