diff --git a/tests/include/test/psa_test_wrappers.h b/tests/include/test/psa_test_wrappers.h
index 7ab2bea..4d674e7 100644
--- a/tests/include/test/psa_test_wrappers.h
+++ b/tests/include/test/psa_test_wrappers.h
@@ -475,13 +475,13 @@
 
 psa_status_t mbedtls_test_wrap_psa_key_agreement_iop_complete(
     psa_key_agreement_iop_t *arg0_operation,
-    psa_key_id_t *arg1_key);
+    mbedtls_svc_key_id_t *arg1_key);
 #define psa_key_agreement_iop_complete(arg0_operation, arg1_key) \
     mbedtls_test_wrap_psa_key_agreement_iop_complete(arg0_operation, arg1_key)
 
 psa_status_t mbedtls_test_wrap_psa_key_agreement_iop_setup(
     psa_key_agreement_iop_t *arg0_operation,
-    psa_key_id_t arg1_private_key,
+    mbedtls_svc_key_id_t arg1_private_key,
     const uint8_t *arg2_peer_key,
     size_t arg3_peer_key_length,
     psa_algorithm_t arg4_alg,
diff --git a/tests/psa-client-server/psasim/src/psa_sim_serialise.c b/tests/psa-client-server/psasim/src/psa_sim_serialise.c
index e5c7225..44d87d6 100644
--- a/tests/psa-client-server/psasim/src/psa_sim_serialise.c
+++ b/tests/psa-client-server/psasim/src/psa_sim_serialise.c
@@ -1624,6 +1624,42 @@
     return 1;
 }
 
+size_t psasim_serialise_psa_key_agreement_iop_t_needs(
+    psa_key_agreement_iop_t value)
+{
+    return sizeof(value);
+}
+
+int psasim_serialise_psa_key_agreement_iop_t(uint8_t **pos,
+                                             size_t *remaining,
+                                             psa_key_agreement_iop_t value)
+{
+    if (*remaining < sizeof(value)) {
+        return 0;
+    }
+
+    memcpy(*pos, &value, sizeof(value));
+    *pos += sizeof(value);
+
+    return 1;
+}
+
+int psasim_deserialise_psa_key_agreement_iop_t(uint8_t **pos,
+                                               size_t *remaining,
+                                               psa_key_agreement_iop_t *value)
+{
+    if (*remaining < sizeof(*value)) {
+        return 0;
+    }
+
+    memcpy(value, *pos, sizeof(*value));
+
+    *pos += sizeof(*value);
+    *remaining -= sizeof(*value);
+
+    return 1;
+}
+
 void psa_sim_serialize_reset(void)
 {
     memset(hash_operation_handles, 0,
diff --git a/tests/psa-client-server/psasim/src/psa_sim_serialise.h b/tests/psa-client-server/psasim/src/psa_sim_serialise.h
index 523ce80..02f6bcb 100644
--- a/tests/psa-client-server/psasim/src/psa_sim_serialise.h
+++ b/tests/psa-client-server/psasim/src/psa_sim_serialise.h
@@ -1301,3 +1301,46 @@
 int psasim_deserialise_mbedtls_svc_key_id_t(uint8_t **pos,
                                             size_t *remaining,
                                             mbedtls_svc_key_id_t *value);
+
+/** Return how much buffer space is needed by \c psasim_serialise_psa_key_agreement_iop_t()
+ *  to serialise a `psa_key_agreement_iop_t`.
+ *
+ * \param value              The value that will be serialised into the buffer
+ *                           (needed in case some serialisations are value-
+ *                           dependent).
+ *
+ * \return                   The number of bytes needed in the buffer by
+ *                           \c psasim_serialise_psa_key_agreement_iop_t() to serialise
+ *                           the given value.
+ */
+size_t psasim_serialise_psa_key_agreement_iop_t_needs(
+    psa_key_agreement_iop_t value);
+
+/** Serialise a `psa_key_agreement_iop_t` into a buffer.
+ *
+ * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
+ *                           in the buffer.
+ * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
+ *                           remaining in the buffer.
+ * \param value              The value to serialise into the buffer.
+ *
+ * \return                   \c 1 on success ("okay"), \c 0 on error.
+ */
+int psasim_serialise_psa_key_agreement_iop_t(uint8_t **pos,
+                                             size_t *remaining,
+                                             psa_key_agreement_iop_t value);
+
+/** Deserialise a `psa_key_agreement_iop_t` from a buffer.
+ *
+ * \param pos[in,out]        Pointer to a `uint8_t *` holding current position
+ *                           in the buffer.
+ * \param remaining[in,out]  Pointer to a `size_t` holding number of bytes
+ *                           remaining in the buffer.
+ * \param value              Pointer to a `psa_key_agreement_iop_t` to receive the value
+ *                           deserialised from the buffer.
+ *
+ * \return                   \c 1 on success ("okay"), \c 0 on error.
+ */
+int psasim_deserialise_psa_key_agreement_iop_t(uint8_t **pos,
+                                               size_t *remaining,
+                                               psa_key_agreement_iop_t *value);
diff --git a/tests/psa-client-server/psasim/src/psa_sim_serialise.pl b/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
index 31c93ae..054841e 100755
--- a/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
+++ b/tests/psa-client-server/psasim/src/psa_sim_serialise.pl
@@ -48,7 +48,8 @@
                psa_key_derivation_operation_t
                psa_sign_hash_interruptible_operation_t
                psa_verify_hash_interruptible_operation_t
-               mbedtls_svc_key_id_t);
+               mbedtls_svc_key_id_t
+               psa_key_agreement_iop_t);
 
 grep(s/-/ /g, @types);
 
diff --git a/tests/src/psa_test_wrappers.c b/tests/src/psa_test_wrappers.c
index 6e42a8b..1277df0 100644
--- a/tests/src/psa_test_wrappers.c
+++ b/tests/src/psa_test_wrappers.c
@@ -835,7 +835,7 @@
 /* Wrapper for psa_key_agreement_iop_complete */
 psa_status_t mbedtls_test_wrap_psa_key_agreement_iop_complete(
     psa_key_agreement_iop_t *arg0_operation,
-    psa_key_id_t *arg1_key)
+    mbedtls_svc_key_id_t *arg1_key)
 {
     psa_status_t status = (psa_key_agreement_iop_complete)(arg0_operation, arg1_key);
     return status;
@@ -844,7 +844,7 @@
 /* Wrapper for psa_key_agreement_iop_setup */
 psa_status_t mbedtls_test_wrap_psa_key_agreement_iop_setup(
     psa_key_agreement_iop_t *arg0_operation,
-    psa_key_id_t arg1_private_key,
+    mbedtls_svc_key_id_t arg1_private_key,
     const uint8_t *arg2_peer_key,
     size_t arg3_peer_key_length,
     psa_algorithm_t arg4_alg,