diff --git a/plugins/brains/.claude-plugin/plugin.json b/plugins/brains/.claude-plugin/plugin.json
index 13a9465..194d8ad 100644
--- a/plugins/brains/.claude-plugin/plugin.json
+++ b/plugins/brains/.claude-plugin/plugin.json
@@ -1,7 +1,7 @@
 {
   "name": "brains",
   "description": "Your memory layer: Gmail, Calendar, Drive, and prior Claude conversations as queryable pages, with reflexive recall, hook-driven turn-by-turn capture and inbox delivery, and boards/automations/workflows on top.",
-  "version": "2.8.1",
+  "version": "2.8.2",
   "author": {
     "name": "brains (ssvlabs)"
   },
diff --git a/plugins/brains/.codex-plugin/plugin.json b/plugins/brains/.codex-plugin/plugin.json
index bf854c3..6398af4 100644
--- a/plugins/brains/.codex-plugin/plugin.json
+++ b/plugins/brains/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "brains",
-  "version": "2.8.1",
+  "version": "2.8.2",
   "description": "Your personal memory layer for Codex: query Gmail, Calendar, Drive, and prior conversations, then build boards, automations, and workflows.",
   "author": {
     "name": "brains (ssvlabs)",
diff --git a/plugins/brains/hooks/claude-hooks.json b/plugins/brains/hooks/claude-hooks.json
index d761545..b5b2f8f 100644
--- a/plugins/brains/hooks/claude-hooks.json
+++ b/plugins/brains/hooks/claude-hooks.json
@@ -2,7 +2,7 @@
   "hooks": {
     "SessionStart": [
       {
-        "matcher": "startup|resume|clear|compact",
+        "matcher": "startup|resume|clear|compact|fork",
         "hooks": [
           {
             "type": "command",
diff --git a/tests/plugin-contract/run.ts b/tests/plugin-contract/run.ts
index 529260d..1670e62 100644
--- a/tests/plugin-contract/run.ts
+++ b/tests/plugin-contract/run.ts
@@ -117,7 +117,7 @@ type HookGroup = {
 const CLAUDE_HOOK_EVENTS: Record<string, HookGroup[]> = {
   SessionStart: [
     {
-      matcher: "startup|resume|clear|compact",
+      matcher: "startup|resume|clear|compact|fork",
       hooks: [
         {
           type: "command",
@@ -986,6 +986,15 @@ for (const [label, source, expected] of [
 // would reject adding them but would report it as a set mismatch; these say why.
 assert(!codexEvents.includes("PostToolUseFailure"), "Codex does not support PostToolUseFailure");
 assert(!codexEvents.includes("SessionEnd"), "Codex does not support SessionEnd");
+// Not a claim about Codex at runtime — a CONFIGURATION pin recording why the two SessionStart
+// matchers above differ, so the asymmetry reads as deliberate rather than as drift. Codex declares
+// four SessionStart sources and no `fork` (codex-rs/hooks/src/events/session_start.rs); a forked
+// Codex thread arrives as `startup` or `resume` depending on the fork path, and both are already
+// matched. `fork` is Claude vocabulary only.
+assert(
+  !(codexHooks.hooks.SessionStart[0].matcher ?? "").split("|").includes("fork"),
+  "Codex declares no fork SessionStart source — a forked Codex thread arrives as startup or resume, so `fork` here would pin a value Codex never emits",
+);
 
 for (const command of [...hookScripts(claudeHooks), ...hookScripts(codexHooks)]) {
   const match = command.match(/hooks\/(brains-[a-z-]+\.sh)/);