diff --git a/package.json b/package.json
index b297305..3a38ff0 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,9 @@
     "lint": "next lint",
     "test": "vitest",
     "test:e2e": "playwright test",
-    "taxonomy:backfill": "ts-node --compiler-options '{\"module\":\"CommonJS\",\"moduleResolution\":\"node\"}' scripts/backfill-tag-taxonomy.ts"
+    "taxonomy:backfill": "ts-node --compiler-options '{\"module\":\"CommonJS\",\"moduleResolution\":\"node\"}' scripts/backfill-tag-taxonomy.ts",
+    "domains:sync": "ts-node --compiler-options '{\"module\":\"CommonJS\",\"moduleResolution\":\"node\"}' scripts/sync-domain-scenarios.ts",
+    "tags:dedupe-free": "ts-node --compiler-options '{\"module\":\"CommonJS\",\"moduleResolution\":\"node\"}' scripts/dedupe-free-tags-to-canonical.ts"
   },
   "dependencies": {
     "@prisma/client": "^6.1.0",
diff --git a/scripts/dedupe-free-tags-to-canonical.ts b/scripts/dedupe-free-tags-to-canonical.ts
new file mode 100644
index 0000000..1ab29b4
--- /dev/null
+++ b/scripts/dedupe-free-tags-to-canonical.ts
@@ -0,0 +1,184 @@
+import { PrismaClient, type TagCategory } from '@prisma/client'
+
+const prisma = new PrismaClient()
+
+type DedupeRule = {
+  sourceSlug: string
+  targetSlug: string
+  reason: string
+}
+
+const DEDUPE_RULES: DedupeRule[] = [
+  {
+    sourceSlug: 'ai-development-tool',
+    targetSlug: 'code-dev',
+    reason: 'AI 开发工具与开发者工具/代码领域语义重复',
+  },
+  {
+    sourceSlug: 'code-generation',
+    targetSlug: 'code-dev',
+    reason: '代码生成与开发者工具/代码领域语义重复',
+  },
+  {
+    sourceSlug: 'library',
+    targetSlug: 'code-dev',
+    reason: 'Library 与开发者工具/代码领域语义重复',
+  },
+  {
+    sourceSlug: '知识管理',
+    targetSlug: 'knowledge-rag',
+    reason: '知识管理与知识管理/检索/RAG 领域语义重复',
+  },
+  {
+    sourceSlug: 'knowledge-graph',
+    targetSlug: 'knowledge-rag',
+    reason: '知识图谱归并到知识管理/检索/RAG 领域',
+  },
+  {
+    sourceSlug: '向量数据库',
+    targetSlug: 'knowledge-rag',
+    reason: '向量数据库在本项目中归并到知识管理/检索/RAG 领域',
+  },
+  {
+    sourceSlug: 'ai-security',
+    targetSlug: 'security-privacy',
+    reason: 'AI 安全与安全/隐私领域语义重复',
+  },
+  {
+    sourceSlug: '隐私保护',
+    targetSlug: 'security-privacy',
+    reason: '隐私保护与安全/隐私领域语义重复',
+  },
+  {
+    sourceSlug: 'data-analytics',
+    targetSlug: 'data-bi',
+    reason: '数据分析与数据分析/BI/可视化领域语义重复',
+  },
+  {
+    sourceSlug: 'visualization',
+    targetSlug: 'data-bi',
+    reason: '可视化与数据分析/BI/可视化领域语义重复',
+  },
+  {
+    sourceSlug: 'computer-vision',
+    targetSlug: 'vision-multimodal',
+    reason: '计算机视觉与计算机视觉/多模态领域语义重复',
+  },
+  {
+    sourceSlug: 'enterprise-ai',
+    targetSlug: 'enterprise-office',
+    reason: '企业级 AI 应用与企业应用/办公领域语义重复',
+  },
+  {
+    sourceSlug: 'chatbot',
+    targetSlug: 'enterprise-office',
+    reason: '聊天机器人与企业应用/办公领域语义重复',
+  },
+]
+
+const CANONICAL_CATEGORIES: TagCategory[] = ['DOMAIN_SCENARIO', 'FIXED_PROJECT_TYPE']
+
+async function dedupeRule(rule: DedupeRule) {
+  return prisma.$transaction(async (tx) => {
+    const source = await tx.tag.findUnique({
+      where: { slug: rule.sourceSlug },
+      include: { _count: { select: { projects: true } } },
+    })
+    if (!source) {
+      return {
+        status: 'skipped' as const,
+        sourceSlug: rule.sourceSlug,
+        targetSlug: rule.targetSlug,
+        message: 'source_not_found',
+      }
+    }
+
+    if (source.category !== 'FREE_TAG') {
+      return {
+        status: 'skipped' as const,
+        sourceSlug: rule.sourceSlug,
+        targetSlug: rule.targetSlug,
+        message: `source_not_free_tag:${source.category}`,
+      }
+    }
+
+    const target = await tx.tag.findUnique({
+      where: { slug: rule.targetSlug },
+      include: { _count: { select: { projects: true } } },
+    })
+    if (!target) {
+      return {
+        status: 'skipped' as const,
+        sourceSlug: rule.sourceSlug,
+        targetSlug: rule.targetSlug,
+        message: 'target_not_found',
+      }
+    }
+
+    if (!CANONICAL_CATEGORIES.includes(target.category)) {
+      return {
+        status: 'skipped' as const,
+        sourceSlug: rule.sourceSlug,
+        targetSlug: rule.targetSlug,
+        message: `target_not_canonical:${target.category}`,
+      }
+    }
+
+    const sourceLinks = await tx.projectTag.findMany({
+      where: { tagId: source.id },
+      select: { projectId: true },
+    })
+
+    if (sourceLinks.length > 0) {
+      await tx.projectTag.createMany({
+        data: sourceLinks.map((link) => ({
+          projectId: link.projectId,
+          tagId: target.id,
+        })),
+        skipDuplicates: true,
+      })
+    }
+
+    await tx.tag.delete({
+      where: { id: source.id },
+    })
+
+    return {
+      status: 'deduped' as const,
+      sourceSlug: rule.sourceSlug,
+      targetSlug: rule.targetSlug,
+      movedProjectLinks: sourceLinks.length,
+      sourceProjectCount: source._count.projects,
+      reason: rule.reason,
+    }
+  })
+}
+
+async function main() {
+  console.log('[dedupe-free-tags] start')
+  const results: Array<Record<string, unknown>> = []
+
+  for (const rule of DEDUPE_RULES) {
+    const result = await dedupeRule(rule)
+    results.push(result)
+  }
+
+  const dedupedCount = results.filter((item) => item.status === 'deduped').length
+  const skippedCount = results.filter((item) => item.status === 'skipped').length
+
+  console.log('[dedupe-free-tags] done', {
+    totalRules: DEDUPE_RULES.length,
+    dedupedCount,
+    skippedCount,
+  })
+  console.log('[dedupe-free-tags] results', results)
+}
+
+main()
+  .catch((error) => {
+    console.error('[dedupe-free-tags] failed', error)
+    process.exit(1)
+  })
+  .finally(async () => {
+    await prisma.$disconnect()
+  })
diff --git a/scripts/sync-domain-scenarios.ts b/scripts/sync-domain-scenarios.ts
new file mode 100644
index 0000000..cb135a6
--- /dev/null
+++ b/scripts/sync-domain-scenarios.ts
@@ -0,0 +1,320 @@
+import { PrismaClient } from '@prisma/client'
+import {
+  DOMAIN_SCENARIO_PRESET_TAGS,
+  type DomainScenarioPresetSlug,
+} from '../src/lib/tag-taxonomy'
+
+const prisma = new PrismaClient()
+
+type DomainRule = {
+  slug: DomainScenarioPresetSlug
+  aliasSlugs: string[]
+  keywords: string[]
+  minScore: number
+  minKeywordHits: number
+}
+
+const DOMAIN_RULES: DomainRule[] = [
+  {
+    slug: 'code-dev',
+    aliasSlugs: [
+      'code-dev',
+      'ai-development-tool',
+      'code-generation',
+      'tool-calling',
+      'vs-code-extension',
+      'cli',
+      'library',
+      'agent-framework',
+      'ai-agent-framework',
+    ],
+    keywords: ['code', 'coding', 'programming', 'developer', '编程', '代码', '开发工具'],
+    minScore: 2,
+    minKeywordHits: 2,
+  },
+  {
+    slug: 'automation-workflow',
+    aliasSlugs: [
+      'automation-workflow',
+      'automation',
+      'workflow-automation',
+      'workflow-orchestration',
+      'web-automation',
+      'browser-automation',
+      'rpa',
+    ],
+    keywords: ['workflow', 'automation', 'orchestration', 'rpa', '自动化', '工作流', '编排'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'knowledge-rag',
+    aliasSlugs: [
+      'knowledge-rag',
+      'knowledge-management',
+      '知识管理',
+      'knowledge-base',
+      'knowledge-graph',
+      'rag',
+      '向量数据库',
+      'vector-database',
+      'llamaindex',
+    ],
+    keywords: ['knowledge', 'retrieval', 'memory', 'rag', '知识', '检索', '记忆', '知识库'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'education-research',
+    aliasSlugs: [
+      'education-research',
+      'docs-tutorial',
+      'ai-research',
+      'markdown',
+      'tutorial',
+      'guide',
+      'paper',
+      'benchmark',
+    ],
+    keywords: ['tutorial', 'guide', 'docs', 'paper', 'course', '教程', '指南', '文档', '论文', '课程'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'model-inference',
+    aliasSlugs: [
+      'model-inference',
+      'inference-model',
+      'llm',
+      '大语言模型',
+      'transformers',
+      'pytorch',
+      'machine-learning',
+      'deep-learning',
+      'reinforcement-learning',
+      'vllm',
+    ],
+    keywords: ['model', 'inference', 'training', 'finetune', '模型', '推理', '训练', '微调'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'api-integration',
+    aliasSlugs: [
+      'api-integration',
+      'model-context-protocol',
+      'sdk',
+      'api-gateway',
+    ],
+    keywords: ['api', 'sdk', 'protocol', 'integration', 'mcp', '接口', '协议', '集成'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'vision-multimodal',
+    aliasSlugs: ['vision-multimodal', 'computer-vision', 'multimodal', 'multimodal-ai'],
+    keywords: ['vision', 'image', 'video', 'multimodal', '视觉', '图像', '视频', '多模态'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'data-bi',
+    aliasSlugs: ['data-bi', 'data-analytics', '数据分析', 'visualization'],
+    keywords: ['analytics', 'dashboard', 'visualization', 'business intelligence', '数据分析', '可视化'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'security-privacy',
+    aliasSlugs: ['security-privacy', 'ai-security', '隐私保护'],
+    keywords: ['security', 'privacy', 'safety', '安全', '隐私'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'enterprise-office',
+    aliasSlugs: ['enterprise-office', 'enterprise-ai', 'chatbot'],
+    keywords: ['enterprise', 'office', 'collaboration', 'crm', 'erp', '企业', '办公', '协作'],
+    minScore: 2,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'finance',
+    aliasSlugs: ['finance', 'fintech'],
+    keywords: ['finance', 'financial', 'trading', 'fintech', 'quant', '金融', '交易', '量化', '风控'],
+    minScore: 1,
+    minKeywordHits: 1,
+  },
+  {
+    slug: 'medical-biomed',
+    aliasSlugs: ['medical-biomed', 'medical', 'healthcare', 'biomedical'],
+    keywords: ['medical', 'healthcare', 'medicine', 'biomed', '医疗', '医学', '医药', '生物医学'],
+    minScore: 1,
+    minKeywordHits: 1,
+  },
+]
+
+const FALLBACK_BY_FIXED_PROJECT_TYPE: Partial<Record<string, DomainScenarioPresetSlug>> = {
+  'agent-tooling': 'code-dev',
+  'inference-model': 'model-inference',
+  'docs-tutorial': 'education-research',
+}
+
+function normalize(value: string): string {
+  return value.toLowerCase().trim()
+}
+
+function inferDomainSlugs(input: {
+  name: string
+  nameEn?: string | null
+  description: string
+  descriptionEn?: string | null
+  tagSlugs: string[]
+}): DomainScenarioPresetSlug[] {
+  const normalizedTagSet = new Set(input.tagSlugs.map((slug) => normalize(slug)))
+  const text = normalize(
+    [input.name, input.nameEn || '', input.description, input.descriptionEn || '', ...input.tagSlugs].join(' ')
+  )
+
+  const scoredDomains: Array<{ slug: DomainScenarioPresetSlug; score: number }> = []
+
+  for (const rule of DOMAIN_RULES) {
+    const tagHits = rule.aliasSlugs.reduce(
+      (acc, slug) => acc + (normalizedTagSet.has(normalize(slug)) ? 1 : 0),
+      0
+    )
+    const keywordHits = rule.keywords.reduce(
+      (acc, keyword) => acc + (text.includes(normalize(keyword)) ? 1 : 0),
+      0
+    )
+    const score = tagHits * 3 + keywordHits
+    if (score >= rule.minScore && (tagHits > 0 || keywordHits >= rule.minKeywordHits)) {
+      scoredDomains.push({ slug: rule.slug, score })
+    }
+  }
+
+  if (scoredDomains.length > 0) {
+    return scoredDomains
+      .sort((a, b) => b.score - a.score)
+      .slice(0, 3)
+      .map((item) => item.slug)
+  }
+
+  const fixedProjectType = input.tagSlugs.find((slug) => FALLBACK_BY_FIXED_PROJECT_TYPE[slug])
+  if (fixedProjectType) {
+    return [FALLBACK_BY_FIXED_PROJECT_TYPE[fixedProjectType]!]
+  }
+
+  return ['code-dev']
+}
+
+async function main() {
+  console.log('[domain] start sync')
+
+  const canonicalTagIdMap = new Map<DomainScenarioPresetSlug, string>()
+  for (const domainTag of DOMAIN_SCENARIO_PRESET_TAGS) {
+    const tag = await prisma.tag.upsert({
+      where: { slug: domainTag.slug },
+      update: {
+        name: domainTag.name,
+        nameEn: domainTag.nameEn,
+        category: 'DOMAIN_SCENARIO',
+      },
+      create: {
+        name: domainTag.name,
+        nameEn: domainTag.nameEn,
+        slug: domainTag.slug,
+        category: 'DOMAIN_SCENARIO',
+      },
+    })
+
+    canonicalTagIdMap.set(domainTag.slug, tag.id)
+  }
+
+  const clearedLinks = await prisma.projectTag.deleteMany({
+    where: {
+      tagId: {
+        in: Array.from(canonicalTagIdMap.values()),
+      },
+    },
+  })
+
+  const projects = await prisma.project.findMany({
+    where: { status: 'ACTIVE' },
+    select: {
+      id: true,
+      name: true,
+      nameEn: true,
+      description: true,
+      descriptionEn: true,
+      tags: {
+        select: {
+          tag: {
+            select: {
+              slug: true,
+            },
+          },
+        },
+      },
+    },
+  })
+
+  const createData: Array<{ projectId: string; tagId: string }> = []
+  const distribution = new Map<DomainScenarioPresetSlug, number>()
+
+  for (const domainTag of DOMAIN_SCENARIO_PRESET_TAGS) {
+    distribution.set(domainTag.slug, 0)
+  }
+
+  for (const project of projects) {
+    const tagSlugs = project.tags.map((item) => item.tag.slug)
+    const domainSlugs = inferDomainSlugs({
+      name: project.name,
+      nameEn: project.nameEn,
+      description: project.description,
+      descriptionEn: project.descriptionEn,
+      tagSlugs,
+    })
+
+    for (const domainSlug of domainSlugs) {
+      const domainTagId = canonicalTagIdMap.get(domainSlug)
+      if (!domainTagId) {
+        throw new Error(`Missing canonical domain tag id: ${domainSlug}`)
+      }
+
+      createData.push({
+        projectId: project.id,
+        tagId: domainTagId,
+      })
+      distribution.set(domainSlug, (distribution.get(domainSlug) || 0) + 1)
+    }
+  }
+
+  const insertedLinks = await prisma.projectTag.createMany({
+    data: createData,
+    skipDuplicates: true,
+  })
+
+  const distributionSummary = DOMAIN_SCENARIO_PRESET_TAGS.map((item) => ({
+    slug: item.slug,
+    name: item.name,
+    projectCount: distribution.get(item.slug) || 0,
+  }))
+
+  console.log('[domain] done', {
+    canonicalDomainTagCount: DOMAIN_SCENARIO_PRESET_TAGS.length,
+    clearedCanonicalDomainLinks: clearedLinks.count,
+    insertedDomainLinks: insertedLinks.count,
+    activeProjectCount: projects.length,
+  })
+  console.log('[domain] distribution', distributionSummary)
+}
+
+main()
+  .catch((error) => {
+    console.error('[domain] failed', error)
+    process.exit(1)
+  })
+  .finally(async () => {
+    await prisma.$disconnect()
+  })
diff --git a/src/app/api/discovery/lib/discovery-service.ts b/src/app/api/discovery/lib/discovery-service.ts
index 1fa13f7..4f6393b 100644
--- a/src/app/api/discovery/lib/discovery-service.ts
+++ b/src/app/api/discovery/lib/discovery-service.ts
@@ -405,7 +405,8 @@ export async function upsertTags(tags: ProjectInput['tags']) {
       })
       const shouldUpdateNameEn = incomingTag.nameEn && !matchedTag.nameEn
       const shouldUpdateCategory =
-        matchedTag.category === 'FREE_TAG' && inferredCategory !== 'FREE_TAG'
+        matchedTag.category !== inferredCategory &&
+        ['FREE_TAG', 'RESOURCE_TYPE', 'PROTOCOL_INTERFACE'].includes(matchedTag.category)
 
       if (shouldUpdateNameEn || shouldUpdateCategory) {
         const updatedTag = await prisma.tag.update({
diff --git a/src/lib/tag-taxonomy.ts b/src/lib/tag-taxonomy.ts
index cf7b607..b257897 100644
--- a/src/lib/tag-taxonomy.ts
+++ b/src/lib/tag-taxonomy.ts
@@ -23,6 +23,71 @@ export const FIXED_PROJECT_TYPE_TAGS = [
   },
 ] as const
 
+export const DOMAIN_SCENARIO_PRESET_TAGS = [
+  {
+    slug: 'code-dev',
+    name: '开发者工具/代码',
+    nameEn: 'Developer Tools & Coding',
+  },
+  {
+    slug: 'automation-workflow',
+    name: '自动化/工作流/RPA',
+    nameEn: 'Automation, Workflow & RPA',
+  },
+  {
+    slug: 'knowledge-rag',
+    name: '知识管理/检索/RAG',
+    nameEn: 'Knowledge Management, Retrieval & RAG',
+  },
+  {
+    slug: 'education-research',
+    name: '教育/研究资源',
+    nameEn: 'Education & Research Resources',
+  },
+  {
+    slug: 'model-inference',
+    name: '模型训练/推理',
+    nameEn: 'Model Training & Inference',
+  },
+  {
+    slug: 'api-integration',
+    name: '协议/API/集成',
+    nameEn: 'Protocol, API & Integration',
+  },
+  {
+    slug: 'vision-multimodal',
+    name: '计算机视觉/多模态',
+    nameEn: 'Computer Vision & Multimodal',
+  },
+  {
+    slug: 'data-bi',
+    name: '数据分析/BI/可视化',
+    nameEn: 'Data Analytics, BI & Visualization',
+  },
+  {
+    slug: 'security-privacy',
+    name: '安全/隐私',
+    nameEn: 'Security & Privacy',
+  },
+  {
+    slug: 'enterprise-office',
+    name: '企业应用/办公',
+    nameEn: 'Enterprise Applications & Office',
+  },
+  {
+    slug: 'finance',
+    name: '金融',
+    nameEn: 'Finance',
+  },
+  {
+    slug: 'medical-biomed',
+    name: '医疗/生物医药',
+    nameEn: 'Medical & Biomedicine',
+  },
+] as const
+
+export type DomainScenarioPresetSlug = (typeof DOMAIN_SCENARIO_PRESET_TAGS)[number]['slug']
+
 export type FixedProjectTypeSlug = (typeof FIXED_PROJECT_TYPE_TAGS)[number]['slug']
 
 export const FIXED_PROJECT_TYPE_SLUGS = new Set<FixedProjectTypeSlug>(
@@ -117,34 +182,34 @@ const TECH_STACK_SLUGS = new Set([
   'bun',
   'langchain',
   'langgraph',
+  'pytorch',
+  'transformers',
+  'llamaindex',
+  'agent-framework',
+  'vllm',
+  'litellm',
+  'playwright',
+  'chromadb',
+  'gradio',
+  'streamlit',
+  'vuejs',
 ])
 
 const AI_PARADIGM_SLUGS = new Set([
-  'llm',
+  'ai-agents',
+  'multi-agent-system',
   '大语言模型',
   'rag',
-  'transformers',
-  'pytorch',
   'machine-learning',
   'deep-learning',
   'reinforcement-learning',
   'multimodal',
-  'multimodal-ai',
-  'multi-agent-system',
-  'multi-agent',
-  'autonomous-agents',
-  'vllm',
-  'llamaindex',
-  'agent-framework',
-  'ai-agent-framework',
-  'ai-agents',
+  'natural-language-processing',
+  'model-context-protocol',
+  'sdk',
 ])
 
 const PROTOCOL_INTERFACE_SLUGS = new Set([
-  'model-context-protocol',
-  'mcp-protocol',
-  'openai-api',
-  'sdk',
   'api-gateway',
 ])
 
@@ -154,28 +219,39 @@ const PRODUCT_FORM_SLUGS = new Set([
   '桌面应用',
   'vs-code-extension',
   'workflow-automation',
+  'browser-automation',
+  'knowledge-base',
   'automation',
 ])
 
 const DOMAIN_SCENARIO_SLUGS = new Set([
+  ...DOMAIN_SCENARIO_PRESET_TAGS.map((item) => item.slug),
   'data-analytics',
   '数据分析',
   'knowledge-management',
   '知识管理',
   'ai-security',
-  'natural-language-processing',
-  'nlp',
+  'knowledge-graph',
   'computer-vision',
+  'visualization',
+  'enterprise-ai',
+  'chatbot',
 ])
 
-const RESOURCE_TYPE_SLUGS = new Set([
-  'knowledge-base',
-  'markdown',
-  'ai-research',
-  'guide',
-  'tutorial',
-  'paper',
-])
+const RESOURCE_TYPE_SLUGS = new Set<string>([])
+
+const TAG_SLUG_ALIAS_MAP: Record<string, string> = {
+  mcp: 'model-context-protocol',
+  'mcp-protocol': 'model-context-protocol',
+  llm: '大语言模型',
+  'llm-applications': '大语言模型',
+  'autonomous-agents': 'ai-agents',
+  'multi-agent': 'multi-agent-system',
+  'multimodal-ai': 'multimodal',
+  'ai-agent-framework': 'agent-framework',
+  'workflow-orchestration': 'workflow-automation',
+  'web-automation': 'browser-automation',
+}
 
 const TECH_STACK_KEYWORDS = [
   'python',
@@ -210,13 +286,14 @@ const AI_PARADIGM_KEYWORDS = [
   'multi agent',
   '智能体',
   'agent',
+  'mcp',
+  'sdk',
 ]
 
 const PROTOCOL_INTERFACE_KEYWORDS = [
-  'mcp',
+  'api gateway',
+  'gateway',
   'protocol',
-  'api',
-  'sdk',
   '接口',
   '协议',
 ]
@@ -235,6 +312,24 @@ const PRODUCT_FORM_KEYWORDS = [
 ]
 
 const DOMAIN_SCENARIO_KEYWORDS = [
+  'domain',
+  'scenario',
+  'workflow',
+  'automation',
+  'rag',
+  'retrieval',
+  'developer',
+  'coding',
+  'medical',
+  'health',
+  'biomed',
+  'financial',
+  'trading',
+  'enterprise',
+  'office',
+  'api integration',
+  'visualization',
+  'dashboard',
   'security',
   'analysis',
   'knowledge',
@@ -243,30 +338,33 @@ const DOMAIN_SCENARIO_KEYWORDS = [
   'speech',
   'robot',
   'finance',
+  'integration',
   '安全',
   '分析',
   '知识',
+  '检索',
+  '自动化',
+  '工作流',
+  '开发者',
+  '编程',
+  '代码',
+  '协议',
+  '集成',
+  '企业',
+  '办公',
+  '医疗',
+  '医药',
+  '医学',
+  '生物医学',
+  '金融',
+  '交易',
+  '量化',
+  '隐私',
   '语音',
   '视觉',
 ]
 
-const RESOURCE_TYPE_KEYWORDS = [
-  'guide',
-  'tutorial',
-  'paper',
-  'list',
-  'awesome',
-  'docs',
-  'documentation',
-  'resource',
-  '指南',
-  '教程',
-  '论文',
-  '合集',
-  '文档',
-  '资源',
-  '课程',
-]
+const RESOURCE_TYPE_KEYWORDS: string[] = []
 
 const PROJECT_DOC_KEYWORDS = [
   ...RESOURCE_TYPE_KEYWORDS,
@@ -301,22 +399,18 @@ const PROJECT_MODEL_TAG_SLUGS = new Set([
 
 const PROJECT_DOC_TAG_SLUGS = new Set([
   'knowledge-base',
-  'markdown',
-  'ai-research',
 ])
 
 const PROJECT_TOOL_TAG_SLUGS = new Set([
   'ai-development-tool',
   'agent-framework',
-  'ai-agent-framework',
   'ai-agents',
   'mcp',
   'model-context-protocol',
-  'mcp-protocol',
   'cli',
   'workflow-automation',
+  'browser-automation',
   'automation',
-  'openai-api',
   'sdk',
   'web-application',
   '桌面应用',
@@ -358,27 +452,29 @@ export function inferTagCategory(input: {
   nameEn?: string | null
 }): TagCategory {
   const rawSlug = input.slug.trim().toLowerCase()
-  if (isFixedProjectTypeSlug(rawSlug)) {
+  const canonicalSlug = TAG_SLUG_ALIAS_MAP[rawSlug] ?? rawSlug
+
+  if (isFixedProjectTypeSlug(canonicalSlug)) {
     return 'FIXED_PROJECT_TYPE'
   }
-  const normalizedSlug = normalize(rawSlug)
+  const normalizedSlug = normalize(canonicalSlug)
 
-  if (TECH_STACK_SLUGS.has(input.slug)) {
+  if (TECH_STACK_SLUGS.has(canonicalSlug)) {
     return 'TECH_STACK'
   }
-  if (AI_PARADIGM_SLUGS.has(input.slug)) {
+  if (AI_PARADIGM_SLUGS.has(canonicalSlug)) {
     return 'AI_PARADIGM'
   }
-  if (PROTOCOL_INTERFACE_SLUGS.has(input.slug)) {
+  if (PROTOCOL_INTERFACE_SLUGS.has(canonicalSlug)) {
     return 'PROTOCOL_INTERFACE'
   }
-  if (PRODUCT_FORM_SLUGS.has(input.slug)) {
+  if (PRODUCT_FORM_SLUGS.has(canonicalSlug)) {
     return 'PRODUCT_FORM'
   }
-  if (DOMAIN_SCENARIO_SLUGS.has(input.slug)) {
+  if (DOMAIN_SCENARIO_SLUGS.has(canonicalSlug)) {
     return 'DOMAIN_SCENARIO'
   }
-  if (RESOURCE_TYPE_SLUGS.has(input.slug)) {
+  if (RESOURCE_TYPE_SLUGS.has(canonicalSlug)) {
     return 'RESOURCE_TYPE'
   }
 
@@ -386,9 +482,6 @@ export function inferTagCategory(input: {
   const normalizedNameEn = normalize(input.nameEn || '')
   const mergedText = `${normalizedSlug} ${normalizedName} ${normalizedNameEn}`
 
-  if (includesAny(mergedText, RESOURCE_TYPE_KEYWORDS)) {
-    return 'RESOURCE_TYPE'
-  }
   if (includesAny(mergedText, TECH_STACK_KEYWORDS)) {
     return 'TECH_STACK'
   }
@@ -405,7 +498,8 @@ export function inferTagCategory(input: {
     return 'DOMAIN_SCENARIO'
   }
 
-  return 'FREE_TAG'
+  // Free tags are deprecated in this project; default to tech stack for unknown slugs.
+  return 'TECH_STACK'
 }
 
 export function inferProjectTypeSlug(input: {