diff --git a/.changeset/pre.json b/.changeset/pre.json
index 79e8a5858..f93d11f1d 100644
--- a/.changeset/pre.json
+++ b/.changeset/pre.json
@@ -61,6 +61,7 @@
     "curvy-hounds-validate",
     "declared-test-kit-resolution",
     "durable-webhook-registrations",
+    "expose-buyer-reason-on-adcp-error-info",
     "fail-closed-task-webhook-handoffs",
     "fair-dragons-settle",
     "fair-hosts-listen",
@@ -118,6 +119,7 @@
     "smart-otters-repair-beta",
     "steady-bundles-generate",
     "steady-hooks-authorize",
+    "strict-brand-domains",
     "strict-reporting-file-manifest",
     "strict-storyboards-open-scenarios",
     "strong-tasks-cut-over",
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ccfd2f62..86ca2262b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## 14.0.0-rc.34
+
+### Minor Changes
+
+- a8960a5: Expose the AdCP 3.2 `error.buyer_reason` sub-object on the client-facing error surfaces.
+  - `AdcpErrorInfo.buyer_reason` and `ExtractedAdcpError.buyer_reason` now carry the buyer-safe `{ code, message }` when the producer populated it. `buildExtracted`, `extractAdcpErrorInfo`, and `extractAdcpErrorFromMcp` / `extractAdcpErrorFromTransport` all forward it; partial payloads (missing `code` or `message`, empty strings, non-object values) are dropped rather than surfaced as half-typed values a caller might render to a buyer.
+  - `AdcpStructuredError.buyer_reason` and `AdcpError` constructor option added so seller-side adopters can throw a coarse top-level code with a specific buyer-actionable classification. `adcpError()` (via `AdcpErrorOptions`) now accepts and emits `buyer_reason`; the framework's sync-throw projection (`projectThrownAdcpError`) and the two-layer error dispatcher (`sanitizePayloadError`, `PAYLOAD_ERROR_FIELDS`) both carry the field through to the wire. `BuyerRetryPolicy` overrides receive the field on the `error` argument and can key retry decisions on `error.buyer_reason?.code`; the default policy is unchanged — routing on `buyer_reason` is opt-in via override.
+  - `NormalizedError` and `normalizeError()` (`@adcp/sdk/server`) now carry `buyer_reason` too, so adopters projecting per-row batch errors through `normalizeErrors()` (`sync_creatives`, `sync_audiences`, `sync_accounts`, `report_usage`, `acquire_rights`) don't silently lose the field between their row objects and the wire.
+  - The `IDEMPOTENCY_CONFLICT` / `IDEMPOTENCY_IN_FLIGHT` envelope allowlists still strip `buyer_reason` — those wire-shape-restricted codes intentionally never carry a buyer-actionable classification.
+
+- 15c8ee8: Add Public Suffix List-backed BrandRef domain validation with explicit, narrow development-domain exceptions.
+
 ## 14.0.0-rc.33
 
 ### Minor Changes
diff --git a/docs/TYPE-SUMMARY.md b/docs/TYPE-SUMMARY.md
index d604b1ff3..89f8155ce 100644
--- a/docs/TYPE-SUMMARY.md
+++ b/docs/TYPE-SUMMARY.md
@@ -1,7 +1,7 @@
 # AdCP Type Summary
 
-> Generated at: 2026-09-07
-> @adcp/sdk v14.0.0-rc.33
+> Generated at: 2026-09-08
+> @adcp/sdk v14.0.0-rc.34
 
 Curated reference of the types that matter for using the AdCP client. For full generated types see `src/lib/types/tools.generated.ts` and `src/lib/types/core.generated.ts`.
 
diff --git a/docs/llms.txt b/docs/llms.txt
index c45ece1de..7a78ee49f 100644
--- a/docs/llms.txt
+++ b/docs/llms.txt
@@ -1,7 +1,7 @@
 # Ad Context Protocol (AdCP)
 
-> Generated at: 2026-09-07
-> Library: @adcp/sdk v14.0.0-rc.33
+> Generated at: 2026-09-08
+> Library: @adcp/sdk v14.0.0-rc.34
 > AdCP major version: 3
 > Canonical URL: https://adcontextprotocol.github.io/adcp-client/llms.txt
 > Note: the `Library` stamp reflects the package.json version at doc-generation time. The narrative below describes the surface that lands on the next-published minor — including any 6.7 helpers documented here ahead of the release tag.
diff --git a/package-lock.json b/package-lock.json
index 73a6395d7..ec485e9fc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@adcp/sdk",
-  "version": "14.0.0-rc.33",
+  "version": "14.0.0-rc.34",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@adcp/sdk",
-      "version": "14.0.0-rc.33",
+      "version": "14.0.0-rc.34",
       "license": "Apache-2.0",
       "workspaces": [
         ".",
@@ -8666,7 +8666,7 @@
       "version": "6.0.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@adcp/sdk": "^14.0.0-rc.33"
+        "@adcp/sdk": "^14.0.0-rc.34"
       },
       "bin": {
         "adcp": "bin/adcp.js"
diff --git a/package.json b/package.json
index 1bd4bf47c..bb1602b76 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adcp/sdk",
-  "version": "14.0.0-rc.33",
+  "version": "14.0.0-rc.34",
   "description": "AdCP SDK — client, server, and compliance harnesses for the AdContext Protocol (MCP + A2A)",
   "workspaces": [
     ".",
diff --git a/packages/client-shim/package.json b/packages/client-shim/package.json
index 00f3082a5..14149d9af 100644
--- a/packages/client-shim/package.json
+++ b/packages/client-shim/package.json
@@ -106,7 +106,7 @@
     "LICENSE"
   ],
   "dependencies": {
-    "@adcp/sdk": "^14.0.0-rc.33"
+    "@adcp/sdk": "^14.0.0-rc.34"
   },
   "keywords": [
     "adcp",
diff --git a/src/lib/version.ts b/src/lib/version.ts
index 5218aced8..30e3e5473 100644
--- a/src/lib/version.ts
+++ b/src/lib/version.ts
@@ -4,7 +4,7 @@
 /**
  * AdCP SDK library version
  */
-export const LIBRARY_VERSION = '14.0.0-rc.33';
+export const LIBRARY_VERSION = '14.0.0-rc.34';
 
 /**
  * AdCP specification version this library is built for
@@ -99,10 +99,10 @@ export type AdcpVersion = (typeof COMPATIBLE_ADCP_VERSIONS)[number];
  * Full version information
  */
 export const VERSION_INFO = {
-  library: '14.0.0-rc.33',
+  library: '14.0.0-rc.34',
   adcp: '3.2.0-rc.1',
   compatibleVersions: COMPATIBLE_ADCP_VERSIONS,
-  generatedAt: '2026-09-07T02:06:48.151Z',
+  generatedAt: '2026-09-08T11:31:49.294Z',
 } as const;
 
 /**