diff --git a/.github/workflows/check-pr-base.yml b/.github/workflows/check-pr-base.yml
new file mode 100644
index 00000000..73b71c27
--- /dev/null
+++ b/.github/workflows/check-pr-base.yml
@@ -0,0 +1,22 @@
+name: Git tree checks
+
+on:
+  pull_request:
+    types: [opened, edited, reopened, synchronize]
+  merge_group:
+permissions: read-all
+
+jobs:
+  check_base_ref:
+    name: Only release branches may merge into master
+    runs-on: ubuntu-latest
+    steps:
+      - id: not_based_on_master
+        if: |
+          github.event_name == 'pull_request' &&
+          github.event.pull_request.base.ref == 'master' &&
+          ! startsWith(github.event.pull_request.head.ref, 'release/')
+        run: |
+          echo 'Only `release/*` branches are allowed to merge into `master`.'
+          echo 'Maybe your PR should be merging into `staging`?'
+          exit 1
diff --git a/DEVELOP.md b/DEVELOP.md
index 4f24f4d6..2b9ac7d9 100644
--- a/DEVELOP.md
+++ b/DEVELOP.md
@@ -2,5 +2,5 @@
 
 ## `SpacetimeDB.ClientApi`
 
-To regenerate this namespace, run the `tools/gen-client-api.sh` or the
-`tools/gen-client-api.bat` script.
+To regenerate this namespace, run the `tools~/gen-client-api.sh` or the
+`tools~/gen-client-api.bat` script.
diff --git a/tools~/gen-client-api.bat b/tools~/gen-client-api.bat
new file mode 100644
index 00000000..9eb66c49
--- /dev/null
+++ b/tools~/gen-client-api.bat
@@ -0,0 +1,20 @@
+@echo off
+setlocal
+
+if "%CL_HOME%"=="" (
+  echo "Variable CL_HOME not set"
+  exit /b 1
+)
+
+cd %CL_HOME%\SpacetimeDB\crates\client-api-messages
+cargo run --example get_ws_schema > %CL_HOME%/schema.json
+
+cd %CL_HOME%\SpacetimeDB\crates\cli
+cargo run -- generate -l csharp -n SpacetimeDB.ClientApi ^
+  --json-module %CL_HOME%\schema.json ^
+  -o %CL_HOME%\spacetimedb-csharp-sdk\src\SpacetimeDB\ClientApi
+
+cd %CL_HOME%\spacetimedb-csharp-sdk\src\SpacetimeDB\ClientApi
+del /q _Globals
+
+del %CL_HOME%\schema.json
diff --git a/tools~/gen-client-api.sh b/tools~/gen-client-api.sh
new file mode 100644
index 00000000..91fbe3da
--- /dev/null
+++ b/tools~/gen-client-api.sh
@@ -0,0 +1,15 @@
+#!/bin/sh -eu
+: $CL_HOME
+
+cd $CL_HOME/SpacetimeDB/crates/client-api-messages
+cargo run --example get_ws_schema > $CL_HOME/schema.json
+
+cd $CL_HOME/SpacetimeDB/crates/cli
+cargo run -- generate -l csharp -n SpacetimeDB.ClientApi \
+  --json-module $CL_HOME/schema.json \
+  -o $CL_HOME/spacetimedb-csharp-sdk/src/SpacetimeDB/ClientApi
+
+cd $CL_HOME/spacetimedb-csharp-sdk/src/SpacetimeDB/ClientApi
+rm -rf _Globals
+
+rm -f $CL_HOME/schema.json