effect(core): track stderr truncation; polish AppProcess callers (#27353)

packages/opencode/src/format/index.ts

@@ -5,6 +5,7 @@ import { InstanceState } from "@/effect/instance-state"
 import path from "path"
 import { mergeDeep } from "remeda"
 import { Config } from "@/config/config"
+import { errorMessage } from "@/util/error"
 import * as Log from "@opencode-ai/core/util/log"
 import * as Formatter from "./formatter"
 
@@ -100,7 +101,7 @@ export const layer = Layer.effect(
                         command: cmd,
                         ...item.environment,
                         file: filepath,
-                        cause: error.message,
+                        cause: errorMessage(error.cause ?? error),
                       })
                       return undefined
                     }),

packages/opencode/src/git/index.ts

@@ -124,7 +124,7 @@ export const layer = Layer.effect(
           text: () => result.stdout.toString("utf8"),
           stdout: result.stdout,
           stderr: result.stderr,
-          truncated: result.truncated,
+          truncated: result.stdoutTruncated || result.stderrTruncated,
         } satisfies Result
       },
       Effect.catch((err) => Effect.succeed(fail(err))),

packages/opencode/src/installation/index.ts

@@ -1,6 +1,7 @@
 import { Effect, Layer, Schema, Context, Stream } from "effect"
 import { FetchHttpClient, HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
 import { withTransientReadRetry } from "@/util/effect-http-client"
+import { errorMessage } from "@/util/error"
 import { ChildProcess } from "effect/unstable/process"
 import { AppProcess } from "@opencode-ai/core/process"
 import path from "path"
@@ -124,7 +125,7 @@ export const layer: Layer.Layer<Service, never, HttpClient.HttpClient | AppProce
           stderr: result.stderr.toString("utf8"),
         }
       },
-      Effect.catch(() => Effect.succeed({ code: 1, stdout: "", stderr: "" })),
+      Effect.catch((err) => Effect.succeed({ code: 1, stdout: "", stderr: errorMessage(err) })),
     )
 
     const getBrewFormula = Effect.fnUntraced(function* () {