fix(host): log the network error behind a failed model request

.lane/memory/apps/host/src/worker.ts/01M4YQXGS3RQSHX8N6GH99R7D4-the-directory-s-self-name-st.md

@@ -4,9 +4,9 @@ anchor: '@file'
 created: 2026-10-15T02:58:00Z
 norm: '1'
 sig: 1a43097a4e1ad24c
-body_hash: 5e79b1f5e63ad3c5
-raw_hash: 1f3f06a6f1a6594b
-vouched: 2026-10-22T20:30:45Z
+body_hash: b51789a971b9b372
+raw_hash: 34f5d37f971c48ee
+vouched: 2026-10-27T18:45:09Z
 lines: 1-194
 ---
 

.lane/memory/apps/host/src/worker.ts/01M5ZAW8YH3P3CH606HT4P0H3P-the-model-sdks-and-pi-ai-kee.md

@@ -0,0 +1,12 @@
+---
+id: 01M5ZAW8YH3P3CH606HT4P0H3P
+anchor: '@file'
+created: 2026-10-27T18:45:04Z
+norm: '1'
+sig: 1a43097a4e1ad24c
+body_hash: b51789a971b9b372
+raw_hash: 34f5d37f971c48ee
+lines: 1-215
+---
+
+the model SDKs and pi-ai keep only "Connection error.", so the worker's fetch must log the real error before it is wrapped

.lane/memory/packages/channel/src/log.ts/01M5FHS8DZHENAVBR7RPWT8Q1A-the-poisoned-session-error-h.md

@@ -4,8 +4,9 @@ anchor: function failure
 created: 2026-10-21T15:37:54Z
 norm: '1'
 sig: f1231fd34544d478
-body_hash: f0ddb33d9820c29c
-raw_hash: 691df1159bc16114
+body_hash: 9c6bfc2d5c2e411f
+raw_hash: 407e5184a4d911dc
+vouched: 2026-10-27T18:45:09Z
 lines: 15-20
 ---
 

apps/host/src/worker.ts

@@ -15,7 +15,7 @@ import { images } from "./images";
 import { models, seal } from "./keys";
 import { defaultModel } from "./manage";
 import { lines } from "./lines";
-import { log, open } from "./log";
+import { failure, log, open } from "./log";
 import type { WorkerInfo, WorkerRequest } from "./protocol";
 import { tabs } from "./tabs";
 
@@ -47,6 +47,19 @@ if (record.hosted || record.moving) {
 	process.exit(0);
 }
 log("info", "worker.start", { bun: Bun.version });
+
+// Model SDKs turn a failed request into "Connection error." and pi-ai keeps only that message, so
+// the network error that explains it is logged here before it is wrapped.
+const send = globalThis.fetch;
+globalThis.fetch = Object.assign(async (input: string | URL | Request, init?: RequestInit) => {
+	try {
+		return await send(input, init);
+	} catch (error) {
+		const url = new URL(input instanceof Request ? input.url : input);
+		log("warn", "fetch.failed", { url: url.origin + url.pathname, ...failure(error) });
+		throw error;
+	}
+}, send);
 rmSync(paths.socket, { force: true });
 catalog.busy(id, false);
 

packages/channel/src/log.ts

@@ -11,10 +11,11 @@ export function scoped(log: Log, base: Fields): Log {
 	return (level, event, fields) => log(level, event, { ...base, ...fields });
 }
 
-/** An error's message, stack, and cause, which JSON drops. */
+/** An error's message, code, stack, and cause, which JSON drops. */
 export function failure(error: unknown): Fields {
 	if (!(error instanceof Error)) return { error: String(error) };
 	const fields: Fields = { error: error.message, stack: error.stack };
+	if ("code" in error) fields.code = error.code;
 	if (error.cause !== undefined) fields.cause = failure(error.cause);
 	return fields;
 }