From ce2cdee07539345b88b54b1ee04be19708cc4ab8 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Wed, 3 Sep 2025 11:13:42 -0400
Subject: [PATCH 01/18] Rename CHANGES.md to CHANGELOG.md

---
 CHANGES.md => CHANGELOG.md                                    | 0
 packages/aws-sdk-signers/{CHANGES.md => CHANGELOG.md}         | 0
 packages/aws-sdk-signers/pyproject.toml                       | 2 +-
 packages/smithy-aws-core/{CHANGES.md => CHANGELOG.md}         | 0
 packages/smithy-aws-core/pyproject.toml                       | 2 +-
 packages/smithy-aws-event-stream/{CHANGES.md => CHANGELOG.md} | 0
 packages/smithy-aws-event-stream/pyproject.toml               | 2 +-
 packages/smithy-core/{CHANGES.md => CHANGELOG.md}             | 0
 packages/smithy-core/pyproject.toml                           | 2 +-
 packages/smithy-http/{CHANGES.md => CHANGELOG.md}             | 0
 packages/smithy-http/pyproject.toml                           | 2 +-
 packages/smithy-json/{CHANGES.md => CHANGELOG.md}             | 0
 packages/smithy-json/pyproject.toml                           | 2 +-
 13 files changed, 6 insertions(+), 6 deletions(-)
 rename CHANGES.md => CHANGELOG.md (100%)
 rename packages/aws-sdk-signers/{CHANGES.md => CHANGELOG.md} (100%)
 rename packages/smithy-aws-core/{CHANGES.md => CHANGELOG.md} (100%)
 rename packages/smithy-aws-event-stream/{CHANGES.md => CHANGELOG.md} (100%)
 rename packages/smithy-core/{CHANGES.md => CHANGELOG.md} (100%)
 rename packages/smithy-http/{CHANGES.md => CHANGELOG.md} (100%)
 rename packages/smithy-json/{CHANGES.md => CHANGELOG.md} (100%)

diff --git a/CHANGES.md b/CHANGELOG.md
similarity index 100%
rename from CHANGES.md
rename to CHANGELOG.md
diff --git a/packages/aws-sdk-signers/CHANGES.md b/packages/aws-sdk-signers/CHANGELOG.md
similarity index 100%
rename from packages/aws-sdk-signers/CHANGES.md
rename to packages/aws-sdk-signers/CHANGELOG.md
diff --git a/packages/aws-sdk-signers/pyproject.toml b/packages/aws-sdk-signers/pyproject.toml
index 3d9bae792..a3e0bd477 100644
--- a/packages/aws-sdk-signers/pyproject.toml
+++ b/packages/aws-sdk-signers/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 ]
 
 [project.urls]
-"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/aws-sdk-signers/CHANGES.md"
+"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/aws-sdk-signers/CHANGELOG.md"
 "Code" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/aws-sdk-signers/"
 "Issue tracker" = "https://github.com/smithy-lang/smithy-python/issues"
 
diff --git a/packages/smithy-aws-core/CHANGES.md b/packages/smithy-aws-core/CHANGELOG.md
similarity index 100%
rename from packages/smithy-aws-core/CHANGES.md
rename to packages/smithy-aws-core/CHANGELOG.md
diff --git a/packages/smithy-aws-core/pyproject.toml b/packages/smithy-aws-core/pyproject.toml
index 02f825e04..f61aa4b39 100644
--- a/packages/smithy-aws-core/pyproject.toml
+++ b/packages/smithy-aws-core/pyproject.toml
@@ -32,7 +32,7 @@ dependencies = [
 ]
 
 [project.urls]
-"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-aws-core/CHANGES.md"
+"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-aws-core/CHANGELOG.md"
 "Code" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-aws-core/"
 "Issue tracker" = "https://github.com/smithy-lang/smithy-python/issues"
 
diff --git a/packages/smithy-aws-event-stream/CHANGES.md b/packages/smithy-aws-event-stream/CHANGELOG.md
similarity index 100%
rename from packages/smithy-aws-event-stream/CHANGES.md
rename to packages/smithy-aws-event-stream/CHANGELOG.md
diff --git a/packages/smithy-aws-event-stream/pyproject.toml b/packages/smithy-aws-event-stream/pyproject.toml
index 809bbf6a0..25a219268 100644
--- a/packages/smithy-aws-event-stream/pyproject.toml
+++ b/packages/smithy-aws-event-stream/pyproject.toml
@@ -30,7 +30,7 @@ dependencies = [
 ]
 
 [project.urls]
-"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-aws-event-stream/CHANGES.md"
+"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-aws-event-stream/CHANGELOG.md"
 "Code" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-aws-event-stream/"
 "Issue tracker" = "https://github.com/smithy-lang/smithy-python/issues"
 
diff --git a/packages/smithy-core/CHANGES.md b/packages/smithy-core/CHANGELOG.md
similarity index 100%
rename from packages/smithy-core/CHANGES.md
rename to packages/smithy-core/CHANGELOG.md
diff --git a/packages/smithy-core/pyproject.toml b/packages/smithy-core/pyproject.toml
index a7ee38a63..a0931d29c 100644
--- a/packages/smithy-core/pyproject.toml
+++ b/packages/smithy-core/pyproject.toml
@@ -28,7 +28,7 @@ classifiers = [
 dependencies = []
 
 [project.urls]
-"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-core/CHANGES.md"
+"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-core/CHANGELOG.md"
 "Code" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-core/"
 "Issue tracker" = "https://github.com/smithy-lang/smithy-python/issues"
 
diff --git a/packages/smithy-http/CHANGES.md b/packages/smithy-http/CHANGELOG.md
similarity index 100%
rename from packages/smithy-http/CHANGES.md
rename to packages/smithy-http/CHANGELOG.md
diff --git a/packages/smithy-http/pyproject.toml b/packages/smithy-http/pyproject.toml
index 6645bd180..c1da51e18 100644
--- a/packages/smithy-http/pyproject.toml
+++ b/packages/smithy-http/pyproject.toml
@@ -30,7 +30,7 @@ dependencies = [
 ]
 
 [project.urls]
-"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-http/CHANGES.md"
+"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-http/CHANGELOG.md"
 "Code" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-http/"
 "Issue tracker" = "https://github.com/smithy-lang/smithy-python/issues"
 
diff --git a/packages/smithy-json/CHANGES.md b/packages/smithy-json/CHANGELOG.md
similarity index 100%
rename from packages/smithy-json/CHANGES.md
rename to packages/smithy-json/CHANGELOG.md
diff --git a/packages/smithy-json/pyproject.toml b/packages/smithy-json/pyproject.toml
index a79e7f922..b4c113e87 100644
--- a/packages/smithy-json/pyproject.toml
+++ b/packages/smithy-json/pyproject.toml
@@ -31,7 +31,7 @@ dependencies = [
 ]
 
 [project.urls]
-"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-json/CHANGES.md"
+"Changelog" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-json/CHANGELOG.md"
 "Code" = "https://github.com/smithy-lang/smithy-python/blob/develop/packages/smithy-json/"
 "Issue tracker" = "https://github.com/smithy-lang/smithy-python/issues"
 

From 13fede3d14d1e4f17a892b3d5d665e033f7debcc Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:24:53 -0400
Subject: [PATCH 02/18] Add new-entry changelog script

---
 scripts/changelog/new-entry.py | 79 ++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100755 scripts/changelog/new-entry.py

diff --git a/scripts/changelog/new-entry.py b/scripts/changelog/new-entry.py
new file mode 100755
index 000000000..845331230
--- /dev/null
+++ b/scripts/changelog/new-entry.py
@@ -0,0 +1,79 @@
+#!/usr/bin/env python3
+"""
+Create new changelog entries for a specific package.
+"""
+
+import argparse
+import json
+from datetime import datetime
+from pathlib import Path
+
+PROJECT_ROOT_DIR = Path(__file__).resolve().parent.parent.parent
+
+
+def get_package_changes_dir(package_name: str) -> Path:
+    package_path = PROJECT_ROOT_DIR / "packages" / package_name
+    changes_dir = package_path / ".changes"
+    return changes_dir
+
+
+def create_change_entry(
+    change_type: str,
+    description: str,
+    package_name: str,
+) -> str:
+    # Get package .changes directory and ensure it exists
+    changes_dir = PROJECT_ROOT_DIR / "packages" / package_name / ".changes"
+    changes_dir.mkdir(exist_ok=True)
+
+    # Create next-release directory for pending changes
+    next_release_dir = changes_dir / "next-release"
+    next_release_dir.mkdir(exist_ok=True)
+
+    # Generate unique filename
+    timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
+    filename = f"{package_name}-{change_type}-{timestamp}.json"
+
+    entry_data = {
+        "type": change_type,
+        "description": description,
+    }
+
+    entry_file = next_release_dir / filename
+    with open(entry_file, "w") as f:
+        json.dump(entry_data, f, indent=2)
+
+    print(f"Created changelog entry: {entry_file}")
+    return str(entry_file)
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Create a new changelog entry")
+    parser.add_argument(
+        "-t",
+        "--type",
+        # TODO: Remove the 'breaking' option once this project is stable.
+        choices=("feature", "enhancement", "bugfix", "breaking"),
+        required=True,
+        help="Type of change",
+    )
+    parser.add_argument(
+        "-d", "--description", required=True, help="Description of the change"
+    )
+    parser.add_argument(
+        "-p",
+        "--package",
+        required=True,
+        help="Package name",
+    )
+    args = parser.parse_args()
+
+    create_change_entry(
+        change_type=args.type,
+        description=args.description,
+        package_name=args.package,
+    )
+
+
+if __name__ == "__main__":
+    main()

From 469dfd19355ad6134d3a5ea6554aad0e635058ac Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:25:13 -0400
Subject: [PATCH 03/18] Add new-release changelog script

---
 scripts/changelog/new-release.py | 157 +++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100755 scripts/changelog/new-release.py

diff --git a/scripts/changelog/new-release.py b/scripts/changelog/new-release.py
new file mode 100755
index 000000000..55ec71f11
--- /dev/null
+++ b/scripts/changelog/new-release.py
@@ -0,0 +1,157 @@
+#!/usr/bin/env python3
+"""
+Create a new release by consolidating changelog entries from next-release directory
+into a version JSON file (x.y.z.json).
+"""
+
+import argparse
+import json
+import sys
+from pathlib import Path
+from typing import Any
+
+PROJECT_ROOT_DIR = Path(__file__).resolve().parent.parent.parent
+
+
+def collect_next_release_changes(next_release_dir: Path) -> list[dict[str, Any]]:
+    changes: list[dict[str, Any]] = []
+
+    if not next_release_dir.exists():
+        return changes
+
+    for entry_file in next_release_dir.iterdir():
+        if entry_file.is_file() and entry_file.suffix == ".json":
+            try:
+                with open(entry_file) as f:
+                    change_data = json.load(f)
+                    changes.append(change_data)
+            except (OSError, json.JSONDecodeError) as e:
+                print(f"Warning: Could not process {entry_file}: {e}", file=sys.stderr)
+                continue
+
+    # Sort changes by type for consistent ordering
+    type_order = {"breaking": 0, "feature": 1, "enhancement": 2, "bugfix": 3}
+    changes.sort(
+        key=lambda c: (
+            type_order.get(c.get("type", "enhancement"), 4),
+            c.get("description", ""),
+        )
+    )
+
+    return changes
+
+
+def create_version_file(
+    changes_dir: Path, version: str, changes: list[dict[str, Any]], summary: str | None = None
+) -> Path:
+    version_file = changes_dir / f"{version}.json"
+
+    if version_file.exists():
+        print(f"Error: Version file {version_file} already exists!")
+        sys.exit(1)
+
+    version_data: dict[str, Any] = {"changes": changes}
+
+    if summary:
+        version_data["summary"] = summary
+
+    with open(version_file, "w") as f:
+        json.dump(version_data, f, indent=2)
+
+    return version_file
+
+
+def cleanup_next_release_dir(next_release_dir: Path) -> int:
+    removed_count = 0
+
+    for entry_file in next_release_dir.iterdir():
+        if entry_file.is_file() and entry_file.suffix == ".json":
+            try:
+                entry_file.unlink()
+                removed_count += 1
+            except OSError as e:
+                print(f"Warning: Could not remove {entry_file}: {e}", file=sys.stderr)
+
+    return removed_count
+
+
+def create_new_release(
+    package_name: str, version: str, summary: str | None = None, dry_run: bool = False
+) -> int:
+    # Get package directories
+    changes_dir = PROJECT_ROOT_DIR / "packages" / package_name / ".changes"
+    next_release_dir = changes_dir / "next-release"
+
+    if not changes_dir.exists():
+        print(f"Error: No .changes directory found for package: {package_name}")
+        return 1
+
+    # Collect changes from next-release
+    changes = collect_next_release_changes(next_release_dir)
+
+    if not changes:
+        print(
+            f"No changelog entries found in {next_release_dir}.\n"
+            "Use 'python scripts/changelog/new-entry.py' to create entries first"
+        )
+        return 1
+
+    print(f"Found {len(changes)} changelog entries for {package_name} v{version}:")
+    for change in changes:
+        change_type = change.get("type", "unknown").upper()
+        description = change.get("description", "No description")
+        print(f"  {change_type}: {description}")
+
+    if dry_run:
+        print("\n[DRY RUN] Would create version file and remove next-release entries")
+        return 0
+
+    # Create version file
+    try:
+        version_file = create_version_file(changes_dir, version, changes, summary)
+        print(f"\nCreated version file: {version_file}")
+    except Exception as e:
+        print(f"Error creating version file: {e}")
+        return 1
+
+    # Clean up next-release directory
+    removed_count = cleanup_next_release_dir(next_release_dir)
+    print(f"Removed {removed_count} changelog entries from next-release")
+    print(f"✅ Successfully created release {version} for {package_name}")
+
+    return 0
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(
+        description="Create a new release by consolidating changelog entries"
+    )
+    parser.add_argument("-p", "--package", required=True, help="Package name")
+    parser.add_argument(
+        "-v", "--version", required=True, help="Release version (e.g., 1.0.0)"
+    )
+    parser.add_argument("-s", "--summary", help="Optional release summary")
+    parser.add_argument(
+        "--dry-run",
+        action="store_true",
+        help="Show what would be done without making changes",
+    )
+
+    args = parser.parse_args()
+
+    # Basic version format validation
+    version_parts = args.version.split(".")
+    if len(version_parts) != 3 or not all(part.isdigit() for part in version_parts):
+        print("Error: Version must be in format x.y.z (e.g., 1.2.3)")
+        return 1
+
+    return create_new_release(
+        package_name=args.package,
+        version=args.version,
+        summary=args.summary,
+        dry_run=args.dry_run,
+    )
+
+
+if __name__ == "__main__":
+    exit(main())

From 9bac8f7d46ed95e949de39209f757f3b84b9c0db Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:27:03 -0400
Subject: [PATCH 04/18] Add changelog dependency group with jinja2 dependency

---
 pyproject.toml |  5 ++++-
 uv.lock        | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/pyproject.toml b/pyproject.toml
index 96df8433f..646dbd829 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,11 +21,14 @@ lint = [
 typing = [
     "pyright>=1.1.400",
 ]
+changelog = [
+    "jinja2>=3.1.6"
+]
 
 [tool.uv]
 required-version = ">=0.7.2"
 package = false
-default-groups = ["test", "lint", "typing"]
+default-groups = ["test", "lint", "typing", "changelog"]
 
 [tool.uv.workspace]
 members = ["packages/*"]
diff --git a/uv.lock b/uv.lock
index 819fdcefb..bbefdb69a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -359,6 +359,56 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/2c/e1/e6716421ea10d38022b952c159d5161ca1193197fb744506875fbb87ea7b/iniconfig-2.1.0-py3-none-any.whl", hash = "sha256:9deba5723312380e77435581c6bf4935c94cbfab9b1ed33ef8d238ea168eb760", size = 6050, upload-time = "2025-03-19T20:10:01.071Z" },
 ]
 
+[[package]]
+name = "jinja2"
+version = "3.1.6"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "markupsafe" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/df/bf/f7da0350254c0ed7c72f3e33cef02e048281fec7ecec5f032d4aac52226b/jinja2-3.1.6.tar.gz", hash = "sha256:0137fb05990d35f1275a587e9aee6d56da821fc83491a0fb838183be43f66d6d", size = 245115, upload-time = "2025-03-05T20:05:02.478Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/62/a1/3d680cbfd5f4b8f15abc1d571870c5fc3e594bb582bc3b64ea099db13e56/jinja2-3.1.6-py3-none-any.whl", hash = "sha256:85ece4451f492d0c13c5dd7c13a64681a86afae63a5f347908daf103ce6d2f67", size = 134899, upload-time = "2025-03-05T20:05:00.369Z" },
+]
+
+[[package]]
+name = "markupsafe"
+version = "3.0.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/b2/97/5d42485e71dfc078108a86d6de8fa46db44a1a9295e89c5d6d4a06e23a62/markupsafe-3.0.2.tar.gz", hash = "sha256:ee55d3edf80167e48ea11a923c7386f4669df67d7994554387f84e7d8b0a2bf0", size = 20537, upload-time = "2024-10-18T15:21:54.129Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/22/09/d1f21434c97fc42f09d290cbb6350d44eb12f09cc62c9476effdb33a18aa/MarkupSafe-3.0.2-cp312-cp312-macosx_10_13_universal2.whl", hash = "sha256:9778bd8ab0a994ebf6f84c2b949e65736d5575320a17ae8984a77fab08db94cf", size = 14274, upload-time = "2024-10-18T15:21:13.777Z" },
+    { url = "https://files.pythonhosted.org/packages/6b/b0/18f76bba336fa5aecf79d45dcd6c806c280ec44538b3c13671d49099fdd0/MarkupSafe-3.0.2-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:846ade7b71e3536c4e56b386c2a47adf5741d2d8b94ec9dc3e92e5e1ee1e2225", size = 12348, upload-time = "2024-10-18T15:21:14.822Z" },
+    { url = "https://files.pythonhosted.org/packages/e0/25/dd5c0f6ac1311e9b40f4af06c78efde0f3b5cbf02502f8ef9501294c425b/MarkupSafe-3.0.2-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:1c99d261bd2d5f6b59325c92c73df481e05e57f19837bdca8413b9eac4bd8028", size = 24149, upload-time = "2024-10-18T15:21:15.642Z" },
+    { url = "https://files.pythonhosted.org/packages/f3/f0/89e7aadfb3749d0f52234a0c8c7867877876e0a20b60e2188e9850794c17/MarkupSafe-3.0.2-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:e17c96c14e19278594aa4841ec148115f9c7615a47382ecb6b82bd8fea3ab0c8", size = 23118, upload-time = "2024-10-18T15:21:17.133Z" },
+    { url = "https://files.pythonhosted.org/packages/d5/da/f2eeb64c723f5e3777bc081da884b414671982008c47dcc1873d81f625b6/MarkupSafe-3.0.2-cp312-cp312-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:88416bd1e65dcea10bc7569faacb2c20ce071dd1f87539ca2ab364bf6231393c", size = 22993, upload-time = "2024-10-18T15:21:18.064Z" },
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+]
+
 [[package]]
 name = "multidict"
 version = "6.4.3"
@@ -721,6 +771,9 @@ version = "0.1.0"
 source = { virtual = "." }
 
 [package.dev-dependencies]
+changelog = [
+    { name = "jinja2" },
+]
 lint = [
     { name = "black" },
     { name = "docformatter" },
@@ -739,6 +792,7 @@ typing = [
 [package.metadata]
 
 [package.metadata.requires-dev]
+changelog = [{ name = "jinja2", specifier = ">=3.1.6" }]
 lint = [
     { name = "black", specifier = ">=25.1.0" },
     { name = "docformatter", specifier = ">=1.7.5" },

From b8aab922d9eded624d8ed09621485a77386c283c Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:28:00 -0400
Subject: [PATCH 05/18] Add render changelog script and changelog template

---
 scripts/changelog/render.py         | 149 ++++++++++++++++++++++++++++
 scripts/changelog/templates/PACKAGE |  28 ++++++
 2 files changed, 177 insertions(+)
 create mode 100755 scripts/changelog/render.py
 create mode 100644 scripts/changelog/templates/PACKAGE

diff --git a/scripts/changelog/render.py b/scripts/changelog/render.py
new file mode 100755
index 000000000..263058ab8
--- /dev/null
+++ b/scripts/changelog/render.py
@@ -0,0 +1,149 @@
+#!/usr/bin/env python3
+"""
+Render changelog entries from version JSON files using Jinja templates.
+"""
+
+import argparse
+import json
+import re
+import sys
+from pathlib import Path
+from typing import IO, Any
+
+from jinja2 import Template
+
+PROJECT_ROOT_DIR = Path(__file__).resolve().parent.parent.parent
+
+TEMPLATES_DIR = PROJECT_ROOT_DIR / "scripts" / "changelog" / "templates"
+DEFAULT_TEMPLATE_NAME = "PACKAGE"
+VERSION_PATTERN = r"^\d+\.\d+\.\d+\.json$"
+
+
+def get_sorted_versions(changes_dir: Path) -> list[str]:
+    """Get sorted list of version numbers from .changes directory."""
+    version_pattern = re.compile(VERSION_PATTERN)
+    versions: list[str] = []
+
+    for file in changes_dir.iterdir():
+        if file.is_file() and version_pattern.match(file.name):
+            versions.append(file.stem)
+
+    # Sort by semantic version (oldest first)
+    versions.sort(key=lambda v: [int(x) for x in v.split(".")])
+    return versions
+
+
+def load_package_releases(changes_dir: Path) -> dict[str, dict[str, Any]]:
+    """Load all changelog entries from version JSON files."""
+    releases: dict[str, dict[str, Any]] = {}
+
+    for version_number in get_sorted_versions(changes_dir):
+        filename = changes_dir / f"{version_number}.json"
+        try:
+            with open(filename) as f:
+                data = json.load(f)
+            # Restructure data to match PACKAGE template expectations
+            changes = data.get("changes", [])
+            formatted_changes = [
+                {
+                    "type": change.get("type", "enhancement"),
+                    "description": change.get("description", ""),
+                }
+                for change in changes
+            ]
+
+            releases[version_number] = {
+                "summary": data.get("summary", ""),
+                "changes": formatted_changes,
+            }
+        except (OSError, json.JSONDecodeError) as e:
+            print(f"Warning: Could not process {filename}: {e}", file=sys.stderr)
+            continue
+
+    return releases
+
+
+def render_changes(
+    changes: dict[str, dict[str, Any]], out: IO[str], template_contents: str
+) -> None:
+    """Render changelog using Jinja template."""
+    # Reverse order to show newest first
+    context: dict[str, Any] = {"releases": reversed(list(changes.items()))}
+
+    template = Template(template_contents)
+
+    result = template.render(**context)
+    out.write(result)
+
+
+def render_package_changelog(
+    package_name: str, template_name: str | None = None, output_path: Path | None = None
+) -> int:
+    # Determine changes directory from package name
+    package_dir = PROJECT_ROOT_DIR / "packages" / package_name
+    changes_dir = package_dir / ".changes"
+
+    if not changes_dir.exists():
+        print(f"No .changes directory found for package: {package_name}")
+        return 1
+
+    # Load changes from the directory
+    changes: dict[str, dict[str, Any]] = load_package_releases(changes_dir)
+
+    if not changes:
+        print(f"No version JSON files found in {changes_dir}")
+        return 1
+
+    # Get template contents
+    template_path = TEMPLATES_DIR / (template_name or DEFAULT_TEMPLATE_NAME)
+
+    if not template_path.exists():
+        print(f"Template not found: {template_path}")
+        return 1
+
+    try:
+        with open(template_path) as f:
+            template_contents = f.read()
+    except OSError as e:
+        print(f"Error reading template {template_path}: {e}")
+        return 1
+
+    # Render to output
+    if output_path:
+        output_path.parent.mkdir(parents=True, exist_ok=True)
+        with open(output_path, "w") as f:
+            render_changes(changes, f, template_contents)
+        print(f"Changelog written to: {output_path}")
+    else:
+        render_changes(changes, sys.stdout, template_contents)
+
+    return 0
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(
+        description="Render package changelog from changes files"
+    )
+    parser.add_argument(
+        "-p",
+        "--package",
+        required=True,
+        help="Package name (looks in packages/<name>/.changes)",
+    )
+    parser.add_argument(
+        "-t",
+        "--template",
+        help=f"Template name (looks in scripts/changelog/templates/, defaults to '{DEFAULT_TEMPLATE_NAME}')",
+    )
+    parser.add_argument(
+        "-o", "--output", type=Path, help="Output file path (default: stdout)"
+    )
+
+    args = parser.parse_args()
+    return render_package_changelog(
+        package_name=args.package, template_name=args.template, output_path=args.output
+    )
+
+
+if __name__ == "__main__":
+    exit(main())
diff --git a/scripts/changelog/templates/PACKAGE b/scripts/changelog/templates/PACKAGE
new file mode 100644
index 000000000..e74caf869
--- /dev/null
+++ b/scripts/changelog/templates/PACKAGE
@@ -0,0 +1,28 @@
+# Changelog
+{% for release, changes in releases %}
+## v{{ release }}
+{%- if changes.summary %}
+
+{{ changes.summary }}
+{%- endif %}
+{%- for type_name in ['breaking', 'feature', 'enhancement', 'bugfix'] %}
+{%- for change in changes.changes if change.type == type_name %}
+{%- if loop.first %}
+{%- if type_name == 'breaking' %}
+
+### Breaking Changes
+{%- elif type_name == 'feature' %}
+
+### Features
+{%- elif type_name == 'enhancement' %}
+
+### Enhancements
+{%- elif type_name == 'bugfix' %}
+
+### Bug fixes
+{%- endif %}
+{%- endif %}
+* {{ change.description }}
+{%- endfor %}
+{%- endfor %}
+{% endfor %}

From d75004b91878fc861019feff15d2ebd2c5166281 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:29:37 -0400
Subject: [PATCH 06/18] Backfill aws-sdk-signers changelog entries

---
 packages/aws-sdk-signers/.changes/0.0.1.json | 24 +++++++++++++++
 packages/aws-sdk-signers/.changes/0.0.2.json | 12 ++++++++
 packages/aws-sdk-signers/.changes/0.0.3.json | 20 ++++++++++++
 packages/aws-sdk-signers/CHANGELOG.md        | 32 ++++++--------------
 4 files changed, 66 insertions(+), 22 deletions(-)
 create mode 100644 packages/aws-sdk-signers/.changes/0.0.1.json
 create mode 100644 packages/aws-sdk-signers/.changes/0.0.2.json
 create mode 100644 packages/aws-sdk-signers/.changes/0.0.3.json

diff --git a/packages/aws-sdk-signers/.changes/0.0.1.json b/packages/aws-sdk-signers/.changes/0.0.1.json
new file mode 100644
index 000000000..0c7c27d56
--- /dev/null
+++ b/packages/aws-sdk-signers/.changes/0.0.1.json
@@ -0,0 +1,24 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added `SigV4Signer` to sign arbitrary requests sychronously."
+    },
+    {
+      "type": "feature",
+      "description": "Added `AsyncSigV4Signer` to sign arbitrary requests asychronously."
+    },
+    {
+      "type": "feature",
+      "description": "Added example `SigV4Auth` for integrating directly with Requests' `auth` parameter."
+    },
+    {
+      "type": "feature",
+      "description": "Added `SigV4Signer` for integrating with the AIOHTTP request workflow."
+    },
+    {
+      "type": "feature",
+      "description": "Added `SigV4Curl` for generating signed curl commands."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/aws-sdk-signers/.changes/0.0.2.json b/packages/aws-sdk-signers/.changes/0.0.2.json
new file mode 100644
index 000000000..5983e0afb
--- /dev/null
+++ b/packages/aws-sdk-signers/.changes/0.0.2.json
@@ -0,0 +1,12 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added new `content_checksum_enabled` parameter to SigV4SigningProperties. This will enable users to control the inclusion of the `X-Amz-Content-SHA256` header required by S3. This is disabled by _default_, so you will need to set this to `True` for any S3 requests."
+    },
+    {
+      "type": "bugfix",
+      "description": "Fixed incorrect exclusion of `X-Amz-Content-SHA256` header from some requests."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/aws-sdk-signers/.changes/0.0.3.json b/packages/aws-sdk-signers/.changes/0.0.3.json
new file mode 100644
index 000000000..50b398eaf
--- /dev/null
+++ b/packages/aws-sdk-signers/.changes/0.0.3.json
@@ -0,0 +1,20 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added AsyncEventSigner for Amazon Event Stream event signing."
+    },
+    {
+      "type": "feature",
+      "description": "Added new `uri_encode_path` parameter to SigV4SigningProperties. This boolean can be toggled to double encode the URI path."
+    },
+    {
+      "type": "bugfix",
+      "description": "Fixed bug with async seekable payloads on requests."
+    },
+    {
+      "type": "bugfix",
+      "description": "Fixed bug where paths were not being properly double-encoded."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/aws-sdk-signers/CHANGELOG.md b/packages/aws-sdk-signers/CHANGELOG.md
index bfa400fe5..263b03fdd 100644
--- a/packages/aws-sdk-signers/CHANGELOG.md
+++ b/packages/aws-sdk-signers/CHANGELOG.md
@@ -1,40 +1,28 @@
 # Changelog
 
-## Unreleased
-
-* <Add new items here>
-
 ## v0.0.3
 
 ### Features
 * Added AsyncEventSigner for Amazon Event Stream event signing.
-* Added new ``uri_encode_path`` parameter to SigV4SigningProperties.
-  This boolean can be toggled to double encode the URI path.
+* Added new `uri_encode_path` parameter to SigV4SigningProperties. This boolean can be toggled to double encode the URI path.
 
-### Bugfixes
+### Bug fixes
 * Fixed bug with async seekable payloads on requests.
 * Fixed bug where paths were not being properly double-encoded.
 
 ## v0.0.2
 
-### Feature
-* Added new ``content_checksum_enabled`` parameter to SigV4SigningProperties.
-
-  This will enable users to control the inclusion of the `X-Amz-Content-SHA256`
-  header required by S3. This is _disabled_ by default, so you will need to
-  set this to `True` for any S3 requests.
+### Features
+* Added new `content_checksum_enabled` parameter to SigV4SigningProperties. This will enable users to control the inclusion of the `X-Amz-Content-SHA256` header required by S3. This is disabled by _default_, so you will need to set this to `True` for any S3 requests.
 
-### Bugfixes
+### Bug fixes
 * Fixed incorrect exclusion of `X-Amz-Content-SHA256` header from some requests.
 
 ## v0.0.1
 
 ### Features
-* Added SigV4Signer to sign arbitrary requests sychronously.
-* Added AsyncSigV4Signer to sign arbitrary requests asychronously.
-* Added example SigV4Auth for integrating directly with Requests'
-  ``auth`` parameter.
-* Added SigV4Signer for integrating with the AIOHTTP request
-  workflow.
-* Added SigV4Curl for generating signed curl commands.
-
+* Added `SigV4Signer` to sign arbitrary requests sychronously.
+* Added `AsyncSigV4Signer` to sign arbitrary requests asychronously.
+* Added example `SigV4Auth` for integrating directly with Requests' `auth` parameter.
+* Added `SigV4Signer` for integrating with the AIOHTTP request workflow.
+* Added `SigV4Curl` for generating signed curl commands.

From 770ccf0fd522a9002e1d2d771b3e8c298744e5da Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:30:05 -0400
Subject: [PATCH 07/18] Backfill smithy-aws-core changelog entries

---
 packages/smithy-aws-core/.changes/0.0.1.json  | 20 ++++++++++++++++++
 packages/smithy-aws-core/.changes/0.0.2.json  |  8 +++++++
 packages/smithy-aws-core/.changes/0.0.3.json  |  8 +++++++
 ...ithy-aws-core-breaking-20250904125854.json |  4 ++++
 ...mithy-aws-core-feature-20250904125834.json |  4 ++++
 packages/smithy-aws-core/CHANGELOG.md         | 21 +++----------------
 6 files changed, 47 insertions(+), 18 deletions(-)
 create mode 100644 packages/smithy-aws-core/.changes/0.0.1.json
 create mode 100644 packages/smithy-aws-core/.changes/0.0.2.json
 create mode 100644 packages/smithy-aws-core/.changes/0.0.3.json
 create mode 100644 packages/smithy-aws-core/.changes/next-release/smithy-aws-core-breaking-20250904125854.json
 create mode 100644 packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json

diff --git a/packages/smithy-aws-core/.changes/0.0.1.json b/packages/smithy-aws-core/.changes/0.0.1.json
new file mode 100644
index 000000000..4f1a5e7c8
--- /dev/null
+++ b/packages/smithy-aws-core/.changes/0.0.1.json
@@ -0,0 +1,20 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added support for Instance Metadata Service (IMDS) credential resolution."
+    },
+    {
+      "type": "feature",
+      "description": "Added basic endpoint support."
+    },
+    {
+      "type": "feature",
+      "description": "Added basic User Agent support."
+    },
+    {
+      "type": "feature",
+      "description": "Added basic AWS specific protocol support for RestJson1 and HTTP bindings."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-aws-core/.changes/0.0.2.json b/packages/smithy-aws-core/.changes/0.0.2.json
new file mode 100644
index 000000000..0d250a117
--- /dev/null
+++ b/packages/smithy-aws-core/.changes/0.0.2.json
@@ -0,0 +1,8 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added support for Container credential resolution, commonly used with ECS/EKS."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-aws-core/.changes/0.0.3.json b/packages/smithy-aws-core/.changes/0.0.3.json
new file mode 100644
index 000000000..cb998b193
--- /dev/null
+++ b/packages/smithy-aws-core/.changes/0.0.3.json
@@ -0,0 +1,8 @@
+{
+  "changes": [
+    {
+      "type": "bugfix",
+      "description": "Rename `ContainerCredentialResolver` to `ContainerCredentialsResolver` to match new naming standard."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-breaking-20250904125854.json b/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-breaking-20250904125854.json
new file mode 100644
index 000000000..ddf53a698
--- /dev/null
+++ b/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-breaking-20250904125854.json
@@ -0,0 +1,4 @@
+{
+  "type": "breaking",
+  "description": "Updated sigv4 auth resolution and identity providers to the new transport-agnostic interfaces."
+}
\ No newline at end of file
diff --git a/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json b/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json
new file mode 100644
index 000000000..3d6ae9ef0
--- /dev/null
+++ b/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json
@@ -0,0 +1,4 @@
+{
+  "type": "feature",
+  "description": "Added a hand-written implmentation for the `restJson1` protocol."
+}
\ No newline at end of file
diff --git a/packages/smithy-aws-core/CHANGELOG.md b/packages/smithy-aws-core/CHANGELOG.md
index bad47df65..db7b5c0ab 100644
--- a/packages/smithy-aws-core/CHANGELOG.md
+++ b/packages/smithy-aws-core/CHANGELOG.md
@@ -1,33 +1,18 @@
 # Changelog
 
-## Unreleased
-
-* _Add new items here_
-
-### Breaking Changes
-
-* Updated sigv4 auth resolution and identity providers to the new transport-
-  agnostic interfaces.
-
-### Features
-
-* Added a hand-written implmentation for the `restJson1` protocol.
-
 ## v0.0.3
 
-### Bugfixes
-* Rename `ContainerCredentialResolver` to `ContainerCredentialsResolver` to
-  match new naming standard.
+### Bug fixes
+* Rename `ContainerCredentialResolver` to `ContainerCredentialsResolver` to match new naming standard.
 
 ## v0.0.2
 
-### Feature
+### Features
 * Added support for Container credential resolution, commonly used with ECS/EKS.
 
 ## v0.0.1
 
 ### Features
-
 * Added support for Instance Metadata Service (IMDS) credential resolution.
 * Added basic endpoint support.
 * Added basic User Agent support.

From f7ca077727565b723d0e2d85a29e2149b1756eac Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:30:51 -0400
Subject: [PATCH 08/18] Backfill smithy-aws-event-stream changelog entries

---
 packages/smithy-aws-event-stream/.changes/0.0.1.json | 12 ++++++++++++
 packages/smithy-aws-event-stream/CHANGELOG.md        |  4 ----
 2 files changed, 12 insertions(+), 4 deletions(-)
 create mode 100644 packages/smithy-aws-event-stream/.changes/0.0.1.json

diff --git a/packages/smithy-aws-event-stream/.changes/0.0.1.json b/packages/smithy-aws-event-stream/.changes/0.0.1.json
new file mode 100644
index 000000000..4a9e9bd06
--- /dev/null
+++ b/packages/smithy-aws-event-stream/.changes/0.0.1.json
@@ -0,0 +1,12 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added basic support for the [Amazon Event Stream](https://smithy.io/2.0/aws/amazon-eventstream.html) specification."
+    },
+    {
+      "type": "feature",
+      "description": "Added support for unidirectdional and bidirectional event streams."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-aws-event-stream/CHANGELOG.md b/packages/smithy-aws-event-stream/CHANGELOG.md
index dd0c93f83..53321441a 100644
--- a/packages/smithy-aws-event-stream/CHANGELOG.md
+++ b/packages/smithy-aws-event-stream/CHANGELOG.md
@@ -1,9 +1,5 @@
 # Changelog
 
-## Unreleased
-
-* <Add new items here>
-
 ## v0.0.1
 
 ### Features

From 0411fc47801ae8d5463e94d87588790591422037 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:31:15 -0400
Subject: [PATCH 09/18] Backfill smithy-core changelog entries

---
 packages/smithy-core/.changes/0.0.1.json      |  8 +++++
 packages/smithy-core/.changes/0.0.2.json      |  8 +++++
 .../smithy-core-breaking-20250904131215.json  |  4 +++
 .../smithy-core-breaking-20250904131233.json  |  4 +++
 .../smithy-core-breaking-20250904131302.json  |  4 +++
 ...mithy-core-enhancement-20250904131027.json |  4 +++
 .../smithy-core-feature-20250904131114.json   |  4 +++
 .../smithy-core-feature-20250904131129.json   |  4 +++
 .../smithy-core-feature-20250904131140.json   |  4 +++
 .../smithy-core-feature-20250904131155.json   |  4 +++
 packages/smithy-core/CHANGELOG.md             | 29 +------------------
 11 files changed, 49 insertions(+), 28 deletions(-)
 create mode 100644 packages/smithy-core/.changes/0.0.1.json
 create mode 100644 packages/smithy-core/.changes/0.0.2.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-enhancement-20250904131027.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131114.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131129.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131140.json
 create mode 100644 packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131155.json

diff --git a/packages/smithy-core/.changes/0.0.1.json b/packages/smithy-core/.changes/0.0.1.json
new file mode 100644
index 000000000..1e2af7d10
--- /dev/null
+++ b/packages/smithy-core/.changes/0.0.1.json
@@ -0,0 +1,8 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added support for minimal components required for SDK generation."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/0.0.2.json b/packages/smithy-core/.changes/0.0.2.json
new file mode 100644
index 000000000..2e3ce7880
--- /dev/null
+++ b/packages/smithy-core/.changes/0.0.2.json
@@ -0,0 +1,8 @@
+{
+  "changes": [
+    {
+      "type": "bugfix",
+      "description": "Fixed incorrect interceptors for `modify_before_signing` and `modify_before_transmit`."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json
new file mode 100644
index 000000000..d2671b952
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json
@@ -0,0 +1,4 @@
+{
+  "type": "breaking",
+  "description": "Updated retry interfaces to pull information from exceptions instead of requriing a separate classification step."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json
new file mode 100644
index 000000000..f666a9d79
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json
@@ -0,0 +1,4 @@
+{
+  "type": "breaking",
+  "description": "Introduced transport-agnostic interfaces for identiy and auth, replacing the existing interfaces that were coupled to HTTP requests and responses."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json
new file mode 100644
index 000000000..b2b3cefc8
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json
@@ -0,0 +1,4 @@
+{
+  "type": "breaking",
+  "description": "Replaced  suffix with  to follow PEP8 conventions."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-enhancement-20250904131027.json b/packages/smithy-core/.changes/next-release/smithy-core-enhancement-20250904131027.json
new file mode 100644
index 000000000..e4fa2b941
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-enhancement-20250904131027.json
@@ -0,0 +1,4 @@
+{
+  "type": "enhancement",
+  "description": "Added usages of `TypeForm` from PEP747 via `typing_extensions` to better support typing for event streams and typed properties."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131114.json b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131114.json
new file mode 100644
index 000000000..fae46e5cc
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131114.json
@@ -0,0 +1,4 @@
+{
+  "type": "feature",
+  "description": "Introduced the `ClientProtocol` interface to allow for hand-written protocol implementations and protocol swapping at runtime."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131129.json b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131129.json
new file mode 100644
index 000000000..9928ed89b
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131129.json
@@ -0,0 +1,4 @@
+{
+  "type": "feature",
+  "description": "Updated exceptions to embed retryablity information."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131140.json b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131140.json
new file mode 100644
index 000000000..baed98bdb
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131140.json
@@ -0,0 +1,4 @@
+{
+  "type": "feature",
+  "description": "Updated schema members to preserve their ordering from the model using dict ordering, which significantly cuts back the amount of code that must be generated."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131155.json b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131155.json
new file mode 100644
index 000000000..02bb8f645
--- /dev/null
+++ b/packages/smithy-core/.changes/next-release/smithy-core-feature-20250904131155.json
@@ -0,0 +1,4 @@
+{
+  "type": "feature",
+  "description": "Introduced a hand-written request pipeline to replace the one that was code-generated in Java."
+}
\ No newline at end of file
diff --git a/packages/smithy-core/CHANGELOG.md b/packages/smithy-core/CHANGELOG.md
index bccdb8541..8049bd7e1 100644
--- a/packages/smithy-core/CHANGELOG.md
+++ b/packages/smithy-core/CHANGELOG.md
@@ -1,38 +1,11 @@
 # Changelog
 
-## Unreleased
-
-### Breaking Changes
-
-* Replaced `Exception` suffix with `Error` to follow PEP8 conventions.
-* Introduced transport-agnostic interfaces for identiy and auth, replacing the
-  existing interfaces that were coupled to HTTP requests and responses.
-* Updated retry interfaces to pull information from exceptions instead of requriing
-  a separate classification step.
-
-### Features
-
-* Introduced a hand-written request pipeline to replace the one that was code-generated
-  in Java.
-* Updated schema members to preserve their ordering from the model using dict ordering,
-  which significantly cuts back the amount of code that must be generated.
-* Updated exceptions to embed retryablity information.
-* Introduced the `ClientProtocol` interface to allow for hand-written protocol
-  implementations and protocol swapping at runtime.
-
-### Typing
-
-* Added usages of `TypeForm` from PEP747 via `typing_extensions` to better support
-  typing for event streams and typed properties.
-
 ## v0.0.2
 
-### Bugfixes
-
+### Bug fixes
 * Fixed incorrect interceptors for `modify_before_signing` and `modify_before_transmit`.
 
 ## v0.0.1
 
 ### Features
-
 * Added support for minimal components required for SDK generation.

From 0df14dcfa30b1432b1fb9e8bf89388dff748824b Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:31:31 -0400
Subject: [PATCH 10/18] Backfill smithy-http changelog entries

---
 packages/smithy-http/.changes/0.0.1.json             | 12 ++++++++++++
 .../smithy-http-breaking-20250904132003.json         |  4 ++++
 .../smithy-http-feature-20250904131946.json          |  4 ++++
 packages/smithy-http/CHANGELOG.md                    | 12 ------------
 4 files changed, 20 insertions(+), 12 deletions(-)
 create mode 100644 packages/smithy-http/.changes/0.0.1.json
 create mode 100644 packages/smithy-http/.changes/next-release/smithy-http-breaking-20250904132003.json
 create mode 100644 packages/smithy-http/.changes/next-release/smithy-http-feature-20250904131946.json

diff --git a/packages/smithy-http/.changes/0.0.1.json b/packages/smithy-http/.changes/0.0.1.json
new file mode 100644
index 000000000..85ef764fe
--- /dev/null
+++ b/packages/smithy-http/.changes/0.0.1.json
@@ -0,0 +1,12 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added support for aiohttp and AWSCRT http clients."
+    },
+    {
+      "type": "feature",
+      "description": "Added basic HTTP primitives and interfaces for Smithy clients."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-http/.changes/next-release/smithy-http-breaking-20250904132003.json b/packages/smithy-http/.changes/next-release/smithy-http-breaking-20250904132003.json
new file mode 100644
index 000000000..2d7c4154f
--- /dev/null
+++ b/packages/smithy-http/.changes/next-release/smithy-http-breaking-20250904132003.json
@@ -0,0 +1,4 @@
+{
+  "type": "breaking",
+  "description": "Removed identity and auth interfaces in favor of the transport-agnostic interfaces introduced in `smithy-core`."
+}
\ No newline at end of file
diff --git a/packages/smithy-http/.changes/next-release/smithy-http-feature-20250904131946.json b/packages/smithy-http/.changes/next-release/smithy-http-feature-20250904131946.json
new file mode 100644
index 000000000..5345cdca9
--- /dev/null
+++ b/packages/smithy-http/.changes/next-release/smithy-http-feature-20250904131946.json
@@ -0,0 +1,4 @@
+{
+  "type": "feature",
+  "description": "Introduced schema-based serializers and deserializers for HTTP binding protocols."
+}
\ No newline at end of file
diff --git a/packages/smithy-http/CHANGELOG.md b/packages/smithy-http/CHANGELOG.md
index c1a057e0c..6357640c3 100644
--- a/packages/smithy-http/CHANGELOG.md
+++ b/packages/smithy-http/CHANGELOG.md
@@ -1,19 +1,7 @@
 # Changelog
 
-## Unreleased
-
-### Breaking Changes
-
-* Removed identity and auth interfaces in favor of the transport-agnostic interfaces
-  introduced in `smithy-core`.
-
-### Features
-
-* Introduced schema-based serializers and deserializers for HTTP binding protocols.
-
 ## v0.0.1
 
 ### Features
-
 * Added support for aiohttp and AWSCRT http clients.
 * Added basic HTTP primitives and interfaces for Smithy clients.

From dea2721296c0460e3bb003092511f93756a8a5a6 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:31:53 -0400
Subject: [PATCH 11/18] Backfill smithy-json changelog entries

---
 packages/smithy-json/.changes/0.0.1.json | 8 ++++++++
 packages/smithy-json/CHANGELOG.md        | 6 +-----
 2 files changed, 9 insertions(+), 5 deletions(-)
 create mode 100644 packages/smithy-json/.changes/0.0.1.json

diff --git a/packages/smithy-json/.changes/0.0.1.json b/packages/smithy-json/.changes/0.0.1.json
new file mode 100644
index 000000000..fc8a989d9
--- /dev/null
+++ b/packages/smithy-json/.changes/0.0.1.json
@@ -0,0 +1,8 @@
+{
+  "changes": [
+    {
+      "type": "feature",
+      "description": "Added support for json primitives in Smithy clients."
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/smithy-json/CHANGELOG.md b/packages/smithy-json/CHANGELOG.md
index f0b53dc16..adbed8574 100644
--- a/packages/smithy-json/CHANGELOG.md
+++ b/packages/smithy-json/CHANGELOG.md
@@ -1,10 +1,6 @@
 # Changelog
 
-## Unreleased
-
-* <Add new items here>
-
 ## v0.0.1
 
-### Feature
+### Features
 * Added support for json primitives in Smithy clients.

From 65deff5c6684b318d2de9644921acdd6782c20ca Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:51:48 -0400
Subject: [PATCH 12/18] fix formatting

---
 scripts/changelog/new-release.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/changelog/new-release.py b/scripts/changelog/new-release.py
index 55ec71f11..bdc7d4315 100755
--- a/scripts/changelog/new-release.py
+++ b/scripts/changelog/new-release.py
@@ -42,7 +42,10 @@ def collect_next_release_changes(next_release_dir: Path) -> list[dict[str, Any]]
 
 
 def create_version_file(
-    changes_dir: Path, version: str, changes: list[dict[str, Any]], summary: str | None = None
+    changes_dir: Path,
+    version: str,
+    changes: list[dict[str, Any]],
+    summary: str | None = None,
 ) -> Path:
     version_file = changes_dir / f"{version}.json"
 

From 23bbbc145be4ad1a4f3f303e808ffc321935a74e Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 4 Sep 2025 13:57:11 -0400
Subject: [PATCH 13/18] Add license header to scripts

---
 scripts/changelog/new-entry.py   | 2 ++
 scripts/changelog/new-release.py | 2 ++
 scripts/changelog/render.py      | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/scripts/changelog/new-entry.py b/scripts/changelog/new-entry.py
index 845331230..2551e0989 100755
--- a/scripts/changelog/new-entry.py
+++ b/scripts/changelog/new-entry.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
 """
 Create new changelog entries for a specific package.
 """
diff --git a/scripts/changelog/new-release.py b/scripts/changelog/new-release.py
index bdc7d4315..7b004221b 100755
--- a/scripts/changelog/new-release.py
+++ b/scripts/changelog/new-release.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
 """
 Create a new release by consolidating changelog entries from next-release directory
 into a version JSON file (x.y.z.json).
diff --git a/scripts/changelog/render.py b/scripts/changelog/render.py
index 263058ab8..3164d6622 100755
--- a/scripts/changelog/render.py
+++ b/scripts/changelog/render.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
 """
 Render changelog entries from version JSON files using Jinja templates.
 """

From 5020b8b3892adc317d03f9b8c144d5fbe6f117c6 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Tue, 9 Sep 2025 13:38:00 -0400
Subject: [PATCH 14/18] Address typos and formatting issues

---
 packages/aws-sdk-signers/.changes/0.0.1.json           |  4 ++--
 packages/aws-sdk-signers/.changes/0.0.2.json           |  2 +-
 packages/aws-sdk-signers/.changes/0.0.3.json           |  4 ++--
 packages/aws-sdk-signers/CHANGELOG.md                  | 10 +++++-----
 .../smithy-core-breaking-20250904131215.json           |  2 +-
 .../smithy-core-breaking-20250904131233.json           |  2 +-
 .../smithy-core-breaking-20250904131302.json           |  2 +-
 7 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/packages/aws-sdk-signers/.changes/0.0.1.json b/packages/aws-sdk-signers/.changes/0.0.1.json
index 0c7c27d56..7d891e704 100644
--- a/packages/aws-sdk-signers/.changes/0.0.1.json
+++ b/packages/aws-sdk-signers/.changes/0.0.1.json
@@ -2,11 +2,11 @@
   "changes": [
     {
       "type": "feature",
-      "description": "Added `SigV4Signer` to sign arbitrary requests sychronously."
+      "description": "Added `SigV4Signer` to sign arbitrary requests synchronously."
     },
     {
       "type": "feature",
-      "description": "Added `AsyncSigV4Signer` to sign arbitrary requests asychronously."
+      "description": "Added `AsyncSigV4Signer` to sign arbitrary requests asynchronously."
     },
     {
       "type": "feature",
diff --git a/packages/aws-sdk-signers/.changes/0.0.2.json b/packages/aws-sdk-signers/.changes/0.0.2.json
index 5983e0afb..a78d90795 100644
--- a/packages/aws-sdk-signers/.changes/0.0.2.json
+++ b/packages/aws-sdk-signers/.changes/0.0.2.json
@@ -2,7 +2,7 @@
   "changes": [
     {
       "type": "feature",
-      "description": "Added new `content_checksum_enabled` parameter to SigV4SigningProperties. This will enable users to control the inclusion of the `X-Amz-Content-SHA256` header required by S3. This is disabled by _default_, so you will need to set this to `True` for any S3 requests."
+      "description": "Added new `content_checksum_enabled` parameter to `SigV4SigningProperties`. This will enable users to control the inclusion of the `X-Amz-Content-SHA256` header required by S3. This is disabled by _default_, so you will need to set this to `True` for any S3 requests."
     },
     {
       "type": "bugfix",
diff --git a/packages/aws-sdk-signers/.changes/0.0.3.json b/packages/aws-sdk-signers/.changes/0.0.3.json
index 50b398eaf..b72189bfc 100644
--- a/packages/aws-sdk-signers/.changes/0.0.3.json
+++ b/packages/aws-sdk-signers/.changes/0.0.3.json
@@ -2,11 +2,11 @@
   "changes": [
     {
       "type": "feature",
-      "description": "Added AsyncEventSigner for Amazon Event Stream event signing."
+      "description": "Added `AsyncEventSigner` for Amazon Event Stream event signing."
     },
     {
       "type": "feature",
-      "description": "Added new `uri_encode_path` parameter to SigV4SigningProperties. This boolean can be toggled to double encode the URI path."
+      "description": "Added new `uri_encode_path` parameter to `SigV4SigningProperties`. This boolean can be toggled to double encode the URI path."
     },
     {
       "type": "bugfix",
diff --git a/packages/aws-sdk-signers/CHANGELOG.md b/packages/aws-sdk-signers/CHANGELOG.md
index 263b03fdd..e9da8fcbe 100644
--- a/packages/aws-sdk-signers/CHANGELOG.md
+++ b/packages/aws-sdk-signers/CHANGELOG.md
@@ -3,8 +3,8 @@
 ## v0.0.3
 
 ### Features
-* Added AsyncEventSigner for Amazon Event Stream event signing.
-* Added new `uri_encode_path` parameter to SigV4SigningProperties. This boolean can be toggled to double encode the URI path.
+* Added `AsyncEventSigner` for Amazon Event Stream event signing.
+* Added new `uri_encode_path` parameter to `SigV4SigningProperties`. This boolean can be toggled to double encode the URI path.
 
 ### Bug fixes
 * Fixed bug with async seekable payloads on requests.
@@ -13,7 +13,7 @@
 ## v0.0.2
 
 ### Features
-* Added new `content_checksum_enabled` parameter to SigV4SigningProperties. This will enable users to control the inclusion of the `X-Amz-Content-SHA256` header required by S3. This is disabled by _default_, so you will need to set this to `True` for any S3 requests.
+* Added new `content_checksum_enabled` parameter to `SigV4SigningProperties`. This will enable users to control the inclusion of the `X-Amz-Content-SHA256` header required by S3. This is disabled by _default_, so you will need to set this to `True` for any S3 requests.
 
 ### Bug fixes
 * Fixed incorrect exclusion of `X-Amz-Content-SHA256` header from some requests.
@@ -21,8 +21,8 @@
 ## v0.0.1
 
 ### Features
-* Added `SigV4Signer` to sign arbitrary requests sychronously.
-* Added `AsyncSigV4Signer` to sign arbitrary requests asychronously.
+* Added `SigV4Signer` to sign arbitrary requests synchronously.
+* Added `AsyncSigV4Signer` to sign arbitrary requests asynchronously.
 * Added example `SigV4Auth` for integrating directly with Requests' `auth` parameter.
 * Added `SigV4Signer` for integrating with the AIOHTTP request workflow.
 * Added `SigV4Curl` for generating signed curl commands.
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json
index d2671b952..a716f9a35 100644
--- a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json
+++ b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131215.json
@@ -1,4 +1,4 @@
 {
   "type": "breaking",
-  "description": "Updated retry interfaces to pull information from exceptions instead of requriing a separate classification step."
+  "description": "Updated retry interfaces to pull information from exceptions instead of requiring a separate classification step."
 }
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json
index f666a9d79..406e733a1 100644
--- a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json
+++ b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131233.json
@@ -1,4 +1,4 @@
 {
   "type": "breaking",
-  "description": "Introduced transport-agnostic interfaces for identiy and auth, replacing the existing interfaces that were coupled to HTTP requests and responses."
+  "description": "Introduced transport-agnostic interfaces for identity and auth, replacing the existing interfaces that were coupled to HTTP requests and responses."
 }
\ No newline at end of file
diff --git a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json
index b2b3cefc8..ceaa96164 100644
--- a/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json
+++ b/packages/smithy-core/.changes/next-release/smithy-core-breaking-20250904131302.json
@@ -1,4 +1,4 @@
 {
   "type": "breaking",
-  "description": "Replaced  suffix with  to follow PEP8 conventions."
+  "description": "Replaced `Exception` suffix with `Error` to follow PEP8 conventions."
 }
\ No newline at end of file

From 9163e73d765da74080e4e7708851e85278bc0be1 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Tue, 9 Sep 2025 13:46:26 -0400
Subject: [PATCH 15/18] Remove summary feature

---
 scripts/changelog/new-release.py    | 12 ++----------
 scripts/changelog/render.py         |  1 -
 scripts/changelog/templates/PACKAGE |  4 ----
 3 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/scripts/changelog/new-release.py b/scripts/changelog/new-release.py
index 7b004221b..e1819fab8 100755
--- a/scripts/changelog/new-release.py
+++ b/scripts/changelog/new-release.py
@@ -47,7 +47,6 @@ def create_version_file(
     changes_dir: Path,
     version: str,
     changes: list[dict[str, Any]],
-    summary: str | None = None,
 ) -> Path:
     version_file = changes_dir / f"{version}.json"
 
@@ -57,9 +56,6 @@ def create_version_file(
 
     version_data: dict[str, Any] = {"changes": changes}
 
-    if summary:
-        version_data["summary"] = summary
-
     with open(version_file, "w") as f:
         json.dump(version_data, f, indent=2)
 
@@ -80,9 +76,7 @@ def cleanup_next_release_dir(next_release_dir: Path) -> int:
     return removed_count
 
 
-def create_new_release(
-    package_name: str, version: str, summary: str | None = None, dry_run: bool = False
-) -> int:
+def create_new_release(package_name: str, version: str, dry_run: bool = False) -> int:
     # Get package directories
     changes_dir = PROJECT_ROOT_DIR / "packages" / package_name / ".changes"
     next_release_dir = changes_dir / "next-release"
@@ -113,7 +107,7 @@ def create_new_release(
 
     # Create version file
     try:
-        version_file = create_version_file(changes_dir, version, changes, summary)
+        version_file = create_version_file(changes_dir, version, changes)
         print(f"\nCreated version file: {version_file}")
     except Exception as e:
         print(f"Error creating version file: {e}")
@@ -135,7 +129,6 @@ def main() -> int:
     parser.add_argument(
         "-v", "--version", required=True, help="Release version (e.g., 1.0.0)"
     )
-    parser.add_argument("-s", "--summary", help="Optional release summary")
     parser.add_argument(
         "--dry-run",
         action="store_true",
@@ -153,7 +146,6 @@ def main() -> int:
     return create_new_release(
         package_name=args.package,
         version=args.version,
-        summary=args.summary,
         dry_run=args.dry_run,
     )
 
diff --git a/scripts/changelog/render.py b/scripts/changelog/render.py
index 3164d6622..c0eaf0ea4 100755
--- a/scripts/changelog/render.py
+++ b/scripts/changelog/render.py
@@ -55,7 +55,6 @@ def load_package_releases(changes_dir: Path) -> dict[str, dict[str, Any]]:
             ]
 
             releases[version_number] = {
-                "summary": data.get("summary", ""),
                 "changes": formatted_changes,
             }
         except (OSError, json.JSONDecodeError) as e:
diff --git a/scripts/changelog/templates/PACKAGE b/scripts/changelog/templates/PACKAGE
index e74caf869..d037d61b0 100644
--- a/scripts/changelog/templates/PACKAGE
+++ b/scripts/changelog/templates/PACKAGE
@@ -1,10 +1,6 @@
 # Changelog
 {% for release, changes in releases %}
 ## v{{ release }}
-{%- if changes.summary %}
-
-{{ changes.summary }}
-{%- endif %}
 {%- for type_name in ['breaking', 'feature', 'enhancement', 'bugfix'] %}
 {%- for change in changes.changes if change.type == type_name %}
 {%- if loop.first %}

From c09cb4e43abe911f1a941f80cac175a09ab13e36 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Tue, 9 Sep 2025 14:09:04 -0400
Subject: [PATCH 16/18] Make version checks more consistent

---
 scripts/changelog/new-release.py | 5 +++--
 scripts/changelog/render.py      | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/scripts/changelog/new-release.py b/scripts/changelog/new-release.py
index e1819fab8..94cabcfa6 100755
--- a/scripts/changelog/new-release.py
+++ b/scripts/changelog/new-release.py
@@ -8,11 +8,13 @@
 
 import argparse
 import json
+import re
 import sys
 from pathlib import Path
 from typing import Any
 
 PROJECT_ROOT_DIR = Path(__file__).resolve().parent.parent.parent
+VERSION_PATTERN = r"^\d+\.\d+\.\d+$"
 
 
 def collect_next_release_changes(next_release_dir: Path) -> list[dict[str, Any]]:
@@ -138,8 +140,7 @@ def main() -> int:
     args = parser.parse_args()
 
     # Basic version format validation
-    version_parts = args.version.split(".")
-    if len(version_parts) != 3 or not all(part.isdigit() for part in version_parts):
+    if not bool(re.match(VERSION_PATTERN, args.version)):
         print("Error: Version must be in format x.y.z (e.g., 1.2.3)")
         return 1
 
diff --git a/scripts/changelog/render.py b/scripts/changelog/render.py
index c0eaf0ea4..c1a4131a5 100755
--- a/scripts/changelog/render.py
+++ b/scripts/changelog/render.py
@@ -18,12 +18,12 @@
 
 TEMPLATES_DIR = PROJECT_ROOT_DIR / "scripts" / "changelog" / "templates"
 DEFAULT_TEMPLATE_NAME = "PACKAGE"
-VERSION_PATTERN = r"^\d+\.\d+\.\d+\.json$"
+VERSION_FILE_PATTERN = r"^\d+\.\d+\.\d+\.json$"
 
 
 def get_sorted_versions(changes_dir: Path) -> list[str]:
     """Get sorted list of version numbers from .changes directory."""
-    version_pattern = re.compile(VERSION_PATTERN)
+    version_pattern = re.compile(VERSION_FILE_PATTERN)
     versions: list[str] = []
 
     for file in changes_dir.iterdir():

From b1741df78aca57a266581db5fb51d29db96de5bc Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Thu, 11 Sep 2025 14:45:00 -0400
Subject: [PATCH 17/18] Fix implementation spelling typos

---
 designs/serialization.md                                        | 2 +-
 .../next-release/smithy-aws-core-feature-20250904125834.json    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/designs/serialization.md b/designs/serialization.md
index 10858849b..db11bde7b 100644
--- a/designs/serialization.md
+++ b/designs/serialization.md
@@ -45,7 +45,7 @@ class ImplicitImplementation:
         return f"Good day to you {name}."
 ```
 
-Since this is *structural* subtyping, it isn't required that implmentations
+Since this is *structural* subtyping, it isn't required that implementations
 actual inheret from the `Protocol` or otherwise declare that they're
 implementing it. But they *can* to make it more explicit or to inherit a default
 implementation. The `Protocol` class itself cannot be instantiated, however.
diff --git a/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json b/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json
index 3d6ae9ef0..01e81cfab 100644
--- a/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json
+++ b/packages/smithy-aws-core/.changes/next-release/smithy-aws-core-feature-20250904125834.json
@@ -1,4 +1,4 @@
 {
   "type": "feature",
-  "description": "Added a hand-written implmentation for the `restJson1` protocol."
+  "description": "Added a hand-written implementation for the `restJson1` protocol."
 }
\ No newline at end of file

From 91016b8a68073f8fef91a256937e461a8298e218 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Fri, 12 Sep 2025 14:52:10 -0400
Subject: [PATCH 18/18] Validate change type and description existence and
 values

---
 scripts/changelog/new-release.py | 34 +++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/scripts/changelog/new-release.py b/scripts/changelog/new-release.py
index 94cabcfa6..df4ef534e 100755
--- a/scripts/changelog/new-release.py
+++ b/scripts/changelog/new-release.py
@@ -15,6 +15,23 @@
 
 PROJECT_ROOT_DIR = Path(__file__).resolve().parent.parent.parent
 VERSION_PATTERN = r"^\d+\.\d+\.\d+$"
+CHANGE_TYPES_ORDER = {"breaking": 0, "feature": 1, "enhancement": 2, "bugfix": 3}
+CHANGE_TYPES = tuple(CHANGE_TYPES_ORDER.keys())
+
+
+def validate_change_entry(change_data: dict[str, Any], entry_file: Path) -> bool:
+    if "type" not in change_data or change_data["type"] not in CHANGE_TYPES:
+        print(
+            f"Error: Missing or invalid 'type' field in {entry_file}\n"
+            f"Type must be one of: {CHANGE_TYPES}"
+        )
+        return False
+
+    if "description" not in change_data or not change_data["description"]:
+        print(f"Error: Missing or empty 'description' field in {entry_file}")
+        return False
+
+    return True
 
 
 def collect_next_release_changes(next_release_dir: Path) -> list[dict[str, Any]]:
@@ -28,19 +45,18 @@ def collect_next_release_changes(next_release_dir: Path) -> list[dict[str, Any]]
             try:
                 with open(entry_file) as f:
                     change_data = json.load(f)
+
+                    # Validate required fields
+                    if not validate_change_entry(change_data, entry_file):
+                        sys.exit(1)
+
                     changes.append(change_data)
             except (OSError, json.JSONDecodeError) as e:
-                print(f"Warning: Could not process {entry_file}: {e}", file=sys.stderr)
-                continue
+                print(f"Error: Could not process {entry_file}: {e}", file=sys.stderr)
+                sys.exit(1)
 
     # Sort changes by type for consistent ordering
-    type_order = {"breaking": 0, "feature": 1, "enhancement": 2, "bugfix": 3}
-    changes.sort(
-        key=lambda c: (
-            type_order.get(c.get("type", "enhancement"), 4),
-            c.get("description", ""),
-        )
-    )
+    changes.sort(key=lambda c: (CHANGE_TYPES_ORDER[c["type"]]))
 
     return changes