diff --git a/.agents/skills/impeccable/scripts/cleanup-deprecated.mjs b/.agents/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.agents/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.agents/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.claude/skills/impeccable/scripts/cleanup-deprecated.mjs b/.claude/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.claude/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.claude/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.cursor/skills/impeccable/scripts/cleanup-deprecated.mjs b/.cursor/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.cursor/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.cursor/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.gemini/skills/impeccable/scripts/cleanup-deprecated.mjs b/.gemini/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.gemini/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.gemini/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.github/skills/impeccable/scripts/cleanup-deprecated.mjs b/.github/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.github/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.github/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.kiro/skills/impeccable/scripts/cleanup-deprecated.mjs b/.kiro/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.kiro/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.kiro/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.opencode/skills/impeccable/scripts/cleanup-deprecated.mjs b/.opencode/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.opencode/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.opencode/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.pi/skills/impeccable/scripts/cleanup-deprecated.mjs b/.pi/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.pi/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.pi/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.qoder/skills/impeccable/scripts/cleanup-deprecated.mjs b/.qoder/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.qoder/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.qoder/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.rovodev/skills/impeccable/scripts/cleanup-deprecated.mjs b/.rovodev/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.rovodev/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.rovodev/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.trae-cn/skills/impeccable/scripts/cleanup-deprecated.mjs b/.trae-cn/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.trae-cn/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.trae-cn/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/.trae/skills/impeccable/scripts/cleanup-deprecated.mjs b/.trae/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/.trae/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/.trae/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/bin/commands/skills.mjs b/bin/commands/skills.mjs
index 1029605e..9289933e 100644
--- a/bin/commands/skills.mjs
+++ b/bin/commands/skills.mjs
@@ -19,8 +19,10 @@ import { tmpdir } from 'node:os';
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const API_BASE = 'https://impeccable.style';
 
-// Provider folder names in project roots
-const PROVIDER_DIRS = ['.claude', '.cursor', '.gemini', '.agents', '.github', '.kiro', '.opencode', '.pi', '.qoder', '.trae', '.trae-cn'];
+// Provider folder names in project roots.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js
+// (.codex is intentionally excluded -- Codex CLI consumes .agents/skills/).
+const PROVIDER_DIRS = ['.claude', '.cursor', '.gemini', '.agents', '.github', '.kiro', '.opencode', '.pi', '.qoder', '.rovodev', '.trae', '.trae-cn'];
 
 function ask(question) {
   const rl = createInterface({ input: process.stdin, output: process.stdout });
diff --git a/plugin/skills/impeccable/scripts/cleanup-deprecated.mjs b/plugin/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/plugin/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/plugin/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/source/skills/impeccable/scripts/cleanup-deprecated.mjs b/source/skills/impeccable/scripts/cleanup-deprecated.mjs
index 6aee4710..f079b8b6 100644
--- a/source/skills/impeccable/scripts/cleanup-deprecated.mjs
+++ b/source/skills/impeccable/scripts/cleanup-deprecated.mjs
@@ -52,9 +52,11 @@ const DEPRECATED_NAMES = [
 ];
 
 // All known harness directories that may contain a skills/ subfolder.
+// Must stay in sync with configDir entries in scripts/lib/transformers/providers.js.
 const HARNESS_DIRS = [
   '.claude', '.cursor', '.gemini', '.codex', '.agents',
-  '.trae', '.trae-cn', '.pi', '.opencode', '.kiro', '.rovodev',
+  '.github', '.trae', '.trae-cn', '.pi', '.opencode',
+  '.kiro', '.qoder', '.rovodev',
 ];
 
 // Per-skill fingerprints for SKILL.md bodies that never mentioned
diff --git a/tests/cleanup-deprecated.test.mjs b/tests/cleanup-deprecated.test.mjs
index 9d4dfb77..6ffcaa48 100644
--- a/tests/cleanup-deprecated.test.mjs
+++ b/tests/cleanup-deprecated.test.mjs
@@ -167,6 +167,19 @@ describe('cleanup-deprecated', () => {
       assert.equal(deleted.length, 3);
     });
 
+    it('cleans GitHub Copilot and Qoder harness installs', () => {
+      // Regression: HARNESS_DIRS used to omit .github and .qoder, so users
+      // who installed via those harnesses kept stale skill directories
+      // forever. providers.js declares both as build targets, so they need
+      // to round-trip through cleanup as well.
+      writeSkill(tmp, '.github', 'arrange', 'Invoke /impeccable first.');
+      writeSkill(tmp, '.qoder', 'normalize', 'Run impeccable teach.');
+      const deleted = removeDeprecatedSkills(tmp);
+      assert.equal(deleted.length, 2);
+      assert.equal(existsSync(join(tmp, '.github', 'skills', 'arrange')), false);
+      assert.equal(existsSync(join(tmp, '.qoder', 'skills', 'normalize')), false);
+    });
+
     it('leaves non-deprecated skills alone', () => {
       writeSkill(tmp, '.claude', 'my-custom-skill', 'Invoke /impeccable first.');
       writeSkill(tmp, '.claude', 'arrange', 'Invoke /impeccable first.');