feat: migrate Provider.Model and Provider.Info to Effect Schema, add config providers HttpApi slice

- migrate Provider.Model from Zod to Schema.Class with Schema.mutableKey
  on fields that the provider service mutates (id, name, cost, options,
  headers, variants, api.id)
- migrate Provider.Info from Zod to Schema.Class with Schema.mutableKey
  on mutated fields (name, env, options, models)
- inner types (Mode, Interleaved, Capabilities, Cache, Cost, Limit, Api)
  stay as Schema.Struct to avoid adding named refs to the SDK
- derive .zod compat surfaces for existing Hono routes
- add config httpapi route with GET /config/providers using typed
  ConfigProvidersResponse schema
- wire into httpapi/server.ts and bridge /config/providers behind flag
- zero SDK diff confirmed

packages/opencode/src/provider/provider.ts

@@ -1,4 +1,5 @@
 import z from "zod"
+import { zod } from "@/util/effect-zod"
 import os from "os"
 import fuzzysort from "fuzzysort"
 import { Config } from "../config"
@@ -18,7 +19,7 @@ import { Flag } from "../flag/flag"
 import { iife } from "@/util/iife"
 import { Global } from "../global"
 import path from "path"
-import { Effect, Layer, Context } from "effect"
+import { Effect, Layer, Context, Schema } from "effect"
 import { EffectBridge } from "@/effect"
 import { InstanceState } from "@/effect"
 import { AppFileSystem } from "@opencode-ai/shared/filesystem"
@@ -815,91 +816,96 @@ function custom(dep: CustomDep): Record<string, CustomLoader> {
   }
 }
 
-export const Model = z
-  .object({
-    id: ModelID.zod,
-    providerID: ProviderID.zod,
-    api: z.object({
-      id: z.string(),
-      url: z.string(),
-      npm: z.string(),
-    }),
-    name: z.string(),
-    family: z.string().optional(),
-    capabilities: z.object({
-      temperature: z.boolean(),
-      reasoning: z.boolean(),
-      attachment: z.boolean(),
-      toolcall: z.boolean(),
-      input: z.object({
-        text: z.boolean(),
-        audio: z.boolean(),
-        image: z.boolean(),
-        video: z.boolean(),
-        pdf: z.boolean(),
-      }),
-      output: z.object({
-        text: z.boolean(),
-        audio: z.boolean(),
-        image: z.boolean(),
-        video: z.boolean(),
-        pdf: z.boolean(),
-      }),
-      interleaved: z.union([
-        z.boolean(),
-        z.object({
-          field: z.enum(["reasoning_content", "reasoning_details"]),
-        }),
-      ]),
-    }),
-    cost: z.object({
-      input: z.number(),
-      output: z.number(),
-      cache: z.object({
-        read: z.number(),
-        write: z.number(),
-      }),
-      experimentalOver200K: z
-        .object({
-          input: z.number(),
-          output: z.number(),
-          cache: z.object({
-            read: z.number(),
-            write: z.number(),
-          }),
-        })
-        .optional(),
-    }),
-    limit: z.object({
-      context: z.number(),
-      input: z.number().optional(),
-      output: z.number(),
-    }),
-    status: z.enum(["alpha", "beta", "deprecated", "active"]),
-    options: z.record(z.string(), z.any()),
-    headers: z.record(z.string(), z.string()),
-    release_date: z.string(),
-    variants: z.record(z.string(), z.record(z.string(), z.any())).optional(),
-  })
-  .meta({
-    ref: "Model",
-  })
-export type Model = z.infer<typeof Model>
+const ModeSchema = Schema.Struct({
+  text: Schema.Boolean,
+  audio: Schema.Boolean,
+  image: Schema.Boolean,
+  video: Schema.Boolean,
+  pdf: Schema.Boolean,
+})
 
-export const Info = z
-  .object({
-    id: ProviderID.zod,
-    name: z.string(),
-    source: z.enum(["env", "config", "custom", "api"]),
-    env: z.string().array(),
-    key: z.string().optional(),
-    options: z.record(z.string(), z.any()),
-    models: z.record(z.string(), Model),
-  })
-  .meta({
-    ref: "Provider",
-  })
-export type Info = z.infer<typeof Info>
+const InterleavedSchema = Schema.Union([
+  Schema.Boolean,
+  Schema.Struct({
+    field: Schema.Literals(["reasoning_content", "reasoning_details"]),
+  }),
+])
+
+const CapabilitiesSchema = Schema.Struct({
+  temperature: Schema.Boolean,
+  reasoning: Schema.Boolean,
+  attachment: Schema.Boolean,
+  toolcall: Schema.Boolean,
+  input: ModeSchema,
+  output: ModeSchema,
+  interleaved: InterleavedSchema,
+})
+
+const CacheSchema = Schema.Struct({
+  read: Schema.Number,
+  write: Schema.Number,
+})
+
+const CostSchema = Schema.Struct({
+  input: Schema.Number,
+  output: Schema.Number,
+  cache: CacheSchema,
+  experimentalOver200K: Schema.mutableKey(
+    Schema.optional(
+      Schema.Struct({
+        input: Schema.Number,
+        output: Schema.Number,
+        cache: CacheSchema,
+      }),
+    ),
+  ),
+})
+
+const LimitSchema = Schema.Struct({
+  context: Schema.Number,
+  input: Schema.optional(Schema.Number),
+  output: Schema.Number,
+})
+
+const ApiSchema = Schema.Struct({
+  id: Schema.mutableKey(Schema.String),
+  url: Schema.String,
+  npm: Schema.String,
+})
+
+export class Model extends Schema.Class<Model>("Model")({
+  id: Schema.mutableKey(ModelID),
+  providerID: ProviderID,
+  api: ApiSchema,
+  name: Schema.mutableKey(Schema.String),
+  family: Schema.optional(Schema.String),
+  capabilities: CapabilitiesSchema,
+  cost: Schema.mutableKey(CostSchema),
+  limit: LimitSchema,
+  status: Schema.Literals(["alpha", "beta", "deprecated", "active"]),
+  options: Schema.mutableKey(Schema.Record(Schema.String, Schema.mutableKey(Schema.Any))),
+  headers: Schema.mutableKey(Schema.Record(Schema.String, Schema.mutableKey(Schema.String))),
+  release_date: Schema.String,
+  variants: Schema.mutableKey(
+    Schema.optional(
+      Schema.Record(Schema.String, Schema.mutableKey(Schema.Record(Schema.String, Schema.mutableKey(Schema.Any)))),
+    ),
+  ),
+}) {
+  static readonly zod = zod(this)
+}
+
+export class Info extends Schema.Class<Info>("Provider")({
+  id: ProviderID,
+  name: Schema.mutableKey(Schema.String),
+  source: Schema.Literals(["env", "config", "custom", "api"]),
+  env: Schema.mutableKey(Schema.mutable(Schema.Array(Schema.String))),
+  key: Schema.optional(Schema.String),
+  options: Schema.mutableKey(Schema.Record(Schema.String, Schema.mutableKey(Schema.Any))),
+  models: Schema.mutableKey(Schema.Record(Schema.String, Schema.mutableKey(Model))),
+}) {
+  static readonly zod = zod(this)
+}
 
 export interface Interface {
   readonly list: () => Effect.Effect<Record<ProviderID, Info>>

packages/opencode/src/server/instance/config.ts

@@ -72,7 +72,7 @@ export const ConfigRoutes = lazy(() =>
               "application/json": {
                 schema: resolver(
                   z.object({
-                    providers: Provider.Info.array(),
+                    providers: z.array(Provider.Info.zod),
                     default: z.record(z.string(), z.string()),
                   }),
                 ),

packages/opencode/src/server/instance/httpapi/config.ts

@@ -0,0 +1,56 @@
+import { Provider } from "@/provider"
+import { Effect, Layer, Schema } from "effect"
+import { HttpApi, HttpApiBuilder, HttpApiEndpoint, HttpApiGroup, OpenApi } from "effect/unstable/httpapi"
+import { mapValues } from "remeda"
+
+const ConfigProvidersResponse = Schema.Struct({
+  providers: Schema.Array(Provider.Info),
+  default: Schema.Record(Schema.String, Schema.String),
+})
+
+const root = "/config"
+
+export const ConfigApi = HttpApi.make("config")
+  .add(
+    HttpApiGroup.make("config")
+      .add(
+        HttpApiEndpoint.get("providers", `${root}/providers`, {
+          success: ConfigProvidersResponse,
+        }).annotateMerge(
+          OpenApi.annotations({
+            identifier: "config.providers",
+            summary: "List config providers",
+            description: "Get a list of all configured AI providers and their default models.",
+          }),
+        ),
+      )
+      .annotateMerge(
+        OpenApi.annotations({
+          title: "config",
+          description: "Config routes.",
+        }),
+      ),
+  )
+  .annotateMerge(
+    OpenApi.annotations({
+      title: "opencode HttpApi",
+      version: "0.0.1",
+      description: "Effect HttpApi surface for instance routes.",
+    }),
+  )
+
+export const configHandlers = Layer.unwrap(
+  Effect.gen(function* () {
+    const svc = yield* Provider.Service
+
+    const providers = Effect.fn("ConfigHttpApi.providers")(function* () {
+      const all = mapValues(yield* svc.list().pipe(Effect.orDie), (item) => item)
+      return {
+        providers: Object.values(all),
+        default: mapValues(all, (item) => Provider.sort(Object.values(item.models))[0].id),
+      }
+    })
+
+    return HttpApiBuilder.group(ConfigApi, "config", (handlers) => handlers.handle("providers", providers))
+  }),
+).pipe(Layer.provide(Provider.defaultLayer))

packages/opencode/src/server/instance/httpapi/server.ts

@@ -10,6 +10,7 @@ import { InstanceBootstrap } from "@/project/bootstrap"
 import { Instance } from "@/project/instance"
 import { lazy } from "@/util/lazy"
 import { Filesystem } from "@/util"
+import { ConfigApi, configHandlers } from "./config"
 import { PermissionApi, permissionHandlers } from "./permission"
 import { ProviderApi, providerHandlers } from "./provider"
 import { QuestionApi, questionHandlers } from "./question"
@@ -109,11 +110,13 @@ export namespace ExperimentalHttpApiServer {
   const QuestionSecured = QuestionApi.middleware(Authorization)
   const PermissionSecured = PermissionApi.middleware(Authorization)
   const ProviderSecured = ProviderApi.middleware(Authorization)
+  const ConfigSecured = ConfigApi.middleware(Authorization)
 
   export const routes = Layer.mergeAll(
     HttpApiBuilder.layer(QuestionSecured).pipe(Layer.provide(questionHandlers)),
     HttpApiBuilder.layer(PermissionSecured).pipe(Layer.provide(permissionHandlers)),
     HttpApiBuilder.layer(ProviderSecured).pipe(Layer.provide(providerHandlers)),
+    HttpApiBuilder.layer(ConfigSecured).pipe(Layer.provide(configHandlers)),
   ).pipe(
     Layer.provide(auth),
     Layer.provide(normalize),

packages/opencode/src/server/instance/index.ts

@@ -47,6 +47,7 @@ export const InstanceRoutes = (upgrade: UpgradeWebSocket): Hono => {
       .all("/permission", (c) => handler(c.req.raw))
       .all("/permission/*", (c) => handler(c.req.raw))
       .all("/provider/auth", (c) => handler(c.req.raw))
+      .all("/config/providers", (c) => handler(c.req.raw))
   }
 
   return app

packages/opencode/src/server/instance/provider.ts

@@ -27,7 +27,7 @@ export const ProviderRoutes = lazy(() =>
               "application/json": {
                 schema: resolver(
                   z.object({
-                    all: Provider.Info.array(),
+                    all: z.array(Provider.Info.zod),
                     default: z.record(z.string(), z.string()),
                     connected: z.array(z.string()),
                   }),