diff --git a/packages/core/src/effect-zod.ts b/packages/core/src/effect-zod.ts
index 1c88712d7d..42d89ec7d5 100644
--- a/packages/core/src/effect-zod.ts
+++ b/packages/core/src/effect-zod.ts
@@ -36,7 +36,7 @@ export function zod<S extends Schema.Top>(schema: S): z.ZodType<Schema.Schema.Ty
  * mapped `.omit()` / `.extend()` surface triggers brand-intersection
  * explosions for branded primitives (`string & Brand<"SessionID">` extends
  * `object` via the brand and gets walked into the prototype by `DeepPartial`,
- * `updateSchema`, etc.), and zod's inference through `z.ZodType<T | undefined>`
+ * mapped-schema helpers, and zod's inference through `z.ZodType<T | undefined>`
  * wrappers also can't reconstruct `T` cleanly. Consumers that care about the
  * post-`.omit()` shape should cast `c.req.valid(...)` to the expected type.
  */
diff --git a/packages/opencode/src/util/fn.ts b/packages/opencode/src/util/fn.ts
deleted file mode 100644
index c75fc1bb54..0000000000
--- a/packages/opencode/src/util/fn.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { z } from "zod"
-
-export function fn<T extends z.ZodType, Result>(schema: T, cb: (input: z.infer<T>) => Result) {
-  const result = (input: z.infer<T>) => {
-    let parsed
-    try {
-      parsed = schema.parse(input)
-    } catch (e) {
-      console.trace("schema validation failure stack trace:")
-      if (e instanceof z.ZodError) {
-        console.error("schema validation issues:", JSON.stringify(e.issues, null, 2))
-      }
-      throw e
-    }
-
-    return cb(parsed)
-  }
-  result.force = (input: z.infer<T>) => cb(input)
-  result.schema = schema
-  return result
-}
diff --git a/packages/opencode/src/util/update-schema.ts b/packages/opencode/src/util/update-schema.ts
deleted file mode 100644
index f2246ece33..0000000000
--- a/packages/opencode/src/util/update-schema.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import z from "zod"
-
-export function updateSchema<T extends z.ZodRawShape>(schema: z.ZodObject<T>) {
-  const next = {} as {
-    [K in keyof T]: z.ZodOptional<z.ZodNullable<T[K]>>
-  }
-
-  for (const [k, v] of Object.entries(schema.required().shape) as [keyof T & string, z.ZodTypeAny][]) {
-    next[k] = v.nullable() as unknown as (typeof next)[typeof k]
-  }
-
-  return z.object(next)
-}