fix: add error handling to parseServiceCliOutput (#1737)

Co-authored-by: Test User <test@example.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
Co-authored-by: Steven Enamakel <enamakel@tinyhumans.ai>

app/src/utils/tauriCommands/common.test.ts

@@ -15,7 +15,7 @@
  */
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 
-import { isTauri } from './common';
+import { isTauri, parseServiceCliOutput } from './common';
 
 const coreIsTauriMock = vi.fn();
 
@@ -90,3 +90,64 @@ describe('isTauri (tauriCommands/common)', () => {
     expect(isTauri()).toBe(false);
   });
 });
+
+// `parseServiceCliOutput` runs against raw CLI stdout from the `openhuman`
+// sidecar. The core process can crash mid-write, return a partial response, or
+// drift from the expected JSON schema across versions — any of which produces
+// malformed input. The guard must reject those cases with a descriptive error
+// rather than handing typed garbage back to callers.
+describe('parseServiceCliOutput (tauriCommands/common)', () => {
+  it('returns the parsed response when shape matches CommandResponse', () => {
+    const raw = JSON.stringify({ result: { value: 42 }, logs: ['ok'] });
+
+    const parsed = parseServiceCliOutput<{ value: number }>(raw);
+
+    expect(parsed.result).toEqual({ value: 42 });
+    expect(parsed.logs).toEqual(['ok']);
+  });
+
+  it('accepts null result and empty logs (valid CommandResponse shape)', () => {
+    const raw = JSON.stringify({ result: null, logs: [] });
+
+    const parsed = parseServiceCliOutput<null>(raw);
+
+    expect(parsed.result).toBeNull();
+    expect(parsed.logs).toEqual([]);
+  });
+
+  it('throws a descriptive error when the input is not valid JSON', () => {
+    expect(() => parseServiceCliOutput('not-json')).toThrow(/Failed to parse service CLI output/);
+  });
+
+  it('throws when the parsed value is null', () => {
+    expect(() => parseServiceCliOutput('null')).toThrow(/CommandResponse shape/);
+  });
+
+  it('throws when the parsed value is an array (not an object)', () => {
+    expect(() => parseServiceCliOutput('[]')).toThrow(/CommandResponse shape/);
+  });
+
+  it('throws when required `logs` field is missing', () => {
+    expect(() => parseServiceCliOutput(JSON.stringify({ result: 1 }))).toThrow(
+      /CommandResponse shape/
+    );
+  });
+
+  it('throws when required `result` field is missing', () => {
+    expect(() => parseServiceCliOutput(JSON.stringify({ logs: [] }))).toThrow(
+      /CommandResponse shape/
+    );
+  });
+
+  it('throws when `logs` is not an array', () => {
+    expect(() => parseServiceCliOutput(JSON.stringify({ result: 1, logs: 'oops' }))).toThrow(
+      /CommandResponse shape/
+    );
+  });
+
+  it('throws when `logs` contains non-string entries', () => {
+    expect(() => parseServiceCliOutput(JSON.stringify({ result: 1, logs: [1, 2] }))).toThrow(
+      /CommandResponse shape/
+    );
+  });
+});

app/src/utils/tauriCommands/common.ts

@@ -64,7 +64,33 @@ export function tauriErrorMessage(err: unknown): string {
   return 'Unknown Tauri invoke error';
 }
 
+function isCommandResponse<T>(value: unknown): value is CommandResponse<T> {
+  if (!value || typeof value !== 'object' || Array.isArray(value)) {
+    return false;
+  }
+  const candidate = value as { result?: unknown; logs?: unknown };
+  if (!('result' in candidate) || !('logs' in candidate)) {
+    return false;
+  }
+  if (!Array.isArray(candidate.logs)) {
+    return false;
+  }
+  return candidate.logs.every(entry => typeof entry === 'string');
+}
+
 export function parseServiceCliOutput<T>(raw: string): CommandResponse<T> {
-  const parsed = JSON.parse(raw) as CommandResponse<T>;
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(raw);
+  } catch (err) {
+    throw new Error(
+      `Failed to parse service CLI output as JSON: ${err instanceof Error ? err.message : String(err)}`
+    );
+  }
+  if (!isCommandResponse<T>(parsed)) {
+    throw new Error(
+      'Failed to parse service CLI output as JSON: parsed value does not match CommandResponse shape'
+    );
+  }
   return parsed;
 }