diff --git a/vscode/src/codeReader/fixtures/rustLibs.rs b/vscode/src/codeReader/fixtures/rustLibs.rs
new file mode 100644
index 0000000..297857f
--- /dev/null
+++ b/vscode/src/codeReader/fixtures/rustLibs.rs
@@ -0,0 +1,25 @@
+use serde::{Deserialize, Serialize};
+
+/// 桌面端列表里的一行代理。
+#[derive(Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct AgentRow {
+    #[serde(rename = "agent_id")]
+    pub id: Uuid,
+    pub name: String,
+    #[serde(skip)]
+    secret: String,
+}
+
+use thiserror::Error;
+
+/// 读写代理时出的错。
+#[derive(Error, Debug)]
+pub enum AgentError {
+    /// 这个 id 没有代理
+    #[error("agent {id} 不存在")]
+    NotFound { id: Uuid },
+    /// 调用上游失败
+    #[error("上游错误")]
+    Upstream(#[from] Other),
+}
diff --git a/vscode/src/codeReader/index.ts b/vscode/src/codeReader/index.ts
index 4e1bdfe..5f119a3 100644
--- a/vscode/src/codeReader/index.ts
+++ b/vscode/src/codeReader/index.ts
@@ -35,7 +35,9 @@ import { fastapiRule } from './rules/fastapi'
 import { pydanticRule } from './rules/pydantic'
 import { reactRule } from './rules/react'
 import { rustImplRule } from './rules/rustImpl'
+import { serdeRule } from './rules/serde'
 import { sqlalchemyRule } from './rules/sqlalchemy'
+import { thiserrorRule } from './rules/thiserror'
 import { bundledWasmDir, TreeSitterRuntime } from './runtime'
 import { bashZhTranslator } from './translators/bashZh'
 import { dockerfileZhTranslator } from './translators/dockerfileZh'
@@ -165,6 +167,8 @@ export function registerCodeReader(context: ExtensionContext): CodeReaderApi {
     api.registerLibraryRule(fastapiRule),
     api.registerLibraryRule(reactRule),
     api.registerLibraryRule(rustImplRule),
+    api.registerLibraryRule(serdeRule),
+    api.registerLibraryRule(thiserrorRule),
   )
   return api
 }
diff --git a/vscode/src/codeReader/languages/rust.ts b/vscode/src/codeReader/languages/rust.ts
index 8d84367..dc5dc52 100644
--- a/vscode/src/codeReader/languages/rust.ts
+++ b/vscode/src/codeReader/languages/rust.ts
@@ -134,6 +134,8 @@ export function deriveNames(node: Node): string[] {
     for (const name of named(tree)) {
       if (name.type === 'identifier')
         names.push(name.text)
+      else if (name.type === 'scoped_identifier')
+        names.push(name.childForFieldName('name')?.text ?? name.text)
     }
   }
   return names
diff --git a/vscode/src/codeReader/rules/rustLibs.test.ts b/vscode/src/codeReader/rules/rustLibs.test.ts
new file mode 100644
index 0000000..e8f0398
--- /dev/null
+++ b/vscode/src/codeReader/rules/rustLibs.test.ts
@@ -0,0 +1,65 @@
+import type { BlockView } from '../blockView'
+import { describe, expect, it } from 'vitest'
+import { toBlockViews } from '../blockView'
+import { createRustAdapter } from '../languages/rust'
+import { readFixture, viewLines, WASM_DIR, withBlocks } from '../testSupport'
+import { rustZhTranslator } from '../translators/rustZh'
+import { rustImplRule } from './rustImpl'
+import { serdeRule } from './serde'
+import { thiserrorRule } from './thiserror'
+
+const adapter = createRustAdapter(WASM_DIR)
+const rules = [rustImplRule, serdeRule, thiserrorRule]
+
+function views(source: string): Promise<BlockView[]> {
+  return withBlocks(adapter, 'rust', source, blocks =>
+    toBlockViews(blocks, { source, language: adapter, markers: [] }, rustZhTranslator, {
+      rules,
+      report: (message) => {
+        throw new Error(message)
+      },
+    }))
+}
+
+describe('serde 与 thiserror', () => {
+  it('可序列化的结构体、错误枚举', async () => {
+    expect(viewLines(await views(readFixture('rustLibs.rs')))).toEqual([
+      'import 1',
+      '  来源: serde',
+      '  导入项: 2 个',
+      '    Deserialize | —',
+      '    Serialize | —',
+      'serde.struct 3',
+      '  名称: AgentRow ⟦可序列化｜⟧',
+      '  说明: 桌面端列表里的一行代理。',
+      '  可见性: 公开',
+      '  选项: 字段名改驼峰',
+      '  字段: 3 个',
+      '    id | Uuid | 公开 | 改名 agent_id',
+      '    name | String | 公开 | —',
+      '    secret | String | 本模块 | 不输出',
+      'import 14',
+      '  来源: thiserror',
+      '  导入项: 1 个',
+      '    Error | —',
+      'thiserror.error 16',
+      '  名称: AgentError',
+      '  说明: 读写代理时出的错。',
+      '  变体: 2 个',
+      '    NotFound | 这个 id 没有代理 | agent {id} 不存在',
+      '    Upstream | 调用上游失败 | 上游错误 ⟦透传来源｜⟧',
+    ])
+  })
+
+  it('没导入 serde 时，带 derive 的结构体仍是结构体', async () => {
+    const source = '#[derive(Serialize)]\npub struct AgentRow {\n    name: String,\n}\n'
+    const [card] = await views(source)
+    expect(card?.kind).toBe('class')
+  })
+
+  it('skip_serializing 也是不输出', async () => {
+    const source = 'use serde::Serialize;\n#[derive(Serialize)]\nstruct Row {\n    #[serde(skip_serializing)]\n    token: String,\n}\n'
+    const lines = viewLines(await views(source))
+    expect(lines).toContain('    token | String | 本模块 | 不输出')
+  })
+})
diff --git a/vscode/src/codeReader/rules/serde.ts b/vscode/src/codeReader/rules/serde.ts
new file mode 100644
index 0000000..17460bf
--- /dev/null
+++ b/vscode/src/codeReader/rules/serde.ts
@@ -0,0 +1,145 @@
+import type { ClassBlock, Inline, KindBadge, LibraryRule, Node, PropertyRow, RuleCard, SegmentGroup, ThemeColor, TokenRole } from '../contract'
+import type { rustVisibility } from '../languages/rust'
+import { attributeName, deriveNames, docSentence, itemAttributes, leadingAttributes, oneLine, stringContent, structFields } from '../languages/rust'
+import { named } from '../languages/shared'
+import { visibilityWord } from '../rustRows'
+
+/** 和结构体同一个青，序列化只是名称后的标签，不另换边框色。 */
+const COLOR: ThemeColor = { dark: '#4ec9b0', light: '#267f99' }
+const BADGE: KindBadge = { label: '可序列化', color: COLOR, icon: 'braces' }
+const MARKS = new Set(['Serialize', 'Deserialize'])
+
+/**
+ * 带 Serialize / Deserialize 的结构体。字段多一列「序列化」。
+ * 文件里导入了 serde 才启用。
+ */
+export const serdeRule: LibraryRule = {
+  id: 'serde',
+  label: 'serde 序列化',
+  languageIds: ['rust'],
+  libraries: ['serde'],
+  claim: block => block.kind === 'class' && block.node.type === 'struct_item' && marked(block) ? card(block) : undefined,
+  attributeNames: () => ({ attributes: {}, values: { kind: { 'serde.struct': '可序列化' } } }),
+}
+
+function marked(block: ClassBlock): boolean {
+  return deriveNames(block.node).some(name => MARKS.has(name))
+}
+
+function card(block: ClassBlock): RuleCard {
+  const fields = structFields(block.node)
+  const camel = renameAll(block.node) === 'camelCase'
+  const doc = docSentence(block.facts.doc)
+  const rows: PropertyRow[] = [
+    {
+      label: '名称',
+      value: block.facts.name ? [...copied(block.facts.name, 'type'), plain(' '), tag('可序列化')] : [tag('可序列化')],
+      ...(block.facts.name && { defines: range(block.facts.name) }),
+    },
+    ...(doc ? [{ label: '说明', value: { markdown: doc } }] : []),
+    { label: '可见性', value: [{ text: visibilityWord(block), role: 'keyword' as const }] },
+    ...(camel ? [{ label: '选项', value: [keyword('字段名改驼峰')] }] : []),
+    ...(fields.length > 0
+      ? [{
+          label: '字段',
+          value: [hint(`${fields.length} 个`)],
+          columns: ['字段', '类型', '可见性', '序列化'],
+          items: fields.map(field => ({
+            cells: [
+              copied(field.name, 'variable'),
+              copied(field.type, 'type'),
+              [keyword(visibilityWordOf(field.visibility))],
+              [serdeCell(field.name)],
+            ],
+            defines: range(field.name),
+          })),
+        }]
+      : []),
+  ]
+  return {
+    kind: 'serde.struct',
+    badge: BADGE,
+    rows,
+    ...(block.facts.name && { defines: range(block.facts.name) }),
+    absorbs: [],
+  }
+}
+
+function visibilityWordOf(visibility: ReturnType<typeof rustVisibility>): string {
+  switch (visibility) {
+    case 'public': return '公开'
+    case 'super': return '父模块'
+    case 'crate': return '本 crate'
+    default: return '本模块'
+  }
+}
+
+function serdeCell(fieldName: Node): Inline {
+  const field = fieldName.parent
+  if (!field)
+    return hint('—')
+  let rename: string | undefined
+  let skip = false
+  for (const attr of leadingAttributes(field)) {
+    if (attributeName(attr) !== 'serde')
+      continue
+    for (const piece of named(tokenTree(attr))) {
+      if (piece.type === 'identifier' && (piece.text === 'skip' || piece.text === 'skip_serializing'))
+        skip = true
+      if (piece.type === 'identifier' && piece.text === 'rename')
+        rename = stringContent(firstString(tokenTree(attr))) ?? rename
+    }
+  }
+  if (skip)
+    return hint('不输出')
+  if (rename)
+    return { text: `改名 ${rename}`, role: 'string' }
+  return hint('—')
+}
+
+function renameAll(node: Node): string | undefined {
+  for (const attr of itemAttributes(node)) {
+    if (attributeName(attr) !== 'serde')
+      continue
+    const names = named(tokenTree(attr))
+    if (!names.some(piece => piece.type === 'identifier' && piece.text === 'rename_all'))
+      continue
+    const value = stringContent(firstString(tokenTree(attr)))
+    if (value)
+      return value
+  }
+  return undefined
+}
+
+function tokenTree(attributeItem: Node): Node | undefined {
+  const attribute = named(attributeItem).find(child => child.type === 'attribute')
+  return attribute?.children.find(child => child?.type === 'token_tree') ?? undefined
+}
+
+function firstString(tree: Node | undefined): Node | undefined {
+  return tree?.children.find(child => child?.type === 'string_literal') ?? undefined
+}
+
+function copied(node: Node, role: TokenRole): Inline[] {
+  return [{ text: oneLine(node.text), role, offset: node.startIndex }]
+}
+
+function tag(label: string): SegmentGroup {
+  return { style: 'tag', label, segments: [], color: COLOR }
+}
+
+function plain(text: string): Inline {
+  return { text, role: 'plain' }
+}
+
+function keyword(text: string): Inline {
+  return { text, role: 'keyword' }
+}
+
+function hint(text: string): Inline {
+  return { text, role: 'hint' }
+}
+
+function range(node: Node): { startIndex: number, endIndex: number } {
+  return { startIndex: node.startIndex, endIndex: node.endIndex }
+}
diff --git a/vscode/src/codeReader/rules/thiserror.ts b/vscode/src/codeReader/rules/thiserror.ts
new file mode 100644
index 0000000..7d41961
--- /dev/null
+++ b/vscode/src/codeReader/rules/thiserror.ts
@@ -0,0 +1,113 @@
+import type { EnumBlock, Inline, KindBadge, LibraryRule, Node, PropertyRow, RuleCard, SegmentGroup, ThemeColor } from '../contract'
+import { attributeName, commentPlain, deriveNames, docSentence, firstSentence, stringContent, variantPayload } from '../languages/rust'
+import { named } from '../languages/shared'
+
+/** 错误卡用异常那种红。 */
+const COLOR: ThemeColor = { dark: '#f14c4c', light: '#cd3131' }
+const BADGE: KindBadge = { label: '错误', color: COLOR, icon: 'triangle-alert' }
+
+/**
+ * derive Error 的枚举。变体表是：变体、何时、展示。
+ * 文件里导入了 thiserror 才启用。
+ */
+export const thiserrorRule: LibraryRule = {
+  id: 'thiserror',
+  label: 'thiserror 错误',
+  languageIds: ['rust'],
+  libraries: ['thiserror'],
+  claim: block => block.kind === 'enum' && deriveNames(block.node).includes('Error') ? card(block) : undefined,
+  attributeNames: () => ({ attributes: {}, values: { kind: { 'thiserror.error': '错误' } } }),
+}
+
+function card(block: EnumBlock): RuleCard {
+  const doc = docSentence(block.facts.doc)
+  const rows: PropertyRow[] = [
+    {
+      label: '名称',
+      value: [{ text: block.facts.name.text, role: 'type', offset: block.facts.name.startIndex }],
+      defines: range(block.facts.name),
+    },
+    ...(doc ? [{ label: '说明', value: { markdown: doc } }] : []),
+    {
+      label: '变体',
+      value: [hint(`${block.facts.members.length} 个`)],
+      columns: ['变体', '何时', '展示'],
+      items: block.facts.members.map((member) => {
+        const variant = member.name.parent?.type === 'enum_variant' ? member.name.parent : member.name
+        const display = errorText(variant)
+        const cells: Inline[][] = [
+          [{ text: member.name.text, role: 'type', offset: member.name.startIndex }],
+          [hint(whenText(variant) ?? '—')],
+          display
+            ? [plain(display), ...(passesSource(variant) ? [plain(' '), tag('透传来源')] : [])]
+            : [hint(variantPayload(member.value) ?? '—')],
+        ]
+        return { cells, defines: range(member.name) }
+      }),
+    },
+  ]
+  return {
+    kind: 'thiserror.error',
+    badge: BADGE,
+    rows,
+    defines: range(block.facts.name),
+    absorbs: [],
+  }
+}
+
+/** 变体上面的文档注释，属性可以隔在中间。第一句是「何时」。 */
+function whenText(variant: Node): string | undefined {
+  const docs: Node[] = []
+  let prev = variant.previousNamedSibling
+  while (prev?.type === 'attribute_item')
+    prev = prev.previousNamedSibling
+  while (prev && (prev.type === 'line_comment' || prev.type === 'block_comment')) {
+    docs.unshift(prev)
+    prev = prev.previousNamedSibling
+  }
+  if (docs.length === 0)
+    return undefined
+  const sentence = firstSentence(docs.map(commentPlain).join(' '))
+  return sentence || undefined
+}
+
+function errorText(variant: Node): string | undefined {
+  let prev = variant.previousNamedSibling
+  while (prev?.type === 'attribute_item') {
+    if (attributeName(prev) === 'error') {
+      const tree = tokenTree(prev)
+      const literal = tree?.children.find(child => child?.type === 'string_literal')
+      const text = stringContent(literal ?? undefined)
+      if (text)
+        return text
+    }
+    prev = prev.previousNamedSibling
+  }
+  return undefined
+}
+
+function passesSource(variant: Node): boolean {
+  const body = variant.childForFieldName('body')
+  return named(body).some(child => child.type === 'attribute_item' && (attributeName(child) === 'from' || attributeName(child) === 'source'))
+}
+
+function tokenTree(attributeItem: Node): Node | undefined {
+  const attribute = named(attributeItem).find(child => child.type === 'attribute')
+  return attribute?.children.find(child => child?.type === 'token_tree') ?? undefined
+}
+
+function tag(label: string): SegmentGroup {
+  return { style: 'tag', label, segments: [], color: COLOR }
+}
+
+function plain(text: string): Inline {
+  return { text, role: 'plain' }
+}
+
+function hint(text: string): Inline {
+  return { text, role: 'hint' }
+}
+
+function range(node: Node): { startIndex: number, endIndex: number } {
+  return { startIndex: node.startIndex, endIndex: node.endIndex }
+}