diff --git a/src/cli/utilityCommands.ts b/src/cli/utilityCommands.ts
index e84cc46a1e..382c48bba3 100644
--- a/src/cli/utilityCommands.ts
+++ b/src/cli/utilityCommands.ts
@@ -1,5 +1,6 @@
 import { projectCliAnalysisResult } from "./projectCliAnalysisResult.js";
 import { z } from "incur";
+import { cliIntegerArgument } from "./options.js";
 
 import type { DirectAnalysis } from "../composition/directAnalysis.js";
 import type { ReferenceSourcePolicy } from "../domain/referenceSourcePolicy.js";
@@ -288,13 +289,7 @@ const registerReferenceSourceCommand = (
         .describe(
           "Complete committed graph or compact historical-source summary",
         ),
-      outlineDepth: z
-        .number()
-        .int()
-        .safe()
-        // After .safe(): its safe-range check overwrites an earlier minimum,
-        // which advertised negative depths the parser rejects.
-        .nonnegative()
+      outlineDepth: cliIntegerArgument(0)
         .optional()
         .describe(
           "Summary outline path depth (default: 2; 0 omits entries); requires --detail summary",
diff --git a/tests/boundary/cli/cliInputSchemaRequired.test.ts b/tests/boundary/cli/cliInputSchemaRequired.test.ts
index 0764147e61..2c57d1a1ac 100644
--- a/tests/boundary/cli/cliInputSchemaRequired.test.ts
+++ b/tests/boundary/cli/cliInputSchemaRequired.test.ts
@@ -394,25 +394,44 @@ describe("Apktool locale selection input schema", () => {
 });
 
 describe("reference-source outline-depth input schema", () => {
-  it("aligns advertised bounds with the parser's accepted values", async () => {
+  it("parses decimal CLI tokens into the advertised safe integer schema", async () => {
     const cli = createCli({});
     const advertised = await advertisedSchema(cli, "import-reference-source");
     const outlineDepth = advertised.options?.properties?.outlineDepth;
     expect(outlineDepth).toMatchObject({ type: "integer", minimum: 0 });
 
     const parser = parserSchema(cli, "import-reference-source", "options");
-    expect(parser?.safeParse({ outlineDepth: -1 }).success).toBe(false);
-    expect(parser?.safeParse({ outlineDepth: 0 }).success).toBe(true);
-    expect(parser?.safeParse({ outlineDepth: 2 }).success).toBe(true);
+    expect(parser?.safeParse({}).success).toBe(true);
+    const parsedValues = [
+      ["0", 0],
+      ["2", 2],
+      ["02", 2],
+      [String(Number.MAX_SAFE_INTEGER), Number.MAX_SAFE_INTEGER],
+    ] as const;
+    for (const [token, expected] of parsedValues) {
+      const parsed = parser?.safeParse({ outlineDepth: token });
+      expect(parsed?.success).toBe(true);
+      if (parsed === undefined || !parsed.success)
+        throw new Error(`Expected outline-depth token ${token} to parse`);
+      expect(parsed.data).toMatchObject({ outlineDepth: expected });
+    }
+    for (const token of ["", "-1", "9007199254740992"]) {
+      expect(parser?.safeParse({ outlineDepth: token }).success).toBe(false);
+    }
 
     const ajv = new Ajv2020({ strict: false });
     const validate = ajv.compile({
       ...advertised.options,
       $schema: "https://json-schema.org/draft/2020-12/schema",
     });
+    for (const [token] of parsedValues) {
+      const parsed = parser?.safeParse({ outlineDepth: token });
+      if (parsed === undefined || !parsed.success)
+        throw new Error(`Expected outline-depth token ${token} to parse`);
+      expect(validate(parsed.data)).toBe(true);
+    }
     expect(validate({ outlineDepth: -1 })).toBe(false);
-    expect(validate({ outlineDepth: 0 })).toBe(true);
-    expect(validate({ outlineDepth: 2 })).toBe(true);
+    expect(validate({ outlineDepth: 9007199254740992 })).toBe(false);
   });
 });
 
diff --git a/tests/boundary/cli/referenceSourceSummary.test.ts b/tests/boundary/cli/referenceSourceSummary.test.ts
index ba5398a866..b0cc69d5cf 100644
--- a/tests/boundary/cli/referenceSourceSummary.test.ts
+++ b/tests/boundary/cli/referenceSourceSummary.test.ts
@@ -58,11 +58,22 @@ describe.skipIf(process.platform === "win32")(
           manifest_id: `hsm_${createHash("sha256").update(semanticJson).digest("hex")}`,
         };
         expect((await run("--detail", "full")).stdout).toBe(complete.stdout);
-        for (const depth of [undefined, 0, 1, 10]) {
+        for (const { depth, token } of [
+          { depth: undefined, token: undefined },
+          { depth: 0, token: "0" },
+          { depth: 1, token: "1" },
+          { depth: 2, token: "2" },
+          { depth: 2, token: "02" },
+          { depth: 10, token: "10" },
+          {
+            depth: Number.MAX_SAFE_INTEGER,
+            token: String(Number.MAX_SAFE_INTEGER),
+          },
+        ]) {
           const result = await run(
             "--detail",
             "summary",
-            ...(depth === undefined ? [] : ["--outline-depth", String(depth)]),
+            ...(token === undefined ? [] : ["--outline-depth", token]),
           );
           expect(result.exitCode).toBe(0);
           expect(result.json).toHaveProperty("manifest", expectedManifest);
@@ -155,12 +166,55 @@ describe("compiled historical-source summary input boundaries", () => {
     },
   );
 
+  for (const [label, options] of [
+    ["--outline-depth=", ["--detail", "summary", "--outline-depth="]],
+    [
+      "an empty outline-depth argument",
+      ["--detail", "summary", "--outline-depth", ""],
+    ],
+    ...[
+      " ",
+      "\t",
+      "1\n",
+      "0x1",
+      "0b1",
+      "1e0",
+      "+1",
+      "1.0",
+      "-0",
+      "-1",
+      "1.5",
+      "NaN",
+      "9007199254740992",
+    ].map((value) => [
+      JSON.stringify(value),
+      ["--detail", "summary", "--outline-depth", value],
+    ]),
+  ] as const) {
+    cliTest(`rejects ${label} as an outline depth`, async ({ cli }) => {
+      const root = await createTestTempDirectory(
+        "rea-reference-summary-input-",
+      );
+      const result = await cli.run({
+        arguments: ["import-reference-source", root, ...options, "--json"],
+        cwd: root,
+      });
+      expect(result.exitCode).toBe(1);
+      expect(result.json).toMatchObject({
+        code: "VALIDATION_ERROR",
+        fieldErrors: expect.arrayContaining([
+          expect.objectContaining({
+            path: expect.stringContaining("outlineDepth"),
+          }),
+        ]),
+      });
+      expect(result.stdout).not.toContain("HistoricalSourceGraph");
+      expect(result.stdout).not.toContain("HistoricalSourceSummary");
+    });
+  }
+
   for (const options of [
     ["--detail", "summry"],
-    ["--detail", "summary", "--outline-depth", "-1"],
-    ["--detail", "summary", "--outline-depth", "1.5"],
-    ["--detail", "summary", "--outline-depth", "NaN"],
-    ["--detail", "summary", "--outline-depth", "9007199254740992"],
     ["--outline-depth", "1"],
     ["--detail", "full", "--outline-depth", "1"],
   ]) {