diff --git a/core/tools/ldml-const-builder/build.sh b/core/tools/ldml-const-builder/build.sh
index 8c8bc364b5..dbee106f5a 100755
--- a/core/tools/ldml-const-builder/build.sh
+++ b/core/tools/ldml-const-builder/build.sh
@@ -9,35 +9,44 @@ THIS_SCRIPT="$(readlink -f "${BASH_SOURCE[0]}")"
 ## END STANDARD BUILD SCRIPT INCLUDE
 
 . "$KEYMAN_ROOT/resources/build/utils.inc.sh"
+. "$KEYMAN_ROOT/resources/build/node.inc.sh"
 
 CORE_LDML_H_FILE="../../include/ldml/keyman_core_ldml.h"
+CORE_LDML_TS_FILE="../../include/ldml/keyman_core_ldml.ts"
 
 ################################ Main script ################################
 
-builder_describe "Build and run the constant builder for LDML" clean build run
+builder_describe "Build and run the constant builder for LDML" clean configure build run test
+
 builder_parse "$@"
 
-# TODO: build if out-of-date if test is specified
-# TODO: configure if npm has not been run, and build is specified
+builder_describe_internal_dependency \
+  run:project    build:project \
+  test:project   run:project
 
+builder_describe_outputs \
+  configure "/node_modules" \
+  build     "/core/include/ldml/ldml-const-builder/ldml-const-builder.js" \
+  run       "/core/include/ldml/ldml-const-builder/run.txt"
 
-if builder_start_action clean; then
-  rm -rf ../../include/ldml/build/
-  # Not removing ${CORE_LDML_H_FILE} as it is checked in
-  builder_finish_action success clean
-fi
-
-if builder_start_action build; then
-  # Generate index.ts
-  npx tsc -b ../../include/ldml/tsconfig.build.json
-
-  builder_finish_action success build
-fi
-
-if builder_start_action run; then
+function do_run() {
   node --enable-source-maps ../../include/ldml/ldml-const-builder/ldml-const-builder.js > ${CORE_LDML_H_FILE}
+  touch ../../include/ldml/ldml-const-builder/run.txt
   echo "Updated ${CORE_LDML_H_FILE}"
+}
 
-  builder_finish_action success run
-fi
+function do_test() {
+  if ! git diff --exit-code "${CORE_LDML_H_FILE}"; then
+    builder_echo error "File ${CORE_LDML_TS_FILE} has changed, but /core/tools/ldml-const-builder has not been run."
+    builder_echo error "Run ${COLOR_BRIGHT_WHITE}$KEYMAN_ROOT/core/tools/ldml-const-build/build.sh run${COLOR_RESET} and commit changes"
+    return 1
+  fi
+}
+
+# clean: Not removing ${CORE_LDML_H_FILE} as it is checked in
+builder_run_action clean      rm -rf ../../include/ldml/build/ ../../include/ldml/ldml-const-builder/ ../../include/ldml/coverage/
+builder_run_action configure  node_select_version_and_npm_ci
+builder_run_action build      tsc -b ../../include/ldml/tsconfig.build.json
+builder_run_action run        do_run
+builder_run_action test       do_test
 
diff --git a/docs/builder.md b/docs/builder.md
index 534d8731ea..7820fcdab6 100644
--- a/docs/builder.md
+++ b/docs/builder.md
@@ -1049,13 +1049,13 @@ Do not use builder standard options such as `--deps` or `--debug`.
 
 ### Parameters
 
-* 1: `script`      path to script, relative to root of repo
+* 1: `script`      path to script, relative to root of repo, with leading slash
 * 2+: `parameters` action(s), target(s), parameters for the child script to run
 
 ### Example
 
 ```bash
-  builder_launch core/build.sh configure,build:wasm --no-tests
+  builder_launch /core/build.sh configure,build:wasm --no-tests
 ```
 
 --------------------------------------------------------------------------------
diff --git a/resources/builder.inc.sh b/resources/builder.inc.sh
index 0ce80a5c2d..125a8ae333 100755
--- a/resources/builder.inc.sh
+++ b/resources/builder.inc.sh
@@ -448,13 +448,13 @@ _builder_cleanup_deps() {
 #
 # ### Parameters
 #
-# * 1: `script`      path to script, relative to root of repo
+# * 1: `script`      path to script, relative to root of repo, with leading slash
 # * 2+: `parameters` action(s), target(s), parameters for the child script to run
 #
 # ### Example
 #
 # ```bash
-#   builder_launch core/build.sh configure,build:wasm --no-tests
+#   builder_launch /core/build.sh configure,build:wasm --no-tests
 # ```
 #
 builder_launch() {
diff --git a/resources/teamcity/common/common-test-core.sh b/resources/teamcity/common/common-test-core.sh
index 6d061ec4c0..7b838182fa 100755
--- a/resources/teamcity/common/common-test-core.sh
+++ b/resources/teamcity/common/common-test-core.sh
@@ -34,7 +34,8 @@ else
 fi
 
 function do_all() {
-  "${KEYMAN_ROOT}/core/build.sh" configure,build,test:${ARCH}
+  builder_launch /core/tools/ldml-const-builder/build.sh clean,configure,build,run,test
+  builder_launch /core/build.sh configure,build,test:${ARCH}
 }
 
 builder_run_action  all  do_all