diff --git a/docs/python-extension.md b/docs/python-extension.md
index 7cfe6644..523323a9 100644
--- a/docs/python-extension.md
+++ b/docs/python-extension.md
@@ -21,6 +21,13 @@ available there.
 | Target | `python` |
 | IR versions | `3`, `4` |
 | MEP version | `0.1` |
+| Multiple source documents | `multiDocument: true`, from `0.4.2` |
+
+Extension `0.4.2` pairs with `morphir-python==0.1.0` and
+`morphir-python-native==0.1.1`, qualified with `morphir==0.1.0`.
+The native API reports compiler version `0.4.2`.
+Use `0.4.2` or later with hosts that require an explicit multi-document claim;
+`0.4.1` omits that claim.
 
 The declaration is in [`rust/extension.toml`](../rust/extension.toml).
 
diff --git a/packages/morphir-tools/README.md b/packages/morphir-tools/README.md
index de82c229..8131ba3b 100644
--- a/packages/morphir-tools/README.md
+++ b/packages/morphir-tools/README.md
@@ -63,7 +63,7 @@ format-version rules and the draft v4 status.
 ## Requirements
 
 - Python 3.14+
-- `morphir>=0.0.2` and `morphir-python-native==0.1.0` (installed as dependencies)
+- `morphir>=0.1.0` and `morphir-python-native==0.1.1` (installed as dependencies)
 
 ## License
 
diff --git a/packages/morphir-tools/pyproject.toml b/packages/morphir-tools/pyproject.toml
index 0a894cd8..b9892451 100644
--- a/packages/morphir-tools/pyproject.toml
+++ b/packages/morphir-tools/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "morphir-python"
-version = "0.0.3"
+version = "0.1.0"
 description = "CLI tools and extensions for Morphir Python"
 readme = "README.md"
 license = "Apache-2.0"
@@ -22,9 +22,9 @@ authors = [
     { name = "FINOS", email = "morphir@finos.org" }
 ]
 dependencies = [
-    "morphir>=0.0.2",
+    "morphir>=0.1.0",
     # Exact qualified native compiler; checked again when the compiler first loads.
-    "morphir-python-native==0.1.0",
+    "morphir-python-native==0.1.1",
     "typer>=0.15",
     # Rich uses Pygments; older versions are affected by CVE-2026-4539.
     "pygments>=2.20.0",
diff --git a/packages/morphir-tools/src/morphir_tools/__init__.py b/packages/morphir-tools/src/morphir_tools/__init__.py
index 993831fc..22222dd3 100644
--- a/packages/morphir-tools/src/morphir_tools/__init__.py
+++ b/packages/morphir-tools/src/morphir_tools/__init__.py
@@ -6,8 +6,8 @@
 Example:
     >>> import morphir_tools
     >>> morphir_tools.__version__
-    '0.0.3'
+    '0.1.0'
 """
 
-__version__ = "0.0.3"
+__version__ = "0.1.0"
 __all__ = ["__version__"]
diff --git a/packages/morphir-tools/src/morphir_tools/python/_bridge.py b/packages/morphir-tools/src/morphir_tools/python/_bridge.py
index 8d151a4c..e23a4bd1 100644
--- a/packages/morphir-tools/src/morphir_tools/python/_bridge.py
+++ b/packages/morphir-tools/src/morphir_tools/python/_bridge.py
@@ -8,7 +8,7 @@
 
 from ._types import NativeCompilerInfo, NativeCompilerUnavailable
 
-EXPECTED_NATIVE_VERSION = "0.1.0"
+EXPECTED_NATIVE_VERSION = "0.1.1"
 """The exact ``morphir-python-native`` version this release was qualified with.
 
 It must equal the pin in this distribution's ``pyproject.toml``.
diff --git a/packages/morphir/pyproject.toml b/packages/morphir/pyproject.toml
index 11b120be..911bc14d 100644
--- a/packages/morphir/pyproject.toml
+++ b/packages/morphir/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "morphir"
-version = "0.0.2"
+version = "0.1.0"
 description = "Python port of Morphir - functional domain modeling for the enterprise"
 readme = "README.md"
 license = "Apache-2.0"
diff --git a/packages/morphir/src/morphir/__init__.py b/packages/morphir/src/morphir/__init__.py
index 9f166001..8074c7d1 100644
--- a/packages/morphir/src/morphir/__init__.py
+++ b/packages/morphir/src/morphir/__init__.py
@@ -7,8 +7,8 @@
 Example:
     >>> import morphir
     >>> morphir.__version__
-    '0.0.2'
+    '0.1.0'
 """
 
-__version__ = "0.0.2"
+__version__ = "0.1.0"
 __all__ = ["__version__"]
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 75938590..450204fc 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -1460,7 +1460,7 @@ dependencies = [
 
 [[package]]
 name = "morphir-python-binding"
-version = "0.4.1"
+version = "0.4.2"
 dependencies = [
  "cucumber",
  "morphir-core",
@@ -1477,7 +1477,7 @@ dependencies = [
 
 [[package]]
 name = "morphir-python-native"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "morphir-extension-sdk",
  "morphir-python-binding",
diff --git a/rust/crates/morphir-python-binding/Cargo.toml b/rust/crates/morphir-python-binding/Cargo.toml
index c9bc3b9a..81ff6904 100644
--- a/rust/crates/morphir-python-binding/Cargo.toml
+++ b/rust/crates/morphir-python-binding/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "morphir-python-binding"
-version = "0.4.1"
+version = "0.4.2"
 edition.workspace = true
 rust-version.workspace = true
 authors.workspace = true
diff --git a/rust/crates/morphir-python-binding/src/lib.rs b/rust/crates/morphir-python-binding/src/lib.rs
index 3c8da561..77c08d98 100644
--- a/rust/crates/morphir-python-binding/src/lib.rs
+++ b/rust/crates/morphir-python-binding/src/lib.rs
@@ -58,6 +58,7 @@ impl Extension for PythonExtension {
                 }],
                 ir_versions: vec!["3".into(), "4".into()],
                 compile: true,
+                multi_document: true,
                 ..Default::default()
             }),
             backend: Some(BackendCapability {
diff --git a/rust/crates/morphir-python-binding/tests/ir_versions.rs b/rust/crates/morphir-python-binding/tests/ir_versions.rs
index 3054a881..ce1c2f1f 100644
--- a/rust/crates/morphir-python-binding/tests/ir_versions.rs
+++ b/rust/crates/morphir-python-binding/tests/ir_versions.rs
@@ -65,8 +65,15 @@ fn generate(ir: Value) -> GenerateResult {
 
 #[test]
 fn both_versions_preserve_imports_privacy_tuples_and_conditionals() {
+    assert!(
+        PythonExtension::capabilities()
+            .frontend
+            .unwrap()
+            .multi_document
+    );
     for version in ["3", "3.0.0", "4", "4.0.0"] {
         let mut request = a_request(version);
+        assert_eq!(request.sources.documents.len(), 2);
         let ir = compile(request.clone());
         if version.starts_with('3') {
             let decoded: classic::Distribution = serde_json::from_value(ir.clone()).unwrap();
diff --git a/rust/crates/morphir-python-binding/tests/pipeline.rs b/rust/crates/morphir-python-binding/tests/pipeline.rs
index c464cb1d..41a1dc8a 100644
--- a/rust/crates/morphir-python-binding/tests/pipeline.rs
+++ b/rust/crates/morphir-python-binding/tests/pipeline.rs
@@ -107,6 +107,11 @@ fn rejects_unsupported_or_ambiguous_source_without_partial_ir() {
 #[test]
 fn advertises_and_enforces_the_initial_contract() {
     let capabilities = PythonExtension::capabilities();
+    assert!(capabilities.frontend.as_ref().unwrap().multi_document);
+    assert_eq!(
+        serde_json::to_value(&capabilities).unwrap()["frontend"]["multiDocument"],
+        json!(true)
+    );
     assert_eq!(capabilities.frontend.unwrap().ir_versions, ["3", "4"]);
     assert_eq!(capabilities.backend.unwrap().targets, ["python"]);
     let mut request = a_request("");
diff --git a/rust/crates/morphir-python-binding/tests/support/native.rs b/rust/crates/morphir-python-binding/tests/support/native.rs
index 762d5a0c..cdcd69ee 100644
--- a/rust/crates/morphir-python-binding/tests/support/native.rs
+++ b/rust/crates/morphir-python-binding/tests/support/native.rs
@@ -1,7 +1,7 @@
 //! Native protocol fixture with a completed initialization handshake.
 
 use morphir_extension_sdk::{
-    NativeExtension,
+    Extension, NativeExtension,
     protocol::{ExtensionRequest, InitializeParams, MEP_VERSION, PeerInfo, methods},
 };
 use morphir_python_binding::PythonExtension;
@@ -25,5 +25,13 @@ pub fn an_initialized_extension() -> NativeExtension {
         .unwrap(),
     );
     assert!(response.error.is_none(), "{:?}", response.error);
+    let expected = serde_json::to_value(PythonExtension::capabilities()).unwrap();
+    assert_eq!(expected["frontend"]["multiDocument"], true);
+    assert_eq!(response.result.unwrap()["capabilities"], expected);
+    let response = extension
+        .protocol()
+        .handle(ExtensionRequest::new(methods::CAPABILITIES, serde_json::json!({}), 1).unwrap());
+    assert!(response.error.is_none(), "{:?}", response.error);
+    assert_eq!(response.result.unwrap(), expected);
     extension
 }
diff --git a/rust/crates/morphir-python-native/Cargo.toml b/rust/crates/morphir-python-native/Cargo.toml
index 488d1080..c6b9735d 100644
--- a/rust/crates/morphir-python-native/Cargo.toml
+++ b/rust/crates/morphir-python-native/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "morphir-python-native"
-version = "0.1.0"
+version = "0.1.1"
 edition.workspace = true
 rust-version.workspace = true
 authors.workspace = true
diff --git a/scripts/extension_bundle.py b/scripts/extension_bundle.py
index 8d057534..560aac84 100644
--- a/scripts/extension_bundle.py
+++ b/scripts/extension_bundle.py
@@ -198,6 +198,7 @@ def receipt(bundle: Path) -> dict[str, object]:
     if not (
         isinstance(frontend, dict)
         and frontend.get("compile") is True
+        and frontend.get("multiDocument") is True
         and frontend.get("irVersions") == extension["ir_versions"]
         and isinstance(backend, dict)
         and backend.get("generate") is True
@@ -212,6 +213,7 @@ def receipt(bundle: Path) -> dict[str, object]:
         "git_commit": descriptor.get("gitCommit"),
         "packager_rev": declaration()["packager"]["rev"],
         "capabilities": sorted(k for k, v in capabilities.items() if v),
+        "multiDocument": frontend["multiDocument"],
     }
 
 
@@ -258,6 +260,8 @@ def morphir_cli() -> tuple[Path, str]:
 
 def host_check(bundle: Path) -> dict[str, object]:
     """Install the bundle with the pinned CLI and round trip offline."""
+    from morphir_tools.python import native_compiler
+
     bundle = bundle.resolve()
     described = receipt(bundle)
     cli, cli_digest = morphir_cli()
@@ -335,6 +339,10 @@ def morphir(*args: str, offline: bool = False) -> str:
     return {
         **described,
         "host": {"morphir": declaration()["host"]["version"], "sha256": cli_digest},
+        "python_api": {
+            "native_version": native_compiler().version,
+            "compiler_version": native_compiler().compiler_version,
+        },
         "offline_round_trips": results,
     }
 
@@ -348,8 +356,15 @@ def agrees_with_api(document: dict[str, Any], tag: str) -> bool:
         IrVersion,
         SourceDocument,
         compile_sources,
+        native_compiler,
     )
 
+    compiler = native_compiler()
+    if compiler.compiler_version != crate_version():
+        raise BundleError(
+            f"API compiler {compiler.compiler_version} differs from "
+            f"bundle {crate_version()}"
+        )
     sources = [
         SourceDocument(p.relative_to(SAMPLE).as_posix(), p.read_text())
         for p in sorted(SAMPLE.rglob("*.py"))
diff --git a/tests/conftest.py b/tests/conftest.py
index 0ac7ca8b..f95a2880 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -6,4 +6,4 @@
 @pytest.fixture
 def sample_version() -> str:
     """Provide the expected version string for tests."""
-    return "0.0.2"
+    return "0.1.0"
diff --git a/tests/tools/test_tools.py b/tests/tools/test_tools.py
index 19dcf3bd..d672818f 100644
--- a/tests/tools/test_tools.py
+++ b/tests/tools/test_tools.py
@@ -14,7 +14,7 @@ def test_version_is_defined(self) -> None:
 
     def test_version_matches_expected(self) -> None:
         """The version should match the expected value."""
-        assert morphir_tools.__version__ == "0.0.3"
+        assert morphir_tools.__version__ == "0.1.0"
 
     def test_installed_distribution_name(self) -> None:
         """The tools import belongs to the morphir-python distribution."""
@@ -32,7 +32,7 @@ def test_installed_console_command(self) -> None:
     def test_cli_requires_separate_core(self) -> None:
         """The CLI must install the independent library and SDK distribution."""
         requirements = distribution("morphir-python").requires or []
-        assert "morphir>=0.0.2" in requirements
+        assert "morphir>=0.1.0" in requirements
 
     def test_version_is_string(self) -> None:
         """The version should be a string."""
diff --git a/tests/unit/test_extension_bundle.py b/tests/unit/test_extension_bundle.py
new file mode 100644
index 00000000..c4d81cee
--- /dev/null
+++ b/tests/unit/test_extension_bundle.py
@@ -0,0 +1,53 @@
+"""Require explicit multi-document claims in Python release bundles."""
+
+from __future__ import annotations
+
+import json
+from typing import TYPE_CHECKING
+
+import pytest
+
+from scripts import extension_bundle as bundle
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+
+@pytest.mark.parametrize("multi_document", [None, False, True])
+def test_bundle_requires_multi_document_claim(
+    tmp_path: Path, multi_document: bool | None
+) -> None:
+    version = bundle.crate_version()
+    artifact = f"morphir-python-binding-{version}.wasm"
+    wasm = b"qualification fixture"
+    digest = bundle.sha256(wasm)
+    (tmp_path / artifact).write_bytes(wasm)
+    (tmp_path / f"{artifact}.sha256").write_text(f"{digest}  {artifact}\n")
+    frontend: dict[str, object] = {"compile": True, "irVersions": ["3", "4"]}
+    if multi_document is not None:
+        frontend["multiDocument"] = multi_document
+    (tmp_path / "release.json").write_text(
+        json.dumps(
+            {
+                "extensionId": "morphir-python",
+                "version": version,
+                "artifacts": [
+                    {
+                        "sha256": digest,
+                        "claims": {
+                            "extension": {"id": "morphir-python", "version": version},
+                            "capabilities": {
+                                "frontend": frontend,
+                                "backend": {"generate": True, "targets": ["python"]},
+                            },
+                        },
+                    }
+                ],
+            }
+        )
+    )
+    if multi_document is True:
+        assert bundle.receipt(tmp_path)["multiDocument"] is True
+    else:
+        with pytest.raises(bundle.BundleError, match="claims lack"):
+            bundle.receipt(tmp_path)
diff --git a/uv.lock b/uv.lock
index ac82decb..3d9732bb 100644
--- a/uv.lock
+++ b/uv.lock
@@ -196,12 +196,12 @@ wheels = [
 
 [[package]]
 name = "morphir"
-version = "0.0.2"
+version = "0.1.0"
 source = { editable = "packages/morphir" }
 
 [[package]]
 name = "morphir-python"
-version = "0.0.3"
+version = "0.1.0"
 source = { editable = "packages/morphir-tools" }
 dependencies = [
     { name = "morphir" },