From 2da6d860e0e2c5309a0030a5591c8218fffd6a99 Mon Sep 17 00:00:00 2001
From: Kit Langton <kit.langton@gmail.com>
Date: Tue, 21 Apr 2026 17:49:24 -0400
Subject: [PATCH] refactor(core): derive provider schema .zod via effect-zod
 walker (#23753)

---
 packages/opencode/specs/effect/schema.md | 2 +-
 packages/opencode/src/provider/schema.ts | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/opencode/specs/effect/schema.md b/packages/opencode/specs/effect/schema.md
index df3cc0881d..3ed0b825d5 100644
--- a/packages/opencode/specs/effect/schema.md
+++ b/packages/opencode/specs/effect/schema.md
@@ -162,7 +162,7 @@ schema module with a clear domain.
 - [ ] `src/control-plane/schema.ts`
 - [ ] `src/permission/schema.ts`
 - [ ] `src/project/schema.ts`
-- [ ] `src/provider/schema.ts`
+- [x] `src/provider/schema.ts`
 - [ ] `src/pty/schema.ts`
 - [ ] `src/question/schema.ts`
 - [ ] `src/session/schema.ts`
diff --git a/packages/opencode/src/provider/schema.ts b/packages/opencode/src/provider/schema.ts
index 702616018a..ea3cac3424 100644
--- a/packages/opencode/src/provider/schema.ts
+++ b/packages/opencode/src/provider/schema.ts
@@ -1,6 +1,6 @@
 import { Schema } from "effect"
-import z from "zod"
 
+import { zod } from "@/util/effect-zod"
 import { withStatics } from "@/util/schema"
 
 const providerIdSchema = Schema.String.pipe(Schema.brand("ProviderID"))
@@ -9,7 +9,7 @@ export type ProviderID = typeof providerIdSchema.Type
 
 export const ProviderID = providerIdSchema.pipe(
   withStatics((schema: typeof providerIdSchema) => ({
-    zod: z.string().pipe(z.custom<ProviderID>()),
+    zod: zod(schema),
     // Well-known providers
     opencode: schema.make("opencode"),
     anthropic: schema.make("anthropic"),
@@ -30,7 +30,7 @@ const modelIdSchema = Schema.String.pipe(Schema.brand("ModelID"))
 export type ModelID = typeof modelIdSchema.Type
 
 export const ModelID = modelIdSchema.pipe(
-  withStatics((_schema: typeof modelIdSchema) => ({
-    zod: z.string().pipe(z.custom<ModelID>()),
+  withStatics((schema: typeof modelIdSchema) => ({
+    zod: zod(schema),
   })),
 )