diff --git a/packages/plugin/src/hooks/magic-context/hook.ts b/packages/plugin/src/hooks/magic-context/hook.ts
index 43bb20a00..228248548 100644
--- a/packages/plugin/src/hooks/magic-context/hook.ts
+++ b/packages/plugin/src/hooks/magic-context/hook.ts
@@ -178,6 +178,10 @@ export interface MagicContextDeps {
             min_chars: number;
         };
         transform_mode?: ResolvedTransformMode;
+        /** Path to the subc daemon's connection file. Threaded to the module
+         *  transport so a host that publishes it outside the default data-dir
+         *  location (e.g. a systemd RuntimeDirectory) is actually reachable. */
+        subc?: { connection_file: string };
         /** Compaction-off mode gate (issue #266). Resolved ONCE here at the
          *  session-hook construction boundary via isCompactionEnabled; the
          *  resolved boolean is threaded to the transform phases. */
@@ -774,7 +778,7 @@ export function createMagicContextHook(deps: MagicContextDeps) {
     const authorityRecoveryModuleClient =
         deps.rustModeModuleClient ??
         (() => {
-            const transport = new SubcModuleTransport();
+            const transport = new SubcModuleTransport(deps.config.subc?.connection_file);
             const client: RustModeModuleClient = {
                 call: (args) => transport.call(args),
                 stateSyncCapabilities: (args) => transport.stateSyncCapabilities(args),
diff --git a/packages/plugin/src/index.ts b/packages/plugin/src/index.ts
index d8e10e1b5..eb1e76712 100644
--- a/packages/plugin/src/index.ts
+++ b/packages/plugin/src/index.ts
@@ -203,7 +203,9 @@ const server: Plugin = async (ctx) => {
 
     const liveSessionState = createLiveSessionState();
     const rustModeModuleClient: RustModeModuleClient | undefined =
-        pluginConfig.transform_mode === "rust" ? new SubcModuleTransport() : undefined;
+        pluginConfig.transform_mode === "rust"
+            ? new SubcModuleTransport(pluginConfig.subc?.connection_file)
+            : undefined;
 
     const hooks = await createSessionHooksAsync({
         ctx,