diff --git a/.vscode-test.mjs b/.vscode-test.mjs
index 1817f0b..ddc06ce 100644
--- a/.vscode-test.mjs
+++ b/.vscode-test.mjs
@@ -1,8 +1,10 @@
 import { defineConfig } from '@vscode/test-cli';
+import { fileURLToPath } from 'node:url';
 
 export default defineConfig({
     files: 'out/test/**/*.vscode.test.js',
     version: 'stable',
+    workspaceFolder: fileURLToPath(new URL('./test/fixtures/pixi-project/', import.meta.url)),
     mocha: {
         ui: 'tdd',
         timeout: 20_000,
diff --git a/.vscode/launch.json b/.vscode/launch.json
index 0fed5b9..1968b8d 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -5,7 +5,7 @@
             "name": "Run Extension",
             "type": "extensionHost",
             "request": "launch",
-            "args": ["--extensionDevelopmentPath=${workspaceFolder}"],
+            "args": ["${workspaceFolder}/test/fixtures/pixi-project", "--extensionDevelopmentPath=${workspaceFolder}"],
             "outFiles": ["${workspaceFolder}/dist/**/*.js"],
             "preLaunchTask": "${defaultBuildTask}"
         }
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 45c4565..2095f60 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -1,6 +1,15 @@
 {
     "version": "2.0.0",
     "tasks": [
+        {
+            "type": "npm",
+            "script": "compile",
+            "problemMatcher": [],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        },
         {
             "type": "npm",
             "script": "watch",
@@ -11,8 +20,7 @@
                 "group": "watchers"
             },
             "group": {
-                "kind": "build",
-                "isDefault": true
+                "kind": "build"
             }
         },
         {
diff --git a/package.json b/package.json
index 0b563b3..144e63f 100644
--- a/package.json
+++ b/package.json
@@ -74,7 +74,7 @@
         "typecheck": "tsc -p . --noEmit",
         "compile-tests": "node -e \"require('fs').rmSync('out', { recursive: true, force: true })\" && tsc -p . --outDir out",
         "test:unit": "npm run compile-tests && node --test out/test/**/*.unit.test.js",
-        "test:vscode": "npm run compile-tests && npm run compile && vscode-test",
+        "test:vscode": "npm run compile-tests && npm run compile && pixi install --locked --manifest-path test/fixtures/pixi-project/pixi.toml && vscode-test",
         "test": "npm run typecheck && npm run test:unit && npm run test:vscode",
         "watch-tests": "tsc -p . -w --outDir out",
         "pretest": "npm run lint && npm run format:check",
diff --git a/src/extension.ts b/src/extension.ts
index 4144613..154bef4 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -3,6 +3,7 @@ import { ExtensionContext, window } from 'vscode';
 
 import { registerLogger } from './common/logging';
 import { setPersistentState } from './common/persistentState';
+import { EXTENSION_ID } from './common/utils';
 import { PixiEnvManager } from './pixi/envManager';
 import { PixiPackageManager } from './pixi/projectManager';
 import { getPixi, runPixi } from './pixi/utils';
@@ -11,38 +12,48 @@ import { getEnvExtApi } from './pythonEnvsApi';
 const MINIMUM_PIXI_VERSION = '0.53.0';
 
 export async function activate(context: ExtensionContext) {
-    const api = await getEnvExtApi();
-
     const log = window.createOutputChannel('Pixi Environment Manager', { log: true });
     context.subscriptions.push(log, registerLogger(log));
 
-    // Validate Pixi installation
-    const stdout = await runPixi(['--version']);
-    const versionMatch = stdout.trim().match(/^pixi (\d+\.\d+\.\d+)/);
-    if (!versionMatch) {
-        const errorMsg = `Found invalid Pixi binary at ${await getPixi()}.`;
-        window.showErrorMessage(errorMsg);
-        throw new Error(errorMsg);
-    }
-
-    const currentVersion = versionMatch[1];
-
-    // Check if the current version meets the minimum requirement using semver
-    if (!semver.gte(currentVersion, MINIMUM_PIXI_VERSION)) {
-        const errorMsg =
-            `Pixi version ${currentVersion} is too old. ` +
-            `This extension requires Pixi version ${MINIMUM_PIXI_VERSION} or newer. ` +
-            `Please update Pixi by running: pixi self-update`;
-        window.showErrorMessage(errorMsg);
-        throw new Error(errorMsg);
+    try {
+        log.info('Activating Pixi Code');
+        const api = await getEnvExtApi();
+
+        // Validate Pixi installation
+        const stdout = await runPixi(['--version']);
+        const versionMatch = stdout.trim().match(/^pixi (\d+\.\d+\.\d+)/);
+        if (!versionMatch) {
+            const errorMsg = `Found invalid Pixi binary at ${await getPixi()}.`;
+            window.showErrorMessage(errorMsg);
+            throw new Error(errorMsg);
+        }
+
+        const currentVersion = versionMatch[1];
+
+        // Check if the current version meets the minimum requirement using semver
+        if (!semver.gte(currentVersion, MINIMUM_PIXI_VERSION)) {
+            const errorMsg =
+                `Pixi version ${currentVersion} is too old. ` +
+                `This extension requires Pixi version ${MINIMUM_PIXI_VERSION} or newer. ` +
+                `Please update Pixi by running: pixi self-update`;
+            window.showErrorMessage(errorMsg);
+            throw new Error(errorMsg);
+        }
+
+        log.info(`Using Pixi ${currentVersion}`);
+
+        // Setup the persistent state for the extension.
+        setPersistentState(context);
+
+        const manager = new PixiEnvManager(api, log);
+        context.subscriptions.push(api.registerEnvironmentManager(manager, { extensionId: EXTENSION_ID }));
+        log.info('Registered Pixi environment manager');
+
+        const packageManager = new PixiPackageManager(api, log);
+        context.subscriptions.push(api.registerPackageManager(packageManager, { extensionId: EXTENSION_ID }));
+        log.info('Registered Pixi package manager');
+    } catch (error) {
+        log.error('Pixi Code activation failed', error);
+        throw error;
     }
-
-    // Setup the persistent state for the extension.
-    setPersistentState(context);
-
-    const manager = new PixiEnvManager(api, log);
-    context.subscriptions.push(api.registerEnvironmentManager(manager));
-
-    const packageManager = new PixiPackageManager(api, log);
-    context.subscriptions.push(api.registerPackageManager(packageManager));
 }
diff --git a/src/test/extension.vscode.test.ts b/src/test/extension.vscode.test.ts
index 5952cf0..94f6456 100644
--- a/src/test/extension.vscode.test.ts
+++ b/src/test/extension.vscode.test.ts
@@ -1,11 +1,68 @@
 import * as assert from 'node:assert/strict';
+import { readFile, rm, writeFile } from 'node:fs/promises';
+import * as path from 'node:path';
 
+import { PythonEnvironmentApi } from '@vscode/python-environments';
 import * as vscode from 'vscode';
 
+import { PIXI_MANAGER_ID } from '../common/utils';
+
 suite('Pixi Code extension', () => {
     test('contributes an empty default Pixi executable setting', () => {
         const setting = vscode.workspace.getConfiguration('pixi-code').inspect<string>('pixiExecutable');
 
         assert.equal(setting?.defaultValue, '');
     });
+
+    test('selects the Pixi default environment through Python Environments', async function () {
+        this.timeout(120_000);
+
+        const pixiExtension = vscode.extensions.getExtension('renan-r-santos.pixi-code');
+        const pythonEnvsExtension =
+            vscode.extensions.getExtension<PythonEnvironmentApi>('ms-python.vscode-python-envs');
+        assert.ok(pixiExtension, 'Pixi Code must be loaded in the extension test host');
+        assert.ok(pythonEnvsExtension, 'Python Environments must be installed in the extension test host');
+
+        const api = await pythonEnvsExtension.activate();
+        await pixiExtension.activate();
+
+        const environments = await api.getEnvironments('all');
+        const pixiEnvironment = environments.find(
+            (environment) =>
+                environment.envId.managerId === PIXI_MANAGER_ID && environment.name.startsWith('pixi-project:default'),
+        );
+        assert.ok(pixiEnvironment, 'The Pixi fixture default environment must be discoverable');
+
+        const workspaceFolder = vscode.workspace.workspaceFolders?.[0];
+        assert.ok(workspaceFolder, 'The Pixi fixture must be open as the test workspace');
+        const scope = workspaceFolder.uri;
+        const settingsPath = path.join(scope.fsPath, '.vscode', 'settings.json');
+        const originalSettings = await readFile(settingsPath).catch((error: NodeJS.ErrnoException) => {
+            if (error.code === 'ENOENT') {
+                return undefined;
+            }
+            throw error;
+        });
+        const previousEnvironment = await api.getEnvironment(scope);
+        try {
+            await api.setEnvironment(scope, pixiEnvironment);
+            const selectedEnvironment = await api.getEnvironment(scope);
+
+            assert.equal(
+                selectedEnvironment?.envId.id,
+                pixiEnvironment.envId.id,
+                'Python Environments did not select the Pixi interpreter; check its output for a missing manager',
+            );
+        } finally {
+            try {
+                await api.setEnvironment(scope, previousEnvironment);
+            } finally {
+                if (originalSettings) {
+                    await writeFile(settingsPath, originalSettings);
+                } else {
+                    await rm(settingsPath, { force: true });
+                }
+            }
+        }
+    });
 });
diff --git a/test/fixtures/pixi-project/.gitattributes b/test/fixtures/pixi-project/.gitattributes
new file mode 100644
index 0000000..997504b
--- /dev/null
+++ b/test/fixtures/pixi-project/.gitattributes
@@ -0,0 +1,2 @@
+# SCM syntax highlighting & preventing 3-way merges
+pixi.lock merge=binary linguist-language=YAML linguist-generated=true -diff
diff --git a/test/fixtures/pixi-project/.gitignore b/test/fixtures/pixi-project/.gitignore
new file mode 100644
index 0000000..ae849e6
--- /dev/null
+++ b/test/fixtures/pixi-project/.gitignore
@@ -0,0 +1,3 @@
+# pixi environments
+.pixi/*
+!.pixi/config.toml
diff --git a/test/fixtures/pixi-project/hello_world.py b/test/fixtures/pixi-project/hello_world.py
new file mode 100644
index 0000000..cd6ecd9
--- /dev/null
+++ b/test/fixtures/pixi-project/hello_world.py
@@ -0,0 +1,2 @@
+if __name__ == "__main__":
+    print("Hello, World!")
diff --git a/test/fixtures/pixi-project/pixi.lock b/test/fixtures/pixi-project/pixi.lock
new file mode 100644
index 0000000..95355b5
--- /dev/null
+++ b/test/fixtures/pixi-project/pixi.lock
@@ -0,0 +1,604 @@
+version: 7
+platforms:
+- name: linux-64
+  virtual-packages:
+  - __unix=0=0
+  - __linux=4.18
+  - __glibc=2.28
+  - __archspec=0=x86_64
+- name: win-64
+  virtual-packages:
+  - __win=10.0
+  - __archspec=0=x86_64
+environments:
+  default:
+    channels:
+    - url: https://conda.anaconda.org/conda-forge/
+    packages:
+      linux-64:
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-20_gnu.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-hda65f42_10.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/icu-78.3-py310h44b86e0_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.46.1-default_hbd61a6d_102.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libexpat-2.8.5-hd2095e1_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libffi-3.5.2-h3435931_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-16.2.0-ha9f2e26_7.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libgomp-16.2.0-he0feb66_7.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/liblzma-5.8.3-hb03c661_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libmpdec-4.0.0-hb03c661_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libsqlite-3.53.4-h13e7031_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-16.2.0-h934c35e_7.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.42.4-hcfc3c73_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.3.2-h25fd6f3_3.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.6-hdb14827_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/openssl-3.6.4-h781a0a9_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/python-3.14.0-h32b2ec7_103_cp314.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/readline-8.3-hd6e31c0_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.13-noxft_h1df4ec4_4.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/zstd-1.5.7-hb78ec9c_7.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.7.22-hbd8a1cb_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/python_abi-3.14-9_cp314.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2026c-h151e31d_0.conda
+      win-64:
+      - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.7.22-h4c7d964_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/python_abi-3.14-9_cp314.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2026c-h151e31d_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/bzip2-1.0.8-h0ad9c76_10.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/libexpat-2.8.5-hac47afa_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/libffi-3.5.2-h3d046cb_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/liblzma-5.8.3-hfd05255_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/libmpdec-4.0.0-hfd05255_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/libsqlite-3.53.4-hf5d6505_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/libzlib-1.3.2-hfd05255_3.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/openssl-3.6.4-hf411b9b_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/python-3.14.0-h4b44e0e_103_cp314.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/tk-8.6.13-h967ab96_4.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/ucrt-10.0.26100.0-h57928b3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/vc-14.5-ha367084_41.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/vc14_runtime-14.51.36247-habf1de7_41.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/vcomp14-14.51.36247-habf1de7_41.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/zstd-1.5.7-h534d264_7.conda
+packages:
+- conda: https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-20_gnu.conda
+  build_number: 20
+  sha256: 1dd3fffd892081df9726d7eb7e0dea6198962ba775bd88842135a4ddb4deb3c9
+  md5: a9f577daf3de00bca7c3c76c0ecbd1de
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgomp >=7.5.0
+  constrains:
+  - openmp_impl <0.0a0
+  license: BSD-3-Clause
+  license_family: BSD
+  run_exports:
+    strong:
+    - _openmp_mutex >=4.5
+  size: 28948
+  timestamp: 1770939786096
+- conda: https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-hda65f42_10.conda
+  sha256: 1a0d382c515ebf55f8ee1f38c8b81bc95af5c2acc42ad53b66bc5df932032f96
+  md5: e675fabcf81499adc7edf58124fb1e01
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  license: bzip2-1.0.6
+  license_family: BSD
+  run_exports:
+    weak:
+    - bzip2 >=1.0.8,<2.0a0
+  size: 257808
+  timestamp: 1785906269155
+- conda: https://conda.anaconda.org/conda-forge/linux-64/icu-78.3-py310h44b86e0_2.conda
+  sha256: 9f07834f0c546ab14d885ce0366285f61f44e326c0edd1fc63b8294e113ae432
+  md5: 72a381cbad04f24b1c2a43ef707f45b4
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libstdcxx >=14
+  - libgcc >=14
+  license: MIT
+  license_family: MIT
+  run_exports:
+    weak:
+    - icu >=78.3,<79.0a0
+  size: 14459115
+  timestamp: 1786545741408
+- conda: https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.46.1-default_hbd61a6d_102.conda
+  sha256: 27d83f1188cd19bcb7754a078b3fa7f4cfb8527f8eb2fde54dd01fc529d1adec
+  md5: 449500f2c089da11c40f5c21312e3e07
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - zstd >=1.5.7,<1.6.0a0
+  constrains:
+  - binutils_impl_linux-64 2.46.1
+  license: GPL-3.0-only
+  license_family: GPL
+  run_exports: {}
+  size: 745303
+  timestamp: 1784214507189
+- conda: https://conda.anaconda.org/conda-forge/linux-64/libexpat-2.8.5-hd2095e1_0.conda
+  sha256: 6de73033a7c5f712c9c5a54124e4581e025691029835e5bceaf10a333a7e7bc0
+  md5: 72cfd2b95b0540247220b42f58a148d7
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=15
+  constrains:
+  - expat 2.8.5.*
+  license: MIT
+  license_family: MIT
+  run_exports: {}
+  size: 77893
+  timestamp: 1790346247149
+- conda: https://conda.anaconda.org/conda-forge/linux-64/libffi-3.5.2-h3435931_0.conda
+  sha256: 31f19b6a88ce40ebc0d5a992c131f57d919f73c0b92cd1617a5bec83f6e961e6
+  md5: a360c33a5abe61c07959e449fa1453eb
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  license: MIT
+  license_family: MIT
+  run_exports:
+    weak:
+    - libffi >=3.5.2,<3.6.0a0
+  size: 58592
+  timestamp: 1769456073053
+- conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-16.2.0-ha9f2e26_7.conda
+  sha256: e031634c3a928f9594eba868bc46ef5230d6571a364a0c63215b06c4563bfcea
+  md5: 735629b400b70eeab21a2ba8f5b1c2ce
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - _openmp_mutex >=4.5
+  constrains:
+  - libgcc-ng ==16.2.0=*_7
+  - libgomp 16.2.0 he0feb66_7
+  license: GPL-3.0-only WITH GCC-exception-3.1
+  license_family: GPL
+  run_exports: {}
+  size: 1058444
+  timestamp: 1790303109576
+- conda: https://conda.anaconda.org/conda-forge/linux-64/libgomp-16.2.0-he0feb66_7.conda
+  sha256: 92a0bb350c7be6a4eedcb4e111c60aefd176018e6b1c009a6e025dbe9bbcd758
+  md5: d904c7ddd95e026254b4b80808ee9e12
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  license: GPL-3.0-only WITH GCC-exception-3.1
+  license_family: GPL
+  run_exports:
+    strong:
+    - _openmp_mutex >=4.5
+  size: 640566
+  timestamp: 1790303046034
+- conda: https://conda.anaconda.org/conda-forge/linux-64/liblzma-5.8.3-hb03c661_1.conda
+  sha256: 9787df8c22a59c9a70d3e5a10db9ad663485e75e9ccc3f09bd092cb7b95e0dab
+  md5: 1390b7c5ac0b1d8e447bc5efa6d3c8c2
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  constrains:
+  - xz 5.8.3.*
+  license: 0BSD
+  run_exports:
+    weak:
+    - liblzma >=5.8.3,<6.0a0
+  size: 112995
+  timestamp: 1786348617826
+- conda: https://conda.anaconda.org/conda-forge/linux-64/libmpdec-4.0.0-hb03c661_2.conda
+  sha256: 46820b4a835e175940ae20bec00fdddaff804cda27a1408ab1b95e77a2196437
+  md5: fcfed1dc5053eb1901b66e7b1fc32588
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  license: BSD-2-Clause
+  license_family: BSD
+  run_exports: {}
+  size: 92759
+  timestamp: 1786650399772
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diff --git a/test/fixtures/pixi-project/pixi.toml b/test/fixtures/pixi-project/pixi.toml
new file mode 100644
index 0000000..e6e5aad
--- /dev/null
+++ b/test/fixtures/pixi-project/pixi.toml
@@ -0,0 +1,12 @@
+[workspace]
+authors = ["Lars Kaiser <lars.kaiser@posteo.de>"]
+channels = ["conda-forge"]
+name = "pixi-project"
+platforms = ["win-64", "linux-64"]
+version = "0.1.0"
+
+[tasks]
+hello_world = { cmd = "python hello_world.py", description = "Hello World Command" }
+
+[dependencies]
+python = "3.14.*"