diff --git a/.gitignore b/.gitignore
index 4daa0658f..2981f224f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,7 @@
 # Dependencies
+.omo/*
+!.omo/rules/
+!.omo/rules/**
 .sisyphus/*
 !.sisyphus/rules/
 !.sisyphus/rules/**
diff --git a/src/hooks/rules-injector/constants.ts b/src/hooks/rules-injector/constants.ts
index 0c07169fe..1d1468460 100644
--- a/src/hooks/rules-injector/constants.ts
+++ b/src/hooks/rules-injector/constants.ts
@@ -15,6 +15,7 @@ export const PROJECT_RULE_SUBDIRS: [string, string][] = [
   [".github", "instructions"],
   [".cursor", "rules"],
   [".claude", "rules"],
+  [".omo", "rules"],
   [".sisyphus", "rules"],
 ];
 
@@ -26,6 +27,6 @@ export const GITHUB_INSTRUCTIONS_PATTERN = /\.instructions\.md$/;
 
 export const USER_RULE_DIR = ".claude/rules";
 
-export const OPENCODE_USER_RULE_DIRS = [".sisyphus/rules", ".opencode/rules"];
+export const OPENCODE_USER_RULE_DIRS = [".omo/rules", ".sisyphus/rules", ".opencode/rules"];
 
 export const RULE_EXTENSIONS = [".md", ".mdc"];
diff --git a/src/hooks/rules-injector/rule-file-scanner.test.ts b/src/hooks/rules-injector/rule-file-scanner.test.ts
index cadf4c3f1..88f152809 100644
--- a/src/hooks/rules-injector/rule-file-scanner.test.ts
+++ b/src/hooks/rules-injector/rule-file-scanner.test.ts
@@ -21,7 +21,7 @@ describe("findRuleFilesRecursive", () => {
     const temporaryDirectory = join(tmpdir(), `perf-d01-${randomUUID()}`);
     createdDirectories.push(temporaryDirectory);
 
-    const rulesDirectory = join(temporaryDirectory, ".sisyphus", "rules");
+    const rulesDirectory = join(temporaryDirectory, ".omo", "rules");
     mkdirSync(join(rulesDirectory, "node_modules", "fake"), { recursive: true });
     mkdirSync(join(rulesDirectory, ".git"), { recursive: true });
     writeFileSync(join(rulesDirectory, "foo.md"), "root rule");
diff --git a/src/shared/excluded-dirs.test.ts b/src/shared/excluded-dirs.test.ts
index 21a488907..fea89380c 100644
--- a/src/shared/excluded-dirs.test.ts
+++ b/src/shared/excluded-dirs.test.ts
@@ -11,6 +11,7 @@ describe("EXCLUDED_DIRS", () => {
       "dist",
       "build",
       ".next",
+      ".omo",
       ".sisyphus",
       ".omx",
       ".turbo",
diff --git a/src/shared/excluded-dirs.ts b/src/shared/excluded-dirs.ts
index 059a01406..f2006a8dc 100644
--- a/src/shared/excluded-dirs.ts
+++ b/src/shared/excluded-dirs.ts
@@ -4,6 +4,7 @@ const EXCLUDED_DIR_NAMES = [
   "dist",
   "build",
   ".next",
+  ".omo",
   ".sisyphus",
   ".omx",
   ".turbo",