diff --git a/.gitea/workflows/checks.yaml b/.gitea/workflows/checks.yaml
deleted file mode 100644
index e0e576a40..000000000
--- a/.gitea/workflows/checks.yaml
+++ /dev/null
@@ -1,9 +0,0 @@
-name: checks
-on:
-  pull_request:
-jobs:
-  checks-impure:
-    runs-on: nix
-    steps:
-      - uses: actions/checkout@v4
-      - run: nix run .#impure-checks
diff --git a/checks/flake-module.nix b/checks/flake-module.nix
index c8d703060..d14af606e 100644
--- a/checks/flake-module.nix
+++ b/checks/flake-module.nix
@@ -36,7 +36,6 @@ in
     ++ filter pathExists [
       ./devshell/flake-module.nix
       ./flash/flake-module.nix
-      ./impure/flake-module.nix
       ./installation/flake-module.nix
       ./update/flake-module.nix
       ./morph/flake-module.nix
diff --git a/checks/impure/flake-module.nix b/checks/impure/flake-module.nix
deleted file mode 100644
index a20c02d82..000000000
--- a/checks/impure/flake-module.nix
+++ /dev/null
@@ -1,51 +0,0 @@
-{
-  perSystem =
-    {
-      pkgs,
-      lib,
-      self',
-      ...
-    }:
-    {
-      # a script that executes all other checks
-      packages.impure-checks = pkgs.writeShellScriptBin "impure-checks" ''
-        #!${pkgs.bash}/bin/bash
-        set -euo pipefail
-
-        unset CLAN_DIR
-
-        export PATH="${
-          lib.makeBinPath (
-            [
-              pkgs.gitMinimal
-              pkgs.nix
-              pkgs.coreutils
-              pkgs.rsync # needed to have rsync installed on the dummy ssh server
-            ]
-            ++ self'.packages.clan-cli-full.runtimeDependencies
-          )
-        }"
-        ROOT=$(git rev-parse --show-toplevel)
-        cd "$ROOT/pkgs/clan-cli"
-
-        # Set up custom git configuration for tests
-        export GIT_CONFIG_GLOBAL=$(mktemp)
-        git config --file "$GIT_CONFIG_GLOBAL" user.name "Test User"
-        git config --file "$GIT_CONFIG_GLOBAL" user.email "test@example.com"
-        export GIT_CONFIG_SYSTEM=/dev/null
-
-        # this disables dynamic dependency loading in clan-cli
-        export CLAN_NO_DYNAMIC_DEPS=1
-
-        jobs=$(nproc)
-        # Spawning worker in pytest is relatively slow, so we limit the number of jobs to 13
-        # (current number of impure tests)
-        jobs="$((jobs > 6 ? 6 : jobs))"
-
-        nix develop "$ROOT#clan-cli" -c bash -c "TMPDIR=/tmp python -m pytest -n $jobs -m impure ./clan_cli $@"
-
-        # Clean up temporary git config
-        rm -f "$GIT_CONFIG_GLOBAL"
-      '';
-    };
-}
diff --git a/docs/site/guides/contributing/debugging.md b/docs/site/guides/contributing/debugging.md
index 32bc9bc8b..36fcd2dfe 100644
--- a/docs/site/guides/contributing/debugging.md
+++ b/docs/site/guides/contributing/debugging.md
@@ -90,13 +90,10 @@ export CLAN_DEBUG_COMMANDS=1
 These options help you pinpoint the source and context of print messages and debug logs during development.
 
 
-
 ## Analyzing Performance
 
 To understand what's causing slow performance, set the environment variable `export CLAN_CLI_PERF=1`. When you complete a clan command, you'll see a summary of various performance metrics, helping you identify what's taking up time.
 
-
-
 ## See all possible packages and tests
 
 To quickly show all possible packages and tests execute:
@@ -155,28 +152,16 @@ To test the CLI locally in a development environment and set breakpoints for deb
 
 ## Test Locally in a Nix Sandbox
 
-To run tests in a Nix sandbox, you have two options depending on whether your test functions have been marked as impure or not:
-
-### Running Tests Marked as Impure
-
-If your test functions need to execute `nix build` and have been marked as impure because you can't execute `nix build` inside a Nix sandbox, use the following command:
+To run tests in a Nix sandbox:
 
 ```bash
-nix run .#impure-checks -L
+nix build .#checks.x86_64-linux.clan-pytest-with-core
 ```
 
-This command will run the impure test functions.
-
-### Running Pure Tests
-
-For test functions that have not been marked as impure and don't require executing `nix build`, you can use the following command:
-
 ```bash
-nix build .#checks.x86_64-linux.clan-pytest --rebuild
+nix build .#checks.x86_64-linux.clan-pytest-without-core
 ```
 
-This command will run all pure test functions.
-
 ### Inspecting the Nix Sandbox
 
 If you need to inspect the Nix sandbox while running tests, follow these steps:
diff --git a/pkgs/clan-cli/README.md b/pkgs/clan-cli/README.md
index 69f496ea5..9fec4d182 100644
--- a/pkgs/clan-cli/README.md
+++ b/pkgs/clan-cli/README.md
@@ -32,16 +32,12 @@ You can also run a single test like this:
 pytest -n0 -s tests/test_secrets_cli.py::test_users
 ```
 
-## Run tests in nix container
-
-Run all impure checks
+Run all checks in a sandbox
 
 ```bash
-nix run .#impure-checks
+nix build .#checks.x86_64-linux.clan-pytest-with-core
 ```
 
-Run all checks
-
 ```bash
-nix flake check
+nix build .#checks.x86_64-linux.clan-pytest-without-core
 ```