diff --git a/packages/opencode/src/cli/cmd/github.ts b/packages/opencode/src/cli/cmd/github.ts
index edd9d756109..36ead8660f2 100644
--- a/packages/opencode/src/cli/cmd/github.ts
+++ b/packages/opencode/src/cli/cmd/github.ts
@@ -540,7 +540,12 @@ export const GithubRunCommand = cmd({
         }
         // Skip permission check and reactions for repo events (no actor to check, no issue to react to)
         if (isUserEvent) {
-          await assertPermissions()
+          // Skip permission check when using a custom GitHub token, since the caller
+          // manages their own auth and the collaborator API returns "none" for GitHub
+          // App bot actors (e.g. my-bot[bot]) even though they have valid installation tokens.
+          if (!useGithubToken) {
+            await assertPermissions()
+          }
           await addReaction(commentType)
         }