diff --git a/backend/scripts/p2-acceptance.mjs b/backend/scripts/p2-acceptance.mjs
index ace44310..d62d6542 100644
--- a/backend/scripts/p2-acceptance.mjs
+++ b/backend/scripts/p2-acceptance.mjs
@@ -780,8 +780,6 @@ async function writeInstallationFiles(ctx) {
       "workspace-maintenance": {
         image: ctx.coreImageTag,
         environment: {
-          P2_CHILD_DEBUG: "1",
-          THT_P2_DEBUG: "1",
           THT_EVIDENCE_PRIVATE_HOST_ALLOWLIST: "host.docker.internal",
         },
         extra_hosts: ["host.docker.internal:host-gateway"],
diff --git a/backend/src/workspace-maintenance.ts b/backend/src/workspace-maintenance.ts
index 248a96f9..20b8e01d 100644
--- a/backend/src/workspace-maintenance.ts
+++ b/backend/src/workspace-maintenance.ts
@@ -149,17 +149,8 @@ export async function runWorkspaceMaintenanceCli(
     const result = failureResult(command, (() => {
       try { return JSON.parse(io.stdin).workspaceId ?? ""; } catch { return ""; }
     })(), failureCode);
-    if (process.env.P2_CHILD_DEBUG === "1") {
-      const detail = String((error as Error).message ?? "").replace(/[\r\n]+/g, " ").slice(0, 2048);
-      result.warnings = detail.length > 0 ? [detail] : undefined;
-    }
     io.writeStdout(boundedJson(result));
-    if (process.env.P2_CHILD_DEBUG === "1") {
-      const detail = String((error as Error).message ?? "").replace(/[\r\n]+/g, " ").slice(0, 2048);
-      io.writeStderr(`workspace maintenance failed: ${detail}\n`);
-    } else {
-      io.writeStderr(sanitizeStderr(error));
-    }
+    io.writeStderr(sanitizeStderr(error));
     const message = String((error as Error).message ?? "");
     const requestError = error instanceof SyntaxError
       || message === "invalid request"
@@ -275,14 +266,7 @@ function createProductionService(): WorkspacePreprocessingService {
           let stderr = "";
           child.stdout?.on("data", (chunk: Buffer) => { stdout += chunk.toString("utf8"); });
           child.stderr?.on("data", (chunk: Buffer) => { stderr += chunk.toString("utf8"); });
-          child.on("close", (code) => {
-            const capped = { exitCode: code ?? 0, stdout, stderr: stderr.slice(0, 64 * 1024) };
-            if (process.env.P2_CHILD_DEBUG === "1" && (code ?? 0) !== 0) {
-              capped.stdout = stdout.slice(0, 4096);
-              capped.stderr = stderr.slice(0, 4096);
-            }
-            resolve(capped);
-          });
+          child.on("close", (code) => resolve({ exitCode: code ?? 0, stdout, stderr: stderr.slice(0, 64 * 1024) }));
           child.on("error", (error) => resolve({ exitCode: 1, stdout, stderr: String(error.message).slice(0, 4096) }));
         });
       } finally {
diff --git a/backend/src/workspaces/preprocessing-service.ts b/backend/src/workspaces/preprocessing-service.ts
index 7142ad56..87015df1 100644
--- a/backend/src/workspaces/preprocessing-service.ts
+++ b/backend/src/workspaces/preprocessing-service.ts
@@ -430,13 +430,7 @@ export class WorkspacePreprocessingService {
 
   private async runJsonStage(runtime: ActiveRuntime, argv: string[]): Promise<Record<string, unknown>> {
     const result = await this.deps.runChild({ argv, configPath: runtime.configLease.path });
-    if (result.exitCode !== 0) {
-      if (process.env.P2_CHILD_DEBUG === "1") {
-        const detail = `${result.stderr ?? ""}${result.stdout ?? ""}`.replace(/[\r\n]+/g, " ").slice(0, 2048);
-        throw new Error(`workspace child failed: ${detail}`);
-      }
-      throw new Error("workspace child failed");
-    }
+    if (result.exitCode !== 0) throw new Error("workspace child failed");
     return JSON.parse(result.stdout) as Record<string, unknown>;
   }
 
diff --git a/harness/tht/cli/preprocess_cmd.py b/harness/tht/cli/preprocess_cmd.py
index a716fa50..646af9ee 100644
--- a/harness/tht/cli/preprocess_cmd.py
+++ b/harness/tht/cli/preprocess_cmd.py
@@ -262,8 +262,6 @@ def dwh_cmd(
         result = run_dwh_from_config(config, steps=selected, resume=resume)
     except Exception as exc:  # noqa: BLE001
         payload = {"status": "failed", "error": "DWH preprocessing failed"}
-        if os.environ.get("THT_P2_DEBUG") == "1":
-            payload["error"] = f"DWH preprocessing failed: {type(exc).__name__}: {exc}"
         if json_output:
             typer.echo(json.dumps(payload, sort_keys=True))
         else: