diff --git a/knip.jsonc b/knip.jsonc
new file mode 100644
index 00000000..001bb230
--- /dev/null
+++ b/knip.jsonc
@@ -0,0 +1,51 @@
+{
+	"$schema": "https://unpkg.com/knip@6.16.1/schema.json",
+	"entry": [
+		"index.ts",
+		"lib/index.ts",
+		"lib/auth/index.ts",
+		"lib/request/index.ts",
+		"lib/codex-cli/index.ts",
+		"lib/ui/index.ts",
+		"scripts/*.{js,mjs}",
+		"test/**/*.test.ts",
+		"test/helpers/**/*.ts"
+	],
+	"project": [
+		"lib/**/*.ts",
+		"scripts/**/*.{js,mjs}",
+		"index.ts",
+		"test/**/*.ts"
+	],
+	"ignore": [
+		"bench/**",
+		"vendor/**",
+		"dist/**",
+		"docs/**"
+	],
+	"ignoreBinaries": [
+		"powershell.exe",
+		"pbcopy",
+		"where"
+	],
+	"ignoreDependencies": [
+		// Editor-only LSP tooling; never imported.
+		"typescript-language-server",
+		// The official Codex CLI this package wraps: resolved from the HOST
+		// install at runtime (scripts/codex-bin-resolver.js), deliberately not
+		// a package.json dependency.
+		"@openai/codex"
+	],
+	// Export/type-level findings are warn-only on purpose: the blocking signal
+	// is unused FILES and DEPENDENCIES. The export backlog was cleared
+	// incrementally (PRs #556/#557, down to two documented keepers); escalate a
+	// rule to "error" once its warning count is intentionally pinned at zero.
+	"rules": {
+		"exports": "warn",
+		"types": "warn",
+		"nsExports": "warn",
+		"nsTypes": "warn",
+		"duplicates": "warn",
+		"enumMembers": "warn"
+	}
+}
diff --git a/package-lock.json b/package-lock.json
index 7f1b6131..32532d57 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -28,7 +28,6 @@
 				"mcodex": "scripts/mcodex.js"
 			},
 			"devDependencies": {
-				"@fast-check/vitest": "^0.2.4",
 				"@types/node": "^20.19.42",
 				"@typescript-eslint/eslint-plugin": "^8.56.0",
 				"@typescript-eslint/parser": "^8.56.0",
@@ -686,29 +685,6 @@
 				"node": "^20.19.0 || ^22.13.0 || >=24"
 			}
 		},
-		"node_modules/@fast-check/vitest": {
-			"version": "0.2.4",
-			"resolved": "https://registry.npmjs.org/@fast-check/vitest/-/vitest-0.2.4.tgz",
-			"integrity": "sha512-Ilcr+JAIPhb1s6FRm4qoglQYSGXXrS+zAupZeNuWAA3qHVGDA1d1Gb84Hb/+otL3GzVZjFJESg5/1SfIvrgssA==",
-			"dev": true,
-			"funding": [
-				{
-					"type": "individual",
-					"url": "https://github.com/sponsors/dubzzz"
-				},
-				{
-					"type": "opencollective",
-					"url": "https://opencollective.com/fast-check"
-				}
-			],
-			"license": "MIT",
-			"dependencies": {
-				"fast-check": "^3.0.0 || ^4.0.0"
-			},
-			"peerDependencies": {
-				"vitest": "^1 || ^2 || ^3 || ^4"
-			}
-		},
 		"node_modules/@humanfs/core": {
 			"version": "0.19.1",
 			"resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
diff --git a/package.json b/package.json
index 916d87a1..edfb5673 100644
--- a/package.json
+++ b/package.json
@@ -156,7 +156,6 @@
 		"node": ">=18.17.0"
 	},
 	"devDependencies": {
-		"@fast-check/vitest": "^0.2.4",
 		"@types/node": "^20.19.42",
 		"@typescript-eslint/eslint-plugin": "^8.56.0",
 		"@typescript-eslint/parser": "^8.56.0",