diff --git a/src/contracts/toolInputReferences.test.ts b/src/contracts/toolInputReferences.test.ts
index 24985ed210..657b77f3cd 100644
--- a/src/contracts/toolInputReferences.test.ts
+++ b/src/contracts/toolInputReferences.test.ts
@@ -10,9 +10,41 @@ import {
   presentInputJsonSchema,
 } from "./inputSchemaPresentation.js";
 import { toolContract } from "./toolContracts.js";
-import { toolInputSchemaWithMetadata } from "./toolSchemaMetadata.js";
+import {
+  toolInputSchemaWithMetadata,
+  transformAdvertisedInputJsonSchema,
+} from "./toolSchemaMetadata.js";
 import { JAVASCRIPT_APPLICATION_EVIDENCE_EXAMPLE } from "./javascript/javascriptRuntimeReconciliationExample.js";
 
+it.each(["draft-2020-12", "draft-07"] as const)(
+  "honors projection options independently of cached wire transformations in %s",
+  (target) => {
+    const range = z.strictObject({ offset: z.number(), length: z.number() });
+    const canonical = toolInputSchemaWithMetadata({
+      ...toolContract("open_binary"),
+      inputSchema: z.strictObject({ before: range, after: range }),
+    });
+    const transform = (schema: Record<string, unknown>) => ({
+      ...schema,
+      title: "Transformed range inputs",
+    });
+    const options = { target, libraryOptions: { reused: "inline" as const } };
+    for (const inlineFirst of [false, true]) {
+      const wrapped = transformAdvertisedInputJsonSchema(canonical, transform);
+      const project = wrapped["~standard"].jsonSchema.input;
+      if (inlineFirst) project(options);
+      const shared = project({ target });
+      expect(JSON.stringify(shared)).toContain('"$ref":');
+      const inline = project(options);
+      expect(inline).toEqual(
+        transform(canonical["~standard"].jsonSchema.input(options)),
+      );
+      expect(JSON.stringify(inline)).not.toContain('"$ref":');
+      expect(project({ target })).toBe(shared);
+    }
+  },
+);
+
 it.each(["draft-2020-12", "draft-07"] as const)(
   "preserves the complete inline Evidence contract before deferred authentication in %s",
   (target) => {
diff --git a/src/contracts/toolSchemaMetadata.ts b/src/contracts/toolSchemaMetadata.ts
index 093f4845ca..a0821612db 100644
--- a/src/contracts/toolSchemaMetadata.ts
+++ b/src/contracts/toolSchemaMetadata.ts
@@ -146,7 +146,10 @@ export const transformAdvertisedInputJsonSchema = <Schema>(
   const byTarget = new Map<string, Record<string, unknown>>();
   const transformedInput = (options: unknown): unknown => {
     const target = Reflect.get(options as object, "target");
-    if (typeof target === "string") {
+    const cacheable =
+      typeof target === "string" &&
+      Reflect.get(options as object, "libraryOptions") === undefined;
+    if (cacheable) {
       const cached = byTarget.get(target);
       if (cached !== undefined) return cached;
     }
@@ -154,7 +157,7 @@ export const transformAdvertisedInputJsonSchema = <Schema>(
     const transformed = isSchemaRecord(projected)
       ? transform(projected)
       : projected;
-    if (typeof target === "string" && isSchemaRecord(transformed))
+    if (cacheable && isSchemaRecord(transformed))
       byTarget.set(target, transformed);
     return transformed;
   };