diff --git a/pyproject.toml b/pyproject.toml
index 17cfc50dba..6d7626d79b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -111,7 +111,7 @@ docs = [
 # of the default groups so no other environment installs the client (or the
 # legacy httpx it depends on). See i18n/README.md.
 translate = ["anthropic>=0.121.0"]
-codegen = ["datamodel-code-generator==0.57.0"]
+codegen = ["datamodel-code-generator==0.81.0"]
 
 [build-system]
 requires = ["hatchling", "uv-dynamic-versioning"]
diff --git a/scripts/gen_surface_types.py b/scripts/gen_surface_types.py
index ae41d035cd..d77eedc480 100644
--- a/scripts/gen_surface_types.py
+++ b/scripts/gen_surface_types.py
@@ -195,6 +195,7 @@ def run_codegen(schema_path: Path, output_path: Path) -> None:
             "--snake-case-field", "--remove-special-field-name-prefix",
             "--use-annotated", "--use-field-description", "--use-schema-description",
             "--enum-field-as-literal", "all",
+            "--default-values", '{"ElicitRequestFormParams.mode": "form"}',
             "--use-union-operator", "--use-double-quotes",
             "--use-type-alias", "--skip-root-model",
             "--extra-fields", "ignore",
@@ -252,6 +253,9 @@ def build(entry: dict[str, str]) -> str:
         source = raw.read_text(encoding="utf-8")
 
     source = re.sub(r"\A# generated by datamodel-codegen:\n#[^\n]*\n", "", source)
+    # Explicit __annotations__ hides declared fields under Python 3.14's deferred annotations.
+    source = source.replace('    __annotations__ = {\n        "__pydantic_extra__": Dict[str, Any],\n    }\n', "")
+    source = source.replace(", Dict,", ",")
     # Keep named aliases only for recursive types; other aliases remain ordinary Python types and unions.
     for node in reversed(ast.parse(source).body):
         if not (
diff --git a/tests/types/test_methods.py b/tests/types/test_methods.py
index d38dfa0993..e93346b134 100644
--- a/tests/types/test_methods.py
+++ b/tests/types/test_methods.py
@@ -960,6 +960,19 @@ def test_serialize_server_result_preserves_open_type_extras():
     assert sieved["tools"][0]["_meta"] == nested_meta
 
 
+@pytest.mark.parametrize("input_schema", [{}, {"type": "array"}])
+def test_serialize_server_result_rejects_invalid_tool_input_schema(input_schema: dict[str, Any]) -> None:
+    """The 2026 spec requires a tool's input schema to declare `type="object"`, even though it allows extra keys."""
+    result = {
+        "tools": [{"name": "echo", "inputSchema": input_schema}],
+        "resultType": "complete",
+        "ttlMs": 0,
+        "cacheScope": "private",
+    }
+    with pytest.raises(pydantic.ValidationError):
+        methods.serialize_server_result("tools/list", "2026-07-28", result)
+
+
 def test_serialize_server_result_drops_top_level_server_info_on_discover_but_keeps_the_meta_stamp():
     """Server identity moved from the discover body to result `_meta` (spec PR #3002):
     the sieve drops the removed body key and preserves the `_meta` stamp."""
diff --git a/uv.lock b/uv.lock
index f8dfba03b2..fd2dcb85f9 100644
--- a/uv.lock
+++ b/uv.lock
@@ -6,8 +6,8 @@ resolution-markers = [
     "python_full_version >= '3.15' and sys_platform != 'win32'",
     "python_full_version == '3.14.*' and sys_platform == 'win32'",
     "python_full_version == '3.14.*' and sys_platform != 'win32'",
-    "python_full_version < '3.14' and sys_platform == 'win32'",
     "python_full_version >= '3.12' and python_full_version < '3.14' and sys_platform == 'emscripten'",
+    "python_full_version < '3.14' and sys_platform == 'win32'",
     "(python_full_version < '3.12' and sys_platform == 'emscripten') or (python_full_version < '3.14' and sys_platform != 'emscripten' and sys_platform != 'win32')",
 ]
 
@@ -67,8 +67,7 @@ dependencies = [
     { name = "pydantic", version = "2.12.5", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
     { name = "pydantic", version = "2.14.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
     { name = "sniffio" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/0f/ca/3cb2c20ee729736fbd4546d5d8b67e818288529fe70cb7a80dbf80aef70b/anthropic-0.121.0.tar.gz", hash = "sha256:e79d6e08ab3376602fc9a70d4d5ea3540817c76cf7e16658bed790834e1833d6", size = 1013292, upload-time = "2026-08-07T17:11:07.241Z" }
 wheels = [
@@ -81,7 +80,7 @@ version = "4.14.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "idna" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/61/cc/a381afa6efea9f496eff839d4a6a1aed3bfafc7b3ab4b0d1b243a12573dd/anyio-4.14.2.tar.gz", hash = "sha256:cfa139f3ed1a23ee8f88a145ddb5ac7605b8bbfd8592baacd7ce3d8bb4313c7f", size = 260176, upload-time = "2026-07-12T20:29:07.082Z" }
 wheels = [
@@ -159,8 +158,8 @@ source = { registry = "https://pypi.org/simple" }
 resolution-markers = [
     "python_full_version == '3.14.*' and sys_platform == 'win32'",
     "python_full_version == '3.14.*' and sys_platform != 'win32'",
-    "python_full_version < '3.14' and sys_platform == 'win32'",
     "python_full_version >= '3.12' and python_full_version < '3.14' and sys_platform == 'emscripten'",
+    "python_full_version < '3.14' and sys_platform == 'win32'",
     "(python_full_version < '3.12' and sys_platform == 'emscripten') or (python_full_version < '3.14' and sys_platform != 'emscripten' and sys_platform != 'win32')",
 ]
 dependencies = [
@@ -490,22 +489,23 @@ wheels = [
 
 [[package]]
 name = "datamodel-code-generator"
-version = "0.57.0"
+version = "0.81.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "argcomplete" },
-    { name = "black" },
+    { name = "black", marker = "sys_platform != 'emscripten'" },
     { name = "genson" },
     { name = "inflect" },
-    { name = "isort" },
+    { name = "isort", marker = "sys_platform != 'emscripten'" },
     { name = "jinja2" },
     { name = "pydantic", version = "2.12.5", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
     { name = "pydantic", version = "2.14.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
     { name = "pyyaml" },
+    { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/5d/44/87d5980f813a1e323c5d726b3ac5fec8c915ce8a77fcdceaf9c00457dbae/datamodel_code_generator-0.57.0.tar.gz", hash = "sha256:0eda778ea06eaa476e542a5f1fe1d14cc3bbf686edb33a0ad6151c7d19089906", size = 932941, upload-time = "2026-05-07T16:21:55.819Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/41/a1/87deb406ca27b0ae25cda946940208dfe2a2953b7fef20f8a968746e6b36/datamodel_code_generator-0.81.0.tar.gz", hash = "sha256:3b4d1639cc7430f7e34fddc3827fb5d3eb0a4f5394750890c46ba2a9d56e3ee2", size = 2912162, upload-time = "2026-09-14T00:05:20.43Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c5/c1/4fb9a44bb4a305b860c5a5b1866dcccfac3b76f5f170a9e68fc7733e16d2/datamodel_code_generator-0.57.0-py3-none-any.whl", hash = "sha256:d26bf5defe5154493d0aa5a822b7725332b9e9dd2abccc2f8856052286aa83b5", size = 259343, upload-time = "2026-05-07T16:21:53.823Z" },
+    { url = "https://files.pythonhosted.org/packages/84/30/acea9e8d4c5e7819c10b25581accfa805e5368ec564fc210c8f4c4ffd666/datamodel_code_generator-0.81.0-py3-none-any.whl", hash = "sha256:82ff0c295685065a83c530ce42ec03fc75b7ca01e72083eb8232d68f7637013a", size = 721675, upload-time = "2026-09-14T00:05:18.451Z" },
 ]
 
 [[package]]
@@ -634,15 +634,15 @@ wheels = [
 
 [[package]]
 name = "httpcore2"
-version = "2.10.0"
+version = "2.12.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "h11" },
     { name = "truststore" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/a9/83/a896fc59940fc5a6e2aff3a4be1d92fa890112936803b331cae75a993c34/httpcore2-2.10.0.tar.gz", hash = "sha256:13c0cc3d1919d4f28457f60cd2c2abe04113a8af184ccf1142811beba936f9dc", size = 67427, upload-time = "2026-08-09T09:11:32.123Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/be/ad/f4f0e57345f1870f3e8cb624e058d7eca6e5a27d33bcc3311d9b618734cd/httpcore2-2.12.0.tar.gz", hash = "sha256:9293522bba0aa7c4c8e9e3f040c16575bd8868e155a77fa30c7a9085a5eae648", size = 67548, upload-time = "2026-08-18T13:22:08.211Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/e5/4f/d149104195a35e2853a2fc203a8e3477747e58c80e17dda686dace174383/httpcore2-2.10.0-py3-none-any.whl", hash = "sha256:7df06cfb34070cae4f7c89be69dc1095eca138e9704ceffb98d25c1912ab6f01", size = 83000, upload-time = "2026-08-09T09:11:29.555Z" },
+    { url = "https://files.pythonhosted.org/packages/d2/74/d370e55600d9bcfa0d9794b0166126d49291a3d2b20c268fc98c453a4948/httpcore2-2.12.0-py3-none-any.whl", hash = "sha256:7e04258ce01013d7d615e5b910a3b27fac937d7a95038227e79652b4ba3b4ceb", size = 83074, upload-time = "2026-08-18T13:22:05.854Z" },
 ]
 
 [[package]]
@@ -662,7 +662,7 @@ wheels = [
 
 [[package]]
 name = "httpx2"
-version = "2.10.0"
+version = "2.12.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio", marker = "sys_platform != 'emscripten'" },
@@ -670,11 +670,11 @@ dependencies = [
     { name = "httpx2-jsfetch", marker = "python_full_version >= '3.12' and sys_platform == 'emscripten'" },
     { name = "idna" },
     { name = "truststore", marker = "sys_platform != 'emscripten'" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/bd/3d/f9a8c07a3884f3e5b26205e8436a18b3af61c5d53192c3bea235574dbbec/httpx2-2.10.0.tar.gz", hash = "sha256:8741d7329fe2c7885fc9ceb61c8217acfb87a85f75723714b89ebf7ad7196338", size = 98749, upload-time = "2026-08-09T09:11:33.24Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7f/f8/579a8b51e42e38ee32647df9f08aa25643ae788e275cc625b199829c4671/httpx2-2.12.0.tar.gz", hash = "sha256:7631fe9887a8a2275f4a2540e053aa670fcc50742864a9ae7c66e609fdcf12cf", size = 100040, upload-time = "2026-08-18T13:22:09.086Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/b9/6d/a637d52449d98a6892d9a4dc0262587afdb6a66f201871842dce5a97b1c1/httpx2-2.10.0-py3-none-any.whl", hash = "sha256:5e3194a432701e1cc6f69a8b1b2fa199ef907013fede8d9a09a2c5b7b8141a18", size = 94355, upload-time = "2026-08-09T09:11:30.882Z" },
+    { url = "https://files.pythonhosted.org/packages/c8/95/411ba65569158e862368917aaf56597f3e5fa3b91b0502919638465a08f3/httpx2-2.12.0-py3-none-any.whl", hash = "sha256:cc8b6eecb8661c146b8f89a60e97456ee086e91a784ed31ac450c3a9e613dd36", size = 95427, upload-time = "2026-08-18T13:22:06.834Z" },
 ]
 
 [[package]]
@@ -889,8 +889,7 @@ dependencies = [
     { name = "opentelemetry-sdk" },
     { name = "protobuf" },
     { name = "rich" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/61/fc/21f923243d8c3ca2ebfa97de46970ced734e66ac634c1c35b6abb41300f1/logfire-4.31.0.tar.gz", hash = "sha256:361bfda17c9d70ada5d220211033bae06b871ddac9d5b06978bc0ceca6b8e658", size = 1080609, upload-time = "2026-03-27T19:00:46.339Z" }
 wheels = [
@@ -984,8 +983,7 @@ dependencies = [
     { name = "pywin32", version = "312", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15' and sys_platform == 'win32'" },
     { name = "sse-starlette" },
     { name = "starlette" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
     { name = "typing-inspection", version = "0.4.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
     { name = "typing-inspection", version = "0.4.4", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
     { name = "uvicorn", marker = "sys_platform != 'emscripten'" },
@@ -1064,7 +1062,7 @@ requires-dist = [
 provides-extras = ["cli", "rich"]
 
 [package.metadata.requires-dev]
-codegen = [{ name = "datamodel-code-generator", specifier = "==0.57.0" }]
+codegen = [{ name = "datamodel-code-generator", specifier = "==0.81.0" }]
 dev = [
     { name = "blockbuster", marker = "python_full_version < '3.15'", specifier = ">=1.5.27" },
     { name = "blockbuster", marker = "python_full_version >= '3.15'", specifier = ">=1.5.29" },
@@ -1547,8 +1545,7 @@ source = { editable = "src/mcp-types" }
 dependencies = [
     { name = "pydantic", version = "2.12.5", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
     { name = "pydantic", version = "2.14.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
 ]
 
 [package.metadata]
@@ -1692,8 +1689,7 @@ version = "1.39.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "importlib-metadata" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/97/b9/3161be15bb8e3ad01be8be5a968a9237c3027c5be504362ff800fca3e442/opentelemetry_api-1.39.1.tar.gz", hash = "sha256:fbde8c80e1b937a2c61f20347e91c0c18a1940cecf012d62e65a7caf08967c9c", size = 65767, upload-time = "2025-12-11T13:32:39.182Z" }
 wheels = [
@@ -1723,8 +1719,7 @@ dependencies = [
     { name = "opentelemetry-proto" },
     { name = "opentelemetry-sdk" },
     { name = "requests" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/80/04/2a08fa9c0214ae38880df01e8bfae12b067ec0793446578575e5080d6545/opentelemetry_exporter_otlp_proto_http-1.39.1.tar.gz", hash = "sha256:31bdab9745c709ce90a49a0624c2bd445d31a28ba34275951a6a362d16a0b9cb", size = 17288, upload-time = "2025-12-11T13:32:42.029Z" }
 wheels = [
@@ -1765,8 +1760,7 @@ source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "opentelemetry-api" },
     { name = "opentelemetry-semantic-conventions" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/eb/fb/c76080c9ba07e1e8235d24cdcc4d125ef7aa3edf23eb4e497c2e50889adc/opentelemetry_sdk-1.39.1.tar.gz", hash = "sha256:cf4d4563caf7bff906c9f7967e2be22d0d6b349b908be0d90fb21c8e9c995cc6", size = 171460, upload-time = "2025-12-11T13:32:49.369Z" }
 wheels = [
@@ -1779,8 +1773,7 @@ version = "0.60b1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "opentelemetry-api" },
-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/91/df/553f93ed38bf22f4b999d9be9c185adb558982214f33eae539d3b5cd0858/opentelemetry_semantic_conventions-0.60b1.tar.gz", hash = "sha256:87c228b5a0669b748c76d76df6c364c369c28f1c465e50f661e39737e84bc953", size = 137935, upload-time = "2025-12-11T13:32:50.487Z" }
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@@ -1951,14 +1944,14 @@ source = { registry = "https://pypi.org/simple" }
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     "python_full_version >= '3.12' and python_full_version < '3.14' and sys_platform == 'emscripten'",
+    "python_full_version < '3.14' and sys_platform == 'win32'",
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-    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" } },
+    { name = "typing-extensions" },
     { name = "typing-inspection", version = "0.4.2", source = { registry = "https://pypi.org/simple" } },
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 sdist = { url = "https://files.pythonhosted.org/packages/69/44/36f1a6e523abc58ae5f928898e4aca2e0ea509b5aa6f6f392a5d882be928/pydantic-2.12.5.tar.gz", hash = "sha256:4d351024c75c0f085a9febbb665ce8c0c6ec5d30e903bdb6394b7ede26aebb49", size = 821591, upload-time = "2025-11-26T15:11:46.471Z" }
@@ -1977,7 +1970,7 @@ resolution-markers = [
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-    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" } },
+    { name = "typing-extensions" },
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