diff --git a/HISTORY.rst b/HISTORY.rst
index d6803d0b..58613cf6 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -18,6 +18,7 @@ PlatformIO Core 5
     * `pio pkg outdated <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_pack.html>`__ - check for project outdated packages
     * `pio pkg exec <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_exec.html>`_ - run command from package tool (`issue #4163 <https://github.com/platformio/platformio-core/issues/4163>`_)
 
+  - Added support for dependencies declared in a "tool" type package
   - Dropped automatic updates of global libraries and development platforms (`issue #4179 <https://github.com/platformio/platformio-core/issues/4179>`_)
   - Dropped support for "pythonPackages" field in "platform.json" manifest in favor of `Extra Python Dependencies <https://docs.platformio.org/en/latest/scripting/examples/extra_python_packages.html>`__
 
diff --git a/platformio/package/manager/_install.py b/platformio/package/manager/_install.py
index d14338ae..dca2593f 100644
--- a/platformio/package/manager/_install.py
+++ b/platformio/package/manager/_install.py
@@ -20,8 +20,8 @@ import tempfile
 import click
 
 from platformio import app, compat, fs, util
-from platformio.package.exception import PackageException
-from platformio.package.meta import PackageItem
+from platformio.package.exception import PackageException, UnknownPackageError
+from platformio.package.meta import PackageItem, PackageSpec
 from platformio.package.unpack import FileUnpacker
 from platformio.package.vcsclient import VCSClientFactory
 
@@ -115,7 +115,38 @@ class PackageManagerInstallMixin(object):
         return pkg
 
     def install_dependencies(self, pkg):
-        pass
+        assert isinstance(pkg, PackageItem)
+        manifest = self.load_manifest(pkg)
+        dependencies = manifest.get("dependencies")
+        if not dependencies:
+            return
+        self.log.info("Resolving dependencies...")
+        for dependency in dependencies:
+            if not self._install_dependency(dependency):
+                self.log.warning(
+                    click.style(
+                        "Warning! Could not install dependency %s for package '%s'"
+                        % (dependency, pkg.metadata.name),
+                        fg="yellow",
+                    )
+                )
+
+    def _install_dependency(self, dependency):
+        spec = PackageSpec(
+            owner=dependency.get("owner"),
+            name=dependency.get("name"),
+            requirements=dependency.get("version"),
+        )
+        search_filters = {
+            key: value
+            for key, value in dependency.items()
+            if key in ("authors", "platforms", "frameworks")
+        }
+        try:
+            return self._install(spec, search_filters=search_filters or None)
+        except UnknownPackageError:
+            pass
+        return None
 
     def install_from_url(self, url, spec, checksum=None):
         spec = self.ensure_spec(spec)
diff --git a/platformio/package/manager/_uninstall.py b/platformio/package/manager/_uninstall.py
index ff330c64..2fe71753 100644
--- a/platformio/package/manager/_uninstall.py
+++ b/platformio/package/manager/_uninstall.py
@@ -19,7 +19,7 @@ import click
 
 from platformio import fs
 from platformio.package.exception import UnknownPackageError
-from platformio.package.meta import PackageSpec
+from platformio.package.meta import PackageItem, PackageSpec
 
 
 class PackageManagerUninstallMixin(object):
@@ -75,4 +75,18 @@ class PackageManagerUninstallMixin(object):
         return pkg
 
     def uninstall_dependencies(self, pkg):
-        pass
+        assert isinstance(pkg, PackageItem)
+        manifest = self.load_manifest(pkg)
+        if not manifest.get("dependencies"):
+            return
+        self.log.info(click.style("Removing dependencies...", fg="yellow"))
+        for dependency in manifest.get("dependencies"):
+            spec = PackageSpec(
+                owner=dependency.get("owner"),
+                name=dependency.get("name"),
+                requirements=dependency.get("version"),
+            )
+            pkg = self.get_package(spec)
+            if not pkg:
+                continue
+            self._uninstall(pkg)
diff --git a/platformio/package/manager/library.py b/platformio/package/manager/library.py
index f1e8f553..9a428449 100644
--- a/platformio/package/manager/library.py
+++ b/platformio/package/manager/library.py
@@ -15,14 +15,12 @@
 import json
 import os
 
-import click
-
 from platformio.package.exception import (
     MissingPackageManifestError,
     UnknownPackageError,
 )
 from platformio.package.manager.base import BasePackageManager
-from platformio.package.meta import PackageItem, PackageSpec, PackageType
+from platformio.package.meta import PackageSpec, PackageType
 from platformio.project.config import ProjectConfig
 
 
@@ -107,53 +105,3 @@ class LibraryPackageManager(BasePackageManager):  # pylint: disable=too-many-anc
                 return True
 
             raise e
-
-    def install_dependencies(self, pkg):
-        assert isinstance(pkg, PackageItem)
-        manifest = self.load_manifest(pkg)
-        if not manifest.get("dependencies"):
-            return
-        self.log.info("Installing dependencies...")
-        for dependency in manifest.get("dependencies"):
-            if not self._install_dependency(dependency):
-                self.log.warning(
-                    click.style(
-                        "Warning! Could not install dependency %s for package '%s'"
-                        % (dependency, pkg.metadata.name),
-                        fg="yellow",
-                    )
-                )
-
-    def _install_dependency(self, dependency):
-        spec = PackageSpec(
-            owner=dependency.get("owner"),
-            name=dependency.get("name"),
-            requirements=dependency.get("version"),
-        )
-        search_filters = {
-            key: value
-            for key, value in dependency.items()
-            if key in ("authors", "platforms", "frameworks")
-        }
-        try:
-            return self._install(spec, search_filters=search_filters or None)
-        except UnknownPackageError:
-            pass
-        return None
-
-    def uninstall_dependencies(self, pkg):
-        assert isinstance(pkg, PackageItem)
-        manifest = self.load_manifest(pkg)
-        if not manifest.get("dependencies"):
-            return
-        self.log.info(click.style("Removing dependencies...", fg="yellow"))
-        for dependency in manifest.get("dependencies"):
-            spec = PackageSpec(
-                owner=dependency.get("owner"),
-                name=dependency.get("name"),
-                requirements=dependency.get("version"),
-            )
-            pkg = self.get_package(spec)
-            if not pkg:
-                continue
-            self._uninstall(pkg)