fix(tui): show config error details on startup (#27803)

packages/opencode/test/cli/cmd/tui/aggregate-failures.test.ts

@@ -5,6 +5,7 @@
  */
 import { describe, expect, test } from "bun:test"
 import { aggregateFailures } from "@/cli/cmd/tui/context/aggregate-failures"
+import { ConfigError } from "@/config/error"
 
 describe("aggregateFailures", () => {
   test("returns null when every result is fulfilled", () => {
@@ -41,11 +42,50 @@ describe("aggregateFailures", () => {
     expect(err!.message).toContain("agents: boom")
   })
 
+  test("formats structured config errors hidden inside SDK error causes", () => {
+    const configError = new ConfigError.InvalidError({
+      path: "/tmp/opencode.json",
+      issues: [{ message: "Expected object", path: ["provider", "anthropic", "options"] }],
+    })
+    const err = aggregateFailures([
+      {
+        name: "config.get",
+        result: {
+          status: "rejected",
+          reason: new Error("ConfigInvalidError", {
+            cause: {
+              body: configError.toObject(),
+            },
+          }),
+        },
+      },
+    ])
+
+    expect(err!.message).toContain("config.get: Configuration is invalid at /tmp/opencode.json")
+    expect(err!.message).toContain("Expected object provider.anthropic.options")
+  })
+
+  test("deduplicates identical failure messages across startup requests", () => {
+    const reason = new Error("same config problem")
+    const err = aggregateFailures([
+      { name: "config.providers", result: { status: "rejected", reason } },
+      { name: "provider.list", result: { status: "rejected", reason } },
+      { name: "app.agents", result: { status: "rejected", reason } },
+      { name: "config.get", result: { status: "rejected", reason } },
+      { name: "project.sync", result: { status: "fulfilled", value: undefined } },
+    ])
+
+    expect(err!.message).toContain("4 of 5 requests failed: same config problem")
+    expect(err!.message).toContain(
+      "Affected startup requests: config.providers, provider.list, app.agents, config.get",
+    )
+    expect(err!.message.match(/same config problem/g)?.length).toBe(1)
+  })
+
   test("attaches structured failure list under .cause", () => {
     const reason = new Error("nope")
     const err = aggregateFailures([{ name: "providers", result: { status: "rejected", reason } }])
-    const cause = err!.cause as { failures: Array<{ name: string; reason: unknown }> }
-    expect(cause.failures).toEqual([{ name: "providers", reason }])
+    expect(err!.cause).toEqual({ failures: [{ name: "providers", reason }] })
   })
 
   test("falls back to String() for opaque reasons", () => {

packages/opencode/test/server/httpapi-error-middleware.test.ts

@@ -1,6 +1,7 @@
 import { NodeHttpServer, NodeServices } from "@effect/platform-node"
 import { NamedError } from "@opencode-ai/core/util/error"
 import { describe, expect } from "bun:test"
+import { ConfigError } from "../../src/config/error"
 import { Effect, Layer } from "effect"
 import { HttpClient, HttpClientRequest, HttpRouter } from "effect/unstable/http"
 import { errorLayer } from "../../src/server/routes/instance/httpapi/middleware/error"
@@ -50,6 +51,27 @@ describe("HttpApi error middleware", () => {
     }),
   )
 
+  it.live("preserves config defects as client-visible bad requests", () =>
+    Effect.gen(function* () {
+      const configError = new ConfigError.InvalidError({
+        path: "/tmp/opencode.json",
+        issues: [{ message: "Expected object", path: ["provider", "anthropic", "options"] }],
+      })
+
+      yield* HttpRouter.add("GET", "/config-error", Effect.die(configError)).pipe(
+        Layer.provide(errorLayer),
+        HttpRouter.serve,
+        Layer.build,
+      )
+
+      const response = yield* HttpClientRequest.get("/config-error").pipe(HttpClient.execute)
+      const body = yield* response.json
+
+      expect(response.status).toBe(400)
+      expect(JSON.stringify(body)).toBe(JSON.stringify(configError.toObject()))
+    }),
+  )
+
   it.live("does not map storage not-found defects to 404", () =>
     Effect.gen(function* () {
       yield* HttpRouter.add(