diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a32900..fe81c66 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,39 @@ All notable changes to `devhelm-mcp-server` are documented here.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.0] — 2026-05-06
+
+First GA release. Cut alongside the `1.0.0` GA of the `devhelm` Python
+SDK, the `devhelm` CLI, and the `@devhelm/sdk` JS/TS SDK. The schema
+and tool surface that `0.8.3` shipped is the GA contract — no
+behavioral changes from `0.8.3`, only the version bump and the SDK
+floor change below.
+
+### Changed
+
+- Bump `devhelm` Python SDK floor to `>=1.0.0`. Aligns with the GA
+  release of the SDK; future patch/minor SDK bumps will be picked up
+  automatically without an explicit floor change here.
+
+### Compatibility
+
+- All tool input schemas, tool names, and response shapes are
+  unchanged from `0.8.3`. Existing clients keep working without
+  modification.
+
+## [0.8.3] — 2026-05-06
+
+### Changed
+
+- Rewrite `initialize.instructions` to point at transport-layer auth
+  (`Authorization: Bearer ...` for hosted, `DEVHELM_API_TOKEN` env for
+  stdio) and explicitly note that tool schemas no longer accept
+  `api_token` arguments. The previous wording ("All operations require
+  a valid DevHelm API token") contradicted the 0.7.0 schema change and
+  caused LLMs to attempt to thread tokens into tool args.
+- Add `CHANGELOG.md` retroactively covering 0.6.0 → 0.8.x. Going
+  forward, every release lands with a corresponding stanza.
+
 ## [0.8.2] — 2026-05-06
 
 ### Changed
diff --git a/pyproject.toml b/pyproject.toml
index a0cbabb..3210db5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,11 +19,14 @@ classifiers = [
 ]
 
 dependencies = [
-    # Floor bumped to 0.7.2: required for `managedBy` field on resource DTOs
-    # and for the new monitor validation contract (frequencySeconds bounds,
-    # dynamic region whitelist). Older devhelm versions raise Pydantic
-    # `extra_forbidden` errors when the API returns `managedBy`.
-    "devhelm>=0.7.2",
+    # Floor bumped to 1.0.0: aligns with the GA release of the Python SDK
+    # cut alongside this server's 1.0.0. The 1.0.0 SDK includes every
+    # contract the server currently relies on (`managedBy` on resource
+    # DTOs, the monitor validation contract — frequencySeconds bounds,
+    # dynamic region whitelist) and commits to semver going forward, so
+    # `>=1.0.0` lets us pull in compatible patch/minor bumps without
+    # explicit floor bumps each time.
+    "devhelm>=1.0.0",
     "fastmcp>=2.0.0",
 ]
 
diff --git a/uv.lock b/uv.lock
index f16f1f9..9ac0894 100644
--- a/uv.lock
+++ b/uv.lock
@@ -388,20 +388,20 @@ wheels = [
 
 [[package]]
 name = "devhelm"
-version = "0.7.2"
+version = "1.0.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
     { name = "pydantic", extra = ["email"] },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/90/5d/b853660ac8f5cfd3662f18b3608fb0c80ce8f7c246a0d66eae6806d0c212/devhelm-0.7.2.tar.gz", hash = "sha256:84e8218a42719799a2166290fcb84b7ed36c0386a41009c028a2c8abf2ff162c", size = 245192, upload-time = "2026-05-06T15:57:36.421Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/10/9b/df5ce6deb9726da8bd461f1151db446d6ebd0dd6e47264f9bfb498ed3f88/devhelm-1.0.0.tar.gz", hash = "sha256:32f6aff4ff483038af0ae91376435935c9d5e2eadb6fb10587b0dd33a7d9b51d", size = 245190, upload-time = "2026-05-06T19:25:29.309Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/2c/e6/74b538b202e4ff01293382af9b2951a1cc0ecdf9c5535b42f8ee919781bc/devhelm-0.7.2-py3-none-any.whl", hash = "sha256:63117a0f7722fa8aa6aa63395c4f08925299dfb9b1442bf62cd40a60f9188d94", size = 78306, upload-time = "2026-05-06T15:57:35.114Z" },
+    { url = "https://files.pythonhosted.org/packages/ad/ab/f76135202042ea1168892d81193294d62d1911087c25731dc46e441efdcf/devhelm-1.0.0-py3-none-any.whl", hash = "sha256:8eb4962f17fe8ee3668dc79cd405200b8294a7d4988a7380505c40aebdad0717", size = 78304, upload-time = "2026-05-06T19:25:28.133Z" },
 ]
 
 [[package]]
 name = "devhelm-mcp-server"
-version = "0.8.1"
+version = "0.8.3"
 source = { editable = "." }
 dependencies = [
     { name = "devhelm" },
@@ -419,7 +419,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "devhelm", specifier = ">=0.7.2" },
+    { name = "devhelm", specifier = ">=1.0.0" },
     { name = "fastmcp", specifier = ">=2.0.0" },
 ]