diff --git a/src/core/worktree-service.js b/src/core/worktree-service.js
index 1c38a5e..9a1e07b 100644
--- a/src/core/worktree-service.js
+++ b/src/core/worktree-service.js
@@ -383,11 +383,19 @@ export function createWorktreeWorkflowService({ directory, git, stateStore, logg
       return (await git(["rev-parse", "--show-toplevel"], { cwd: directory })).stdout;
     } catch (error) {
       if (isMissingGitRepositoryError(error.message || "")) {
-        throw new Error("This command must run inside a git repository. Initialize a repository first or run it from an existing repo root.");
+        throw new Error("This command must run inside a git repository. Initialize a repository first or run it from an existing repo root.", { cause: error });
       }
       throw error;
     }
   }
+  async function tryGetRepoRoot() {
+    try {
+      return await getRepoRoot();
+    } catch (error) {
+      if (isMissingGitRepositoryError(error.message || "") || isMissingGitRepositoryError(error.cause?.message || "")) return null;
+      throw error;
+    }
+  }
   async function loadWorkflowConfig(repoRoot) {
     const [projectConfig, projectConfigC, sidecarConfig] = await Promise.all([
       readJsonFile(path.join(repoRoot, "opencode.json")),
@@ -668,6 +676,7 @@ export function createWorktreeWorkflowService({ directory, git, stateStore, logg
     prepare,
     cleanup,
     getRepoRoot,
+    tryGetRepoRoot,
     getSessionBinding,
     ensureActiveWorktree,
     recordToolUsage,
diff --git a/src/index.js b/src/index.js
index 132d8d1..7c4bfef 100644
--- a/src/index.js
+++ b/src/index.js
@@ -185,10 +185,11 @@ export const WorktreeWorkflowPlugin = async ({ $, directory, logger: providedLog
     const sessionID = input?.sessionID;
     let binding = null;
     let repoRootForLogging = null;
+    const repoRoot = await service.tryGetRepoRoot();
+    if (!repoRoot) return;
 
     if (classification.requiresIsolation) {
       if (!sessionID) throw new Error(`Isolation required for ${toolName || "tool"} but sessionID is missing.`);
-      const repoRoot = await service.getRepoRoot();
       repoRootForLogging = repoRoot;
       for (const key of rewritePolicy.opaqueArgKeys) {
         if (hasOpaqueRepoRootAbsoluteReference({ value: args[key], repoRoot })) {
@@ -202,7 +203,6 @@ export const WorktreeWorkflowPlugin = async ({ $, directory, logger: providedLog
         workspaceRole: deriveWorkspaceRole({ subagentType: args.subagent_type }),
       });
     } else if (sessionID) {
-      const repoRoot = await service.getRepoRoot();
       repoRootForLogging = repoRoot;
       const { activeTask } = await service.getSessionBinding({ repoRoot, sessionID });
       if (activeTask?.worktree_path) binding = { repoRoot, task: activeTask };
@@ -290,15 +290,15 @@ export const WorktreeWorkflowPlugin = async ({ $, directory, logger: providedLog
     const toolName = input?.tool;
     const args = input?.args || {};
     const sessionID = input?.sessionID;
+    const repoRoot = await service.tryGetRepoRoot();
+    if (!repoRoot) return;
     if (toolName === "worktree_prepare" && sessionID) {
       const result = output?.metadata?.result;
       if (result?.branch && result?.worktree_path) {
-        const repoRoot = await service.getRepoRoot();
         await service.updateStateForPrepare(repoRoot, sessionID, result, "manual");
       }
     }
     if (toolName === "task" && sessionID) {
-      const repoRoot = await service.getRepoRoot();
       const handoffPath = resolveSafeHandoffPath({
         rawPath: extractHandoffArtifactPath(args.prompt),
         repoRoot,
@@ -354,7 +354,8 @@ export const WorktreeWorkflowPlugin = async ({ $, directory, logger: providedLog
     const existingSystem = Array.isArray(output?.system) ? output.system : [];
     if (!sessionID || existingSystem.some((entry) => entry.includes(WORKSPACE_SYSTEM_CONTEXT_MARKER))) return;
 
-    const repoRoot = await service.getRepoRoot();
+    const repoRoot = await service.tryGetRepoRoot();
+    if (!repoRoot) return;
     const { activeTask } = await service.getSessionBinding({ repoRoot, sessionID });
     if (!activeTask?.worktree_path) return;
 
diff --git a/test/hook-enforcement.test.js b/test/hook-enforcement.test.js
index 12ff7c2..3199518 100644
--- a/test/hook-enforcement.test.js
+++ b/test/hook-enforcement.test.js
@@ -6,6 +6,22 @@ import path from "node:path";
 import { createRuntimeStateStore } from "../src/runtime/state-store.js";
 import { createPlugin, createRemoteRepo, executeToolWithMetadata, git, runCommandExecuteBeforeHook, runExperimentalChatSystemTransformHook, runToolExecuteAfterHook, runToolExecuteBeforeHook } from "../test-support/helpers.js";
 
+test("hooks are no-op outside git repository", async () => {
+  const fixture = await fs.mkdtemp(path.join(process.env.TMPDIR || "/tmp", "worktree-plugin-no-repo-"));
+  try {
+    const plugin = await createPlugin(fixture);
+    const output = { args: { filePath: "tracked.txt" } };
+    await plugin["tool.execute.before"]({ tool: "write", sessionID: "outside-repo" }, output);
+    assert.equal(output.args.filePath, "tracked.txt");
+    await plugin["tool.execute.after"]({ tool: "write", sessionID: "outside-repo" }, {});
+    const system = { system: ["Base system prompt"] };
+    await plugin["experimental.chat.system.transform"]({ sessionID: "outside-repo" }, system);
+    assert.deepEqual(system.system, ["Base system prompt"]);
+  } finally {
+    await fs.rm(fixture, { recursive: true, force: true });
+  }
+});
+
 test("tool.execute.before provisions worktree and rewrites mutating filePath", async () => {
   const fixture = await createRemoteRepo();
   const logs = [];