diff --git a/skills/adamantite/SKILL.md b/skills/adamantite/SKILL.md
index 57c5042e..5f990753 100644
--- a/skills/adamantite/SKILL.md
+++ b/skills/adamantite/SKILL.md
@@ -9,6 +9,7 @@ sources:
   - "adelrodriguez/adamantite:src/cli.ts"
   - "adelrodriguez/adamantite:src/commands/*.ts"
   - "adelrodriguez/adamantite:src/lib/workspace/custom-rules/index.ts"
+  - "adelrodriguez/adamantite:src/lib/workspace/custom-rules/stub.ts.template"
 ---
 
 # Adamantite
diff --git a/src/__tests__/presets/custom.test.ts b/src/__tests__/presets/custom.test.ts
index 575a89aa..77d2bbf4 100644
--- a/src/__tests__/presets/custom.test.ts
+++ b/src/__tests__/presets/custom.test.ts
@@ -6,6 +6,7 @@ import { afterEach, beforeEach, describe, expect, it } from "@effect/vitest"
 import * as EffectArray from "effect/Array"
 import * as Order from "effect/Order"
 import * as Schema from "effect/Schema"
+import { toCustomRuleStub } from "#lib/workspace/custom-rules/index.ts"
 
 const REPO_ROOT = join(import.meta.dirname, "../../..")
 const CUSTOM_PRESET = join(REPO_ROOT, "presets/lint/custom.ts")
@@ -107,6 +108,19 @@ describe("custom preset", () => {
     expect(lint("src")).toStrictEqual(["project(no-debugger-here):error"])
   })
 
+  it("load and run the stub that rule add writes", () => {
+    write(
+      ".adamantite/rules/no-debugger-here.ts",
+      toCustomRuleStub("no-debugger-here").replace(
+        '"adamantite/rules"',
+        JSON.stringify(RULES_MODULE)
+      )
+    )
+    write("oxlint.config.ts", makeConfig("custom()"))
+
+    expect(lint("src")).toStrictEqual(["project(no-debugger-here):error"])
+  })
+
   it("apply severity overrides from the rules option", () => {
     write(".adamantite/rules/no-debugger-here.ts", makeRule("No debugger here."))
     write("oxlint.config.ts", makeConfig('custom({ rules: { "no-debugger-here": "warn" } })'))
diff --git a/src/lib/workspace/custom-rules/index.ts b/src/lib/workspace/custom-rules/index.ts
index e4d4d82e..34eb65f8 100644
--- a/src/lib/workspace/custom-rules/index.ts
+++ b/src/lib/workspace/custom-rules/index.ts
@@ -3,6 +3,9 @@ import * as FileSystem from "effect/FileSystem"
 import * as Path from "effect/Path"
 import { CustomRuleExists, FailedToReadFile, InvalidRuleName } from "#lib/shared/errors.ts"
 import { ensureDirectory, writeFile } from "#lib/shared/filesystem.ts"
+import { getStubTemplate } from "#lib/workspace/custom-rules/stub.macro.ts" with { type: "macro" }
+
+const stubTemplate = getStubTemplate()
 
 /**
  * The rules folder that `custom()` loads when no `dir` is given, relative to the file that calls
@@ -16,25 +19,7 @@ const RULE_NAME_PATTERN = /^[a-z][\da-z]*(?:-[\da-z]+)*$/
  * The stub that `adamantite rule add` writes: a working rule that the author replaces.
  */
 export function toCustomRuleStub(name: string): string {
-  return `import { defineRule } from "adamantite/rules"
-
-export default defineRule({
-  meta: {
-    docs: { description: "TODO: describe what ${name} reports." },
-    messages: { unexpected: "TODO: tell the author what to do instead." },
-    schema: [],
-    type: "problem",
-  },
-  createOnce(context) {
-    return {
-      // Run \`adamantite rule ast <file>\` to find the node types to visit.
-      DebuggerStatement(node) {
-        context.report({ messageId: "unexpected", node })
-      },
-    }
-  },
-})
-`
+  return stubTemplate.replaceAll("{{name}}", name)
 }
 
 /**
diff --git a/src/lib/workspace/custom-rules/stub.macro.ts b/src/lib/workspace/custom-rules/stub.macro.ts
new file mode 100644
index 00000000..db6eb76a
--- /dev/null
+++ b/src/lib/workspace/custom-rules/stub.macro.ts
@@ -0,0 +1,9 @@
+import { readFileSync } from "node:fs"
+
+/**
+ * Build-time macro that inlines `stub.ts.template` into the bundle, so `rule add` never reads the
+ * template from disk at run time.
+ */
+export function getStubTemplate(): string {
+  return readFileSync(new URL("stub.ts.template", import.meta.url), "utf8")
+}
diff --git a/src/lib/workspace/custom-rules/stub.ts.template b/src/lib/workspace/custom-rules/stub.ts.template
new file mode 100644
index 00000000..4f02b5d9
--- /dev/null
+++ b/src/lib/workspace/custom-rules/stub.ts.template
@@ -0,0 +1,18 @@
+import { defineRule } from "adamantite/rules"
+
+export default defineRule({
+  meta: {
+    docs: { description: "TODO: describe what {{name}} reports." },
+    messages: { unexpected: "TODO: tell the author what to do instead." },
+    schema: [],
+    type: "problem",
+  },
+  createOnce(context) {
+    return {
+      // Run `adamantite rule ast <file>` to find the node types to visit.
+      DebuggerStatement(node) {
+        context.report({ messageId: "unexpected", node })
+      },
+    }
+  },
+})