diff --git a/contributing-docs/30_new_language_sdk.rst b/contributing-docs/30_new_language_sdk.rst
index 180a3e6539c0a..80fbe9e4235cb 100644
--- a/contributing-docs/30_new_language_sdk.rst
+++ b/contributing-docs/30_new_language_sdk.rst
@@ -409,6 +409,11 @@ authored in the target language. An SDK declares each one independently.
     The SDK can execute a task declared in a Python Dag with the ``@task.stub``
     decorator. This is the primary execution path for every Language SDK.
 
+``taskflow-binding`` (MUST)
+    Arguments bound to a ``@task.stub`` target in the Python TaskFlow Dag — literal values
+    and upstream XCom results alike — are delivered to the task function's parameters at
+    runtime.
+
 ``task-logging`` (MUST)
     The SDK forwards the task's log output — stdout / stderr and any structured log
     records — to the supervisor over the ``--logs`` socket, so it surfaces in the task
diff --git a/go-sdk/README.md b/go-sdk/README.md
index a5d619025f644..d4e0172f1e9e0 100644
--- a/go-sdk/README.md
+++ b/go-sdk/README.md
@@ -302,6 +302,7 @@ prek hook regenerate it.
 | state: `removed` | MAY | ✓ | 3.3 |  |
 | **Runtime capabilities** |  |  |  |  |
 | capability: `mixed-lang-stub-target` | MUST | ✓ | 3.3 | @task.stub |
+| capability: `taskflow-binding` | MUST | ✗ | – | bind @task.stub literal/XCom args to the native handler |
 | capability: `task-logging` | MUST | ✓ | 3.3 | slog records streamed over the logs socket |
 | capability: `xcom-read-write` | MUST | ✓ | 3.3 | PushXCom / GetXCom |
 | capability: `connection-read` | MUST | ✓ | 3.3 | GetConnection |
diff --git a/go-sdk/capabilities.yaml b/go-sdk/capabilities.yaml
index 94be96e9639dd..a0715aef9edcb 100644
--- a/go-sdk/capabilities.yaml
+++ b/go-sdk/capabilities.yaml
@@ -59,6 +59,9 @@ capabilities:
     supported: true
     since: "3.3"
     note: "@task.stub"
+  taskflow-binding:
+    supported: false
+    note: "bind @task.stub literal/XCom args to the native handler"
   task-logging:
     supported: true
     since: "3.3"
diff --git a/java-sdk/README.md b/java-sdk/README.md
index 372426e31dc86..027babb6eedf3 100644
--- a/java-sdk/README.md
+++ b/java-sdk/README.md
@@ -605,6 +605,7 @@ prek hook regenerate it.
 | state: `removed` | MAY | ✓ | 3.3 |  |
 | **Runtime capabilities** |  |  |  |  |
 | capability: `mixed-lang-stub-target` | MUST | ✓ | 3.3 | @task.stub |
+| capability: `taskflow-binding` | MUST | ✗ | – | bind @task.stub literal/XCom args to the native handler |
 | capability: `task-logging` | MUST | ✓ | 3.3 | SLF4J + JPL bridged to the task log |
 | capability: `xcom-read-write` | MUST | ✓ | 3.3 |  |
 | capability: `connection-read` | MUST | ✓ | 3.3 |  |
diff --git a/java-sdk/capabilities.yaml b/java-sdk/capabilities.yaml
index 50dc38c952886..45724e433bda1 100644
--- a/java-sdk/capabilities.yaml
+++ b/java-sdk/capabilities.yaml
@@ -59,6 +59,9 @@ capabilities:
     supported: true
     since: "3.3"
     note: "@task.stub"
+  taskflow-binding:
+    supported: false
+    note: "bind @task.stub literal/XCom args to the native handler"
   task-logging:
     supported: true
     since: "3.3"
diff --git a/java-sdk/sdk/module.md b/java-sdk/sdk/module.md
index fd402bb048bcf..9e1c86d895c7a 100644
--- a/java-sdk/sdk/module.md
+++ b/java-sdk/sdk/module.md
@@ -44,6 +44,7 @@ meaning of each dimension is defined in the
 | state: `removed` | MAY | ✓ | 3.3 |  |
 | **Runtime capabilities** |  |  |  |  |
 | capability: `mixed-lang-stub-target` | MUST | ✓ | 3.3 | @task.stub |
+| capability: `taskflow-binding` | MUST | ✗ | – | bind @task.stub literal/XCom args to the native handler |
 | capability: `task-logging` | MUST | ✓ | 3.3 | SLF4J + JPL bridged to the task log |
 | capability: `xcom-read-write` | MUST | ✓ | 3.3 |  |
 | capability: `connection-read` | MUST | ✓ | 3.3 |  |
diff --git a/scripts/ci/prek/lang_sdk_compat_matrix.py b/scripts/ci/prek/lang_sdk_compat_matrix.py
index 9c8dd3ca92ac4..c9003354c5668 100644
--- a/scripts/ci/prek/lang_sdk_compat_matrix.py
+++ b/scripts/ci/prek/lang_sdk_compat_matrix.py
@@ -77,6 +77,7 @@ class Capability(NamedTuple):
 # whole Dag in the target language and are gated by NATIVE_DAG_GATE (except the gate itself).
 CAPABILITY_DIMENSIONS: list[Capability] = [
     Capability("mixed-lang-stub-target", "MUST", "runtime", False),
+    Capability("taskflow-binding", "MUST", "runtime", False),
     Capability("task-logging", "MUST", "runtime", False),
     Capability("xcom-read-write", "MUST", "runtime", False),
     Capability("connection-read", "MUST", "runtime", False),
diff --git a/ts-sdk/README.md b/ts-sdk/README.md
index c5f6021033712..6e4c44079da40 100644
--- a/ts-sdk/README.md
+++ b/ts-sdk/README.md
@@ -245,6 +245,7 @@ Do not edit the table by hand. Update the manifest and run the `update-ts-sdk-re
 | state: `removed` | MAY | ✓ | 3.4 |  |
 | **Runtime capabilities** |  |  |  |  |
 | capability: `mixed-lang-stub-target` | MUST | ✓ | 3.4 | @task.stub |
+| capability: `taskflow-binding` | MUST | ✗ | – | bind @task.stub literal/XCom args to the native handler |
 | capability: `task-logging` | MUST | ✓ | 3.4 | structured records over the log socket |
 | capability: `xcom-read-write` | MUST | ✓ | 3.4 | getXCom / setXCom |
 | capability: `connection-read` | MUST | ✓ | 3.4 | getConnection |
diff --git a/ts-sdk/capabilities.yaml b/ts-sdk/capabilities.yaml
index 4972a07fa1188..65482fc8f4bb8 100644
--- a/ts-sdk/capabilities.yaml
+++ b/ts-sdk/capabilities.yaml
@@ -59,6 +59,9 @@ capabilities:
     supported: true
     since: "3.4"
     note: "@task.stub"
+  taskflow-binding:
+    supported: false
+    note: "bind @task.stub literal/XCom args to the native handler"
   task-logging:
     supported: true
     since: "3.4"