diff --git a/.project-docs/30-worklog/tasks/20260902-registration-invalid-params-59f94692.md b/.project-docs/30-worklog/tasks/20260902-registration-invalid-params-59f94692.md
new file mode 100644
index 0000000..da487df
--- /dev/null
+++ b/.project-docs/30-worklog/tasks/20260902-registration-invalid-params-59f94692.md
@@ -0,0 +1,61 @@
+# Task: Fix account registration invalid request parameters
+
+## Identity
+
+- Task ID: 20260902-registration-invalid-params-59f94692
+- Mode: Feature
+- Branch: codex/20260902-registration-invalid-params-59f94692-registration-invalid-params-59f94692
+- Worktree: /Users/inmanx/Documents/lwltAPI-registration-invalid-params-59f94692
+- Base commit: 3ed3af1feb503358b98fb57d3e8d97ab59d98129
+- Owner: codex
+- Status: Ready for Integration
+
+## Scope
+
+- Diagnose the current account-creation failure reported as “请求参数不符合要求”。
+- Correlate the operator form contract, API payload, server-side validation, privacy-safe runtime diagnostics, and account authorization tests.
+- Add a narrowly scoped client-side validation and error-feedback fix plus regression coverage.
+- Do not create or change a real account, read secrets or request payloads, deploy, restart the service, or modify ERP behavior.
+
+## Intent And Constraints
+
+- Preserve the accepted fixed-scope `admin` / `team_lead` / `user` account and authorization model.
+- Keep the server-side 12–512-character password boundary unchanged; prevent invalid form input from reaching the API and retain a safe backend-validation fallback.
+- Use runtime diagnostics only for validation field names; do not persist account names, passwords, request bodies, or other user data.
+- Treat the concurrent compact-dashboard task as a file-level overlap warning only; keep this change limited to the account form and its tests for later reconciliation.
+
+## Outcome
+
+- Privacy-safe diagnostics from the running standard service showed the two recent HTTP validation failures both had only `validation_paths=["password"]`; no request content was inspected.
+- Confirmed the mismatch: the API requires a 12–512-character password, while the account form used `novalidate` and submitted without an equivalent client-side check, causing a short password to surface only as the generic Zod response.
+- Added deterministic account-create validation before any API request. Invalid username, password, or role values now show a Chinese field-specific message, mark and focus the relevant field, and do not send a request.
+- Preserved safe backend fallback handling by retaining `error_code` and validation paths from API errors and mapping a server-side password rejection to the same actionable message.
+- Added the password requirement beside the form field and added focused regression coverage for short-password rejection, valid request normalization, backend fallback messaging, and visible form guidance.
+- No live account, database, service process, deployment, ERP state, or external system was changed.
+
+## Verification
+
+- Focused account-form regression: 4/4 passed.
+- Focused account-authorization regression: 8/8 passed.
+- `node --check LianSyn-platform/app.js`: passed.
+- `git diff --check`: passed before the final documentation update.
+- `node --run check:repo`: 10/10 passed.
+- `node --run check`: passed.
+- `node --run test:control-plane`: 153/153 passed.
+- `node --run test:legacy`: 260/260 passed, including the new four tests.
+- `node --run build`: passed.
+- `check_project_docs.py`: passed.
+- `check_doc_drift.py --task-id 20260902-registration-invalid-params-59f94692`: passed.
+- Verification used the bundled Node runtime and a temporary ignored `node_modules` symlink to the existing dependency tree because Node was not on the isolated shell `PATH`.
+
+## Follow-ups
+
+- Integrate this isolated feature change with the concurrent dashboard layout work, then restart or redeploy the standard service only under separate explicit authorization before expecting the live `/accounts` page to change.
+
+## Promotion Candidates
+
+- None recorded.
+
+## Supporting Records
+
+- [Account registration password validation evidence](../../50-evidence/topics/20260902-registration-invalid-params-59f94692__account-registration-password-validation.md)
diff --git a/.project-docs/50-evidence/topics/20260902-registration-invalid-params-59f94692__account-registration-password-validation.md b/.project-docs/50-evidence/topics/20260902-registration-invalid-params-59f94692__account-registration-password-validation.md
new file mode 100644
index 0000000..8469536
--- /dev/null
+++ b/.project-docs/50-evidence/topics/20260902-registration-invalid-params-59f94692__account-registration-password-validation.md
@@ -0,0 +1,27 @@
+# Account Registration Password Validation Evidence
+
+## Source
+
+- Read-only inspection on 2026-09-02 of the standard service's privacy-safe structured diagnostics.
+- Active account form, API request builder, `accountCreateSchema`, authentication validation, and account authorization tests at base commit `3ed3af1feb503358b98fb57d3e8d97ab59d98129`.
+
+## Finding
+
+- The two recent `http.request.invalid` events both reported only the validation path `password`.
+- The server contract requires an initial password length of 12–512 characters.
+- The HTML field declared the same `minlength` and `maxlength`, but the account form used `novalidate` and the JavaScript request path did not perform its own validation before calling `/api/accounts`.
+- Therefore a short initial password reached server-side Zod validation and the UI displayed the generic response “请求参数不符合要求。” instead of the actual password requirement.
+
+## Privacy And Safety
+
+- Only diagnostic event type and validation field paths were extracted.
+- No password, account name, request body, environment file, database row, or other business/user content was read or stored.
+- No live account request or runtime mutation was performed.
+
+## Confidence
+
+- High. Runtime field-path evidence, the active form behavior, and the server schema all identify the same password-length mismatch.
+
+## Stale Trigger
+
+- Reassess if the password contract, account form submission flow, or generic API validation response changes.
diff --git a/LianSyn-platform/app-account-form.test.mjs b/LianSyn-platform/app-account-form.test.mjs
new file mode 100644
index 0000000..bebd4fc
--- /dev/null
+++ b/LianSyn-platform/app-account-form.test.mjs
@@ -0,0 +1,85 @@
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import test from 'node:test';
+import vm from 'node:vm';
+
+const [appSource, indexSource] = await Promise.all([
+  readFile(new URL('./app.js', import.meta.url), 'utf8'),
+  readFile(new URL('./index.html', import.meta.url), 'utf8')
+]);
+
+function loadNamedFunction(name) {
+  const start = appSource.indexOf(`function ${name}(`);
+  assert.notEqual(start, -1, `${name} must exist`);
+  const signatureEnd = appSource.indexOf(') {', start);
+  assert.notEqual(signatureEnd, -1, `${name} must have a complete signature`);
+  const bodyStart = signatureEnd + 2;
+  let depth = 0;
+  let end = -1;
+  for (let index = bodyStart; index < appSource.length; index += 1) {
+    if (appSource[index] === '{') depth += 1;
+    if (appSource[index] === '}') {
+      depth -= 1;
+      if (depth === 0) {
+        end = index + 1;
+        break;
+      }
+    }
+  }
+  assert.notEqual(end, -1, `${name} must have a complete body`);
+  const context = {};
+  vm.runInNewContext(`${appSource.slice(start, end)}; globalThis.loaded = ${name};`, context);
+  return context.loaded;
+}
+
+test('account creation rejects a short password before sending the request', () => {
+  const validate = loadNamedFunction('validateAccountCreationValues');
+  const result = validate({
+    username: 'operator',
+    password: '12345678901',
+    role: 'user',
+    mustChangePassword: true
+  });
+  assert.equal(result.ok, false);
+  assert.equal(result.field, 'accountPassword');
+  assert.equal(result.message, '初始密码必须为 12—512 个字符。');
+  const createStart = appSource.indexOf('async function createAccountFromForm()');
+  const createEnd = appSource.indexOf('\n}\n\nasync function updateManagedAccount', createStart);
+  assert.notEqual(createStart, -1);
+  assert.notEqual(createEnd, -1);
+  const createSource = appSource.slice(createStart, createEnd);
+  assert.ok(createSource.indexOf('if (!validation.ok)') < createSource.indexOf("apiRequest('/api/accounts'"));
+  assert.match(createSource, /if \(!validation\.ok\) \{[\s\S]+return;[\s\S]+apiRequest\('\/api\/accounts'/u);
+});
+
+test('account creation normalizes valid form values into the server contract', () => {
+  const validate = loadNamedFunction('validateAccountCreationValues');
+  const result = validate({
+    username: '  TeamLead  ',
+    password: 'correct-horse-battery-staple',
+    role: 'team_lead',
+    mustChangePassword: true
+  });
+  assert.equal(result.ok, true);
+  assert.equal(result.body.username, 'TeamLead');
+  assert.equal(result.body.password, 'correct-horse-battery-staple');
+  assert.equal(result.body.role, 'team_lead');
+  assert.equal(result.body.must_change_password, true);
+  assert.equal(Array.isArray(result.body.business_route_ids), true);
+  assert.equal(result.body.business_route_ids.length, 0);
+});
+
+test('account creation translates backend password validation into an actionable message', () => {
+  const messageFor = loadNamedFunction('accountCreationErrorMessage');
+  const message = messageFor({
+    errorCode: 'invalid_request',
+    details: ['password'],
+    message: '请求参数不符合要求。'
+  });
+  assert.equal(message, '初始密码必须为 12—512 个字符。');
+});
+
+test('account form states the password requirement beside the field', () => {
+  assert.match(indexSource, /初始密码（12—512 个字符）<input id="accountPassword"/u);
+  assert.match(indexSource, /id="accountPassword"[^>]+minlength="12"[^>]+maxlength="512"/u);
+});
diff --git a/LianSyn-platform/app.js b/LianSyn-platform/app.js
index 7e953af..30a278b 100644
--- a/LianSyn-platform/app.js
+++ b/LianSyn-platform/app.js
@@ -262,7 +262,11 @@ async function apiRequest(path, options = {}) {
     showLoginPanel('登录已过期，请重新登录。');
   }
   if (!response.ok) {
-    throw new Error(payload?.message || payload?.error || `请求失败：HTTP ${response.status}`);
+    const requestError = new Error(payload?.message || payload?.error || `请求失败：HTTP ${response.status}`);
+    requestError.status = response.status;
+    requestError.errorCode = payload?.error_code || '';
+    requestError.details = payload?.details;
+    throw requestError;
   }
   return payload || {};
 }
@@ -891,6 +895,63 @@ function accountRoleLabel(role) {
   return '普通用户';
 }
 
+function validateAccountCreationValues(values = {}) {
+  const username = String(values.username || '').trim();
+  const password = String(values.password || '');
+  const role = String(values.role || '');
+  if (!username || username.length > 160) {
+    return { ok: false, field: 'accountUsername', message: '账号必须为 1—160 个字符。' };
+  }
+  if (password.length < 12 || password.length > 512) {
+    return { ok: false, field: 'accountPassword', message: '初始密码必须为 12—512 个字符。' };
+  }
+  if (!['admin', 'team_lead', 'user'].includes(role)) {
+    return { ok: false, field: 'accountRole', message: '请选择有效的账号角色。' };
+  }
+  return {
+    ok: true,
+    body: {
+      username,
+      password,
+      role,
+      must_change_password: values.mustChangePassword === true,
+      business_route_ids: []
+    }
+  };
+}
+
+function accountCreationErrorMessage(error) {
+  const details = Array.isArray(error?.details) ? error.details.map((item) => String(item || '')) : [];
+  if (error?.errorCode === 'invalid_request') {
+    if (details.some((path) => path === 'password' || path.startsWith('password.'))) {
+      return '初始密码必须为 12—512 个字符。';
+    }
+    if (details.some((path) => path === 'username' || path.startsWith('username.'))) {
+      return '账号必须为 1—160 个字符。';
+    }
+    if (details.some((path) => path === 'role' || path.startsWith('role.'))) {
+      return '请选择有效的账号角色。';
+    }
+  }
+  return error?.message || String(error);
+}
+
+function showAccountCreationValidationError(validation) {
+  const message = $('#accountMessage');
+  if (message) message.textContent = validation.message;
+  const field = validation.field ? document.getElementById(validation.field) : null;
+  if (field) {
+    field.setAttribute('aria-invalid', 'true');
+    field.focus();
+  }
+}
+
+function clearAccountCreationValidationErrors() {
+  for (const fieldId of ['accountUsername', 'accountPassword', 'accountRole']) {
+    document.getElementById(fieldId)?.removeAttribute('aria-invalid');
+  }
+}
+
 function renderAccounts() {
   const container = $('#accountList');
   if (!container) return;
@@ -1048,19 +1109,24 @@ async function syncAccounts() {
 
 async function createAccountFromForm() {
   if (!isAdministrator() || accountSettingsBusy) return;
+  const validation = validateAccountCreationValues({
+    username: $('#accountUsername').value,
+    password: $('#accountPassword').value,
+    role: $('#accountRole').value,
+    mustChangePassword: $('#accountMustChangePassword').checked
+  });
+  if (!validation.ok) {
+    showAccountCreationValidationError(validation);
+    return;
+  }
+  clearAccountCreationValidationErrors();
   accountSettingsBusy = true;
   renderAccounts();
   const message = $('#accountMessage');
   try {
     const result = await apiRequest('/api/accounts', {
       method: 'POST',
-      body: {
-        username: String($('#accountUsername').value || '').trim(),
-        password: String($('#accountPassword').value || ''),
-        role: $('#accountRole').value,
-        must_change_password: $('#accountMustChangePassword').checked,
-        business_route_ids: []
-      }
+      body: validation.body
     });
     if (result.account) accountList = [...accountList.filter((item) => item.id !== result.account.id), result.account]
       .sort((left, right) => left.username.localeCompare(right.username, 'zh-CN'));
@@ -5424,7 +5490,7 @@ document.addEventListener('DOMContentLoaded', async () => {
     event.preventDefault();
     createAccountFromForm().catch((error) => {
       const message = $('#accountMessage');
-      if (message) message.textContent = error.message || String(error);
+      if (message) message.textContent = accountCreationErrorMessage(error);
     });
   });
   $('#accountList')?.addEventListener('change', (event) => {
diff --git a/LianSyn-platform/index.html b/LianSyn-platform/index.html
index 8ebbd34..864dad1 100644
--- a/LianSyn-platform/index.html
+++ b/LianSyn-platform/index.html
@@ -96,7 +96,7 @@
           </div>
           <form id="accountForm" class="channel-form" novalidate>
             <label>账号<input id="accountUsername" maxlength="160" autocomplete="off" required></label>
-            <label>初始密码<input id="accountPassword" type="password" minlength="12" maxlength="512" autocomplete="new-password" required></label>
+            <label>初始密码（12—512 个字符）<input id="accountPassword" type="password" minlength="12" maxlength="512" autocomplete="new-password" required></label>
             <label>角色<select id="accountRole"><option value="user">普通用户</option><option value="team_lead">组长</option><option value="admin">管理员</option></select></label>
             <label class="history-select-all"><input id="accountMustChangePassword" type="checkbox" checked>首次登录必须修改密码</label>
             <button type="submit">创建账号</button>