feat: release 2.1.3

docs/releases/overview.mdx

@@ -5,6 +5,7 @@ description: CowAgent version history
 
 | Version | Date | Description |
 | --- | --- | --- |
+| [2.1.3](/releases/v2.1.3) | 2026.07.08 | Desktop client released (macOS / Windows), knowledge base document management, on-demand MCP tool retrieval, Traditional Chinese support, new models (claude-sonnet-5, doubao-seed-2.1, etc.), security hardening and refinements |
 | [2.1.2](/releases/v2.1.2) | 2026.06.18 | Web Console upgrades (scheduled task management, knowledge base categories, multiple custom model providers), Self-Evolution improvements, new models (kimi-k2.7-code, glm-5.2), security hardening and refinements |
 | [2.1.1](/releases/v2.1.1) | 2026.06.09 | Self-Evolution, Web Console message management and parallel sessions, cross-platform MCP enhancements with concurrent calls, new models (MiniMax-M3, qwen3.7-plus, etc.), various improvements |
 | [2.1.0](/releases/v2.1.0) | 2026.06.01 | Internationalization, new Telegram / Discord / Slack / WeChat Customer Service channels, CLI interaction upgrades (streaming output, fuzzy command matching, task cancellation), MCP Streamable HTTP, new models |

docs/releases/v2.1.3.mdx

@@ -0,0 +1,74 @@
+---
+title: v2.1.3
+description: "CowAgent 2.1.3: Desktop client for macOS / Windows, enhanced knowledge base document management, on-demand MCP tool retrieval, Traditional Chinese support, new models, plus security and experience improvements"
+---
+
+🌐 [English](https://docs.cowagent.ai/releases/v2.1.3) | [中文](https://docs.cowagent.ai/zh/releases/v2.1.3)
+
+## 🖥 Desktop Client
+
+Introducing the **CowAgent Desktop client** for **macOS and Windows** — your local super AI assistant, truly ready to use out of the box.
+
+Download: [CowAgent Desktop](https://cowagent.ai/download/)
+
+<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/screenshots/en/desktop-chat-demo-en.png" alt="CowAgent Desktop client" />
+
+Highlights:
+
+- **Out of the box**: the full Agent runtime is bundled — launch right after install, no need to set up Python or other dependencies
+- **Full chat experience**: streaming replies, session management, tool-call step display, Markdown rendering, plus sending and previewing images / videos / files
+- **Visual management**: configuration, models, knowledge base, scheduled tasks, skills, and memory pages mirror the Web console, all manageable in the native UI
+- **Channel onboarding**: connect messaging channels by scanning a QR code right inside the app
+- **Auto update**: automatic version checks and one-click updates, with download speed optimized across regions
+- **Native experience**: first-run onboarding, follows the system language, and platform-adaptive window interactions
+
+
+## 📚 Knowledge Base
+
+- **Create & import documents**: create new documents or import external ones directly from the UI
+- **Automatic index maintenance**: the knowledge base index is rebuilt automatically from the actual directory tree, preventing index drift or lost documents
+- **Vectorization fix**: the index now reuses the unified embedding provider, ensuring real semantic vectors instead of falling back to keyword search
+
+Thanks @yangziyu-hhh
+
+Docs: [Knowledge Base](https://docs.cowagent.ai/memory/knowledge)
+
+## 🔌 On-demand MCP Tool Retrieval
+
+To address context bloat when many MCP tools are connected, we added **on-demand tool retrieval**: relevant MCP tools are loaded on demand via RAG vector search based on the current task, reducing the context taken up by irrelevant tools. Thanks @fengyl07
+
+Docs: [MCP Tools](https://docs.cowagent.ai/tools/mcp)
+
+## 🌏 Traditional Chinese Support
+
+The Web console, logs, and documentation now support **Traditional Chinese (zh-Hant)**; the interface language can follow the system or be switched manually. Thanks @anomixer (#2935)
+
+## 🤖 New Models
+
+- Added support for **claude-sonnet-5** and **claude-fable-5**
+- Added support for **doubao-seed-2-1-pro** and **doubao-seed-2-1-turbo**
+
+Docs: [Models](https://docs.cowagent.ai/models)
+
+## 🔒 Security Hardening
+
+- **Sensitive file read protection**: hardened access to credential and other sensitive files to prevent bypass reads. Thanks @fengyl07 (#2913)
+- **Browser access protection**: blocks browser requests targeting internal network and cloud server internal endpoints, reducing the risk of being tricked into reaching internal services. Thanks @christop
+- **Safer config parsing**: config content is parsed in a safer way to avoid potential code execution risks. Thanks @shunfeng8421
+
+## 🛠 Improvements & Fixes
+
+- **Custom provider support**: embedding and vision models can now use custom providers; also fixed a memory query issue on Windows. Thanks @HnBigVolibear
+- **More reliable file editing**: better preserves original indentation, and fuzzy matching no longer touches unrelated content. Thanks @xiaweiwei67-stack (#2942)
+- **Command output encoding fix**: fixed garbled Chinese characters when a command produces large output. Thanks @xiaweiwei67-stack (#2941)
+- **Azure OpenAI fixes**: fixed streaming output and related configuration issues for Azure OpenAI. Thanks @Eric L
+- **WeCom Smart Bot**: added channel docs for the webhook (callback) mode. Thanks @6vision
+- **Deep Dream toggle**: added a dedicated `deep_dream_enabled` switch to enable or disable Deep Dream distillation independently.
+- **Stability**: improved connection recycling in the Web service and fixed several Self-Evolution issues (#2924, #2904)
+
+## 📦 How to Upgrade
+
+- **Desktop client**: get the latest version from the [download page](https://cowagent.ai/download/).
+- **Source deployment**: run `cow update` for a one-click upgrade, or pull the latest code and restart. See the [upgrade guide](https://docs.cowagent.ai/guide/upgrade).
+
+**Release date**: 2026.07.08 | [Full Changelog](https://github.com/zhayujie/CowAgent/compare/2.1.2...2.1.3)