fix: improve executor failure handling

app/src/adapters/opencode/transport.ts

@@ -1,5 +1,5 @@
 import type { createOpencodeClient } from "@opencode-ai/sdk/v2";
-import { Agent, type Dispatcher } from "undici";
+import { Agent, fetch as undiciFetch } from "undici";
 import { log } from "../../core/contracts.js";
 
 type OpenCodeClient = ReturnType<typeof createOpencodeClient>;
@@ -27,12 +27,23 @@ export async function withPromptTransport<T>(
         bodyTimeout: 0,
     });
     try {
-        return await operation((input, init) =>
-            fetch(input, {
-                ...init,
+        const customFetch: typeof fetch = async (input, init) => {
+            const request = new Request(input, init);
+            const body =
+                request.method === "GET" || request.method === "HEAD"
+                    ? undefined
+                    : new Uint8Array(await request.arrayBuffer());
+            const response = await undiciFetch(request.url, {
+                method: request.method,
+                headers: Object.fromEntries(request.headers),
+                ...(body ? { body } : {}),
+                signal: request.signal,
+                redirect: request.redirect,
                 dispatcher,
-            } as RequestInit & { dispatcher: Dispatcher }),
-        );
+            });
+            return response as unknown as Response;
+        };
+        return await operation(customFetch);
     } finally {
         await dispatcher.close();
     }

app/src/application/publication/service.ts

@@ -31,7 +31,7 @@ export async function publishJob(
             context.botLogin,
             job,
             `Agent ${job.mode} failed`,
-            `Request \`${job.id.slice(0, 12)}\` failed. Inspect the redacted executor and controller logs.`,
+            failureDetail(job.id, result.message),
         );
         return { terminal: "failed" };
     }
@@ -39,3 +39,12 @@ export async function publishJob(
         ? publishPlan(context, job)
         : publishImplementation(context, job);
 }
+
+export function failureDetail(jobId: string, message: string): string {
+    const failure = message
+        .replaceAll("\r\n", "\n")
+        .split("\n")
+        .map((line) => `    ${line}`)
+        .join("\n");
+    return `Request \`${jobId.slice(0, 12)}\` failed.\n\nFailure:\n\n${failure}`;
+}

app/src/tests/adapters/opencode.test.ts

@@ -1,6 +1,28 @@
 import assert from "node:assert/strict";
+import { createServer } from "node:http";
 import test from "node:test";
-import { withWorkBudget } from "../../adapters/opencode/transport.js";
+import {
+    withPromptTransport,
+    withWorkBudget,
+} from "../../adapters/opencode/transport.js";
+
+test("uses a fetch implementation compatible with the prompt dispatcher", async () => {
+    const server = createServer((_request, response) => response.end("ok"));
+    await new Promise<void>((resolve) =>
+        server.listen(0, "127.0.0.1", resolve),
+    );
+    try {
+        const address = server.address();
+        assert.ok(address && typeof address === "object");
+        const response = await withPromptTransport((customFetch) =>
+            customFetch(new Request(`http://127.0.0.1:${address.port}/prompt`)),
+        );
+        assert.equal(response.status, 200);
+        assert.equal(await response.text(), "ok");
+    } finally {
+        await new Promise<void>((resolve) => server.close(() => resolve()));
+    }
+});
 
 test("returns completed OpenCode work without finalization", async () => {
     let stopped = false;

app/src/tests/application/publication.test.ts

@@ -0,0 +1,13 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { failureDetail } from "../../application/publication/service.js";
+
+test("renders the full executor failure as literal issue comment text", () => {
+    assert.equal(
+        failureDetail(
+            "15f9edbf-ff6f-4b29-8231-5fc394071976",
+            "OpenCode prompt failed\n```embedded markdown```\nfinal detail",
+        ),
+        "Request `15f9edbf-ff6` failed.\n\nFailure:\n\n    OpenCode prompt failed\n    ```embedded markdown```\n    final detail",
+    );
+});

deploy/Dockerfile

@@ -42,7 +42,7 @@ CMD ["node", "/opt/ci-agents/dist/application/controller/main.js"]
 
 FROM runtime AS executor
 ARG TARGETARCH=amd64
-ARG OPENCODE_VERSION=1.18.2
+ARG OPENCODE_VERSION=1
 ARG GITEA_MCP_VERSION=1.3.0
 USER root
 RUN npm install --global --omit=dev "opencode-ai@${OPENCODE_VERSION}" \