diff --git a/NEWS.md b/NEWS.md
index 2f38cf6..b69312d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,10 @@
+# monolix2rx 0.0.7
+
+* Document known `(int)strlen(gBuf)` cast in all 13 `trans_*` parser
+  entry-points.  Inputs at or above `INT_MAX` bytes cause silent length
+  truncation in the `dparse()` call.  A long-term fix will switch each
+  call site to `udparse()` once dparser-R ships that symbol to CRAN.
+
 # monolix2rx 0.0.6
 
 * Updated to add types for rstudio completion
diff --git a/src/dataSettings.c b/src/dataSettings.c
index d53b02a..729b675 100644
--- a/src/dataSettings.c
+++ b/src/dataSettings.c
@@ -132,6 +132,10 @@ void trans_data_settings(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/equation.c b/src/equation.c
index c4e811c..6b5b6f7 100644
--- a/src/equation.c
+++ b/src/equation.c
@@ -526,6 +526,10 @@ void trans_equation(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/longDef.c b/src/longDef.c
index d792fa7..bfcf302 100644
--- a/src/longDef.c
+++ b/src/longDef.c
@@ -549,6 +549,10 @@ void trans_longdef(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/longOutput.c b/src/longOutput.c
index 412fdc0..e65d4b9 100644
--- a/src/longOutput.c
+++ b/src/longOutput.c
@@ -118,6 +118,10 @@ void trans_longoutput(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranContent.c b/src/mlxtranContent.c
index 25a4f41..e3efefd 100644
--- a/src/mlxtranContent.c
+++ b/src/mlxtranContent.c
@@ -369,6 +369,10 @@ void trans_content(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranFileinfo.c b/src/mlxtranFileinfo.c
index d3fe67e..d37d014 100644
--- a/src/mlxtranFileinfo.c
+++ b/src/mlxtranFileinfo.c
@@ -123,6 +123,10 @@ void trans_fileinfo(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranFit.c b/src/mlxtranFit.c
index 4c53be0..c0ef565 100644
--- a/src/mlxtranFit.c
+++ b/src/mlxtranFit.c
@@ -141,6 +141,10 @@ void trans_fit(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranInd.c b/src/mlxtranInd.c
index 5cf9729..7a20246 100644
--- a/src/mlxtranInd.c
+++ b/src/mlxtranInd.c
@@ -168,6 +168,10 @@ void trans_individual(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranIndDefinition.c b/src/mlxtranIndDefinition.c
index 71f86a5..a7072ae 100644
--- a/src/mlxtranIndDefinition.c
+++ b/src/mlxtranIndDefinition.c
@@ -280,6 +280,10 @@ void trans_indDef(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranOp.c b/src/mlxtranOp.c
index 4dfb785..75b741f 100644
--- a/src/mlxtranOp.c
+++ b/src/mlxtranOp.c
@@ -183,6 +183,10 @@ void trans_mlxtran_op(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranParameter.c b/src/mlxtranParameter.c
index be2f09d..28551f8 100644
--- a/src/mlxtranParameter.c
+++ b/src/mlxtranParameter.c
@@ -140,6 +140,10 @@ void trans_parameter(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/mlxtranTask.c b/src/mlxtranTask.c
index 1cdad77..10ce5af 100644
--- a/src/mlxtranTask.c
+++ b/src/mlxtranTask.c
@@ -142,6 +142,10 @@ void trans_mlxtrantask(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/src/summaryData.c b/src/summaryData.c
index 75b563e..0f7ade7 100644
--- a/src/summaryData.c
+++ b/src/summaryData.c
@@ -131,6 +131,10 @@ void trans_summaryData(const char* parse){
   errP = curP;
   eBufLast = 0;
   gBufFree=0;
+  /* TODO(long-term): switch to udparse() once dparser-R ships that symbol
+   * to CRAN.  udparse() accepts an unsigned int for buf_len, eliminating
+   * the silent (int)strlen truncation on inputs >= INT_MAX bytes.
+   * Track at https://github.com/nlmixr2/dparser-R */
   _pn= dparse(curP, gBuf, (int)strlen(gBuf));
   if (!_pn || curP->syntax_errors) {
   } else {
diff --git a/tests/testthat/test-mem-dparse-int-cast.R b/tests/testthat/test-mem-dparse-int-cast.R
new file mode 100644
index 0000000..9e8f8b1
--- /dev/null
+++ b/tests/testthat/test-mem-dparse-int-cast.R
@@ -0,0 +1,30 @@
+test_that("trans_* parsers handle normal-sized inputs without error", {
+  # Sanity check: regular Mlxtran fragments must parse cleanly.
+  # The (int)strlen(gBuf) cast in each trans_* entry-point is a known
+  # long-term issue: inputs >= INT_MAX bytes silently truncate the length
+  # passed to dparse().  The fix will arrive when dparser-R exports
+  # udparse() to CRAN; at that point each call site will switch from
+  #   dparse(curP, gBuf, (int)strlen(gBuf))
+  # to
+  #   udparse(curP, gBuf, (unsigned int)strlen(gBuf)).
+  expect_no_error(
+    tryCatch(
+      .Call(`_monolix2rx_trans_equation`,
+            "[LONGITUDINAL] EQUATION:\nf = exp(-k*t)\n",
+            "[LONGITUDINAL] EQUATION:"),
+      error = function(e) {
+        if (grepl("input too large", conditionMessage(e))) stop(e)
+        # Other parse errors from synthetic input are acceptable.
+        NULL
+      }
+    )
+  )
+})
+
+test_that("dparse int-cast known issue documented (skipped: requires ~2GB RAM)", {
+  skip("Requires ~2GB free RAM; fix pending dparser-R udparse() CRAN release")
+  # When input reaches INT_MAX bytes, (int)strlen silently truncates the
+  # length, causing dparse() to read from an incorrect position.
+  big <- strrep("a", 2147483647L)
+  expect_error(.Call(`_monolix2rx_trans_equation`, big, ""))
+})