diff --git a/opencode-plugin/src/index.ts b/opencode-plugin/src/index.ts
index d762e89..4a81ea8 100644
--- a/opencode-plugin/src/index.ts
+++ b/opencode-plugin/src/index.ts
@@ -266,21 +266,22 @@ const MnemosynePlugin: Plugin = async (ctx: PluginInput): Promise<Hooks> => {
         }
       }
 
-      // Inject baseURL for the Anthropic provider
-      // This routes all Anthropic API calls through the Mnemosyne gateway
+      // Inject baseURL for the Mnemosyne provider only.
+      // Keep provider ID `anthropic` untouched so Claude Code OAuth and
+      // oh-my-opencode variants continue to work against direct Anthropic.
       inputConfig.provider = inputConfig.provider ?? {};
-      inputConfig.provider.anthropic = inputConfig.provider.anthropic ?? {};
-      inputConfig.provider.anthropic.options =
-        inputConfig.provider.anthropic.options ?? {};
+      inputConfig.provider.mnemosyne = inputConfig.provider.mnemosyne ?? {};
+      inputConfig.provider.mnemosyne.options =
+        inputConfig.provider.mnemosyne.options ?? {};
 
       // Only set if not already overridden by user
-      if (!inputConfig.provider.anthropic.options.baseURL) {
+      if (!inputConfig.provider.mnemosyne.options.baseURL) {
         // Anthropic SDK appends /messages to baseURL, so we need /v1 suffix
-        inputConfig.provider.anthropic.options.baseURL = `${gateway.url}/v1`;
-        log.info(`Routing Anthropic through gateway at ${gateway.url}/v1`);
+        inputConfig.provider.mnemosyne.options.baseURL = `${gateway.url}/v1`;
+        log.info(`Routing Mnemosyne through gateway at ${gateway.url}/v1`);
       } else {
         log.debug(
-          `baseURL already set to ${inputConfig.provider.anthropic.options.baseURL}, not overriding`
+          `baseURL already set to ${inputConfig.provider.mnemosyne.options.baseURL}, not overriding`
         );
       }
     },