v0.8.1-rc2

## What's Changed

### ✨ Features

* 🪨 feat: Add Bedrock Prompt Caching Support by [@dustinhealy](https://github.com/dustinhealy) in [#8271](https://github.com/danny-avila/LibreChat/pull/8271)
* 🤖 feat: Agent Handoffs (Routing) by [@danny-avila](https://github.com/danny-avila) in [#10176](https://github.com/danny-avila/LibreChat/pull/10176)
* 👑 feat: Distributed Leader Election with Redis for Multi-instance Coordination by [@nhtruong](https://github.com/nhtruong) in [#10189](https://github.com/danny-avila/LibreChat/pull/10189)
* 💡 feat: Improve reasoning (thinking) content display, copy-to-clipboard, and error handling by [@berry-13](https://github.com/berry-13) in [#10278](https://github.com/danny-avila/LibreChat/pull/10278)
* 🌉 feat: Integrate Helicone AI Gateway Provider by [@juliettech13](https://github.com/juliettech13) in [#10287](https://github.com/danny-avila/LibreChat/pull/10287)
* ✨ feat: Artifact Management Enhancements, Version Control, and UI Refinements by [@danny-avila](https://github.com/danny-avila) in [#10318](https://github.com/danny-avila/LibreChat/pull/10318)
* 🔐 feat: Prioritize Provider ID Over Email for Social Login by [@danny-avila](https://github.com/danny-avila) in [#10358](https://github.com/danny-avila/LibreChat/pull/10358)
* 🌐 chore: Update tool type from `web_search_preview` to `web_search` for OpenAI by [@danny-avila](https://github.com/danny-avila) in [#10379](https://github.com/danny-avila/LibreChat/pull/10379)
* 🖼️ feat: File Size and MIME Type Filtering at Agent level by [@danny-avila](https://github.com/danny-avila) in [#10446](https://github.com/danny-avila/LibreChat/pull/10446)
* 📜 feat: Configurable Debug Message Length for Logs by [@danny-avila](https://github.com/danny-avila) in [#10447](https://github.com/danny-avila/LibreChat/pull/10447)
* 🔍 feat: Anthropic/Google Web Search Support via `addParams` / `dropParams` by [@danny-avila](https://github.com/danny-avila) in [#10456](https://github.com/danny-avila/LibreChat/pull/10456)
* 🛝 feat: Default Params via Custom Params by [@danny-avila](https://github.com/danny-avila) in [#10457](https://github.com/danny-avila/LibreChat/pull/10457)
* 🔒 feat: Idempotency check for OAuth Flow Completion by [@danny-avila](https://github.com/danny-avila) in [#10468](https://github.com/danny-avila/LibreChat/pull/10468)
* 🤝 feat: View Artifacts in Shared Conversations by [@berry-13](https://github.com/berry-13) in [#10477](https://github.com/danny-avila/LibreChat/pull/10477)
* 🛡️ feat: Add Model Refusal Error Handling (Anthropic) by [@danny-avila](https://github.com/danny-avila) in [#10478](https://github.com/danny-avila/LibreChat/pull/10478)
* 🔍 feat: `DEBUG_MESSAGE_LENGTH` Environment Variable (pt. 2) by [@danny-avila](https://github.com/danny-avila) in [#10479](https://github.com/danny-avila/LibreChat/pull/10479)
* 🤖 feat: GPT-5.1 by [@danny-avila](https://github.com/danny-avila) in [#10491](https://github.com/danny-avila/LibreChat/pull/10491)
* 🪣 feat: Init Containers and Custom ConfigMaps Support in Helm Chart by [@adaptivegarage](https://github.com/adaptivegarage) in [#10525](https://github.com/danny-avila/LibreChat/pull/10525)
* 👤 feat: Agent Avatar Removal and Decouple upload/reset from Agent Updates by [@berry-13](https://github.com/berry-13) in [#10527](https://github.com/danny-avila/LibreChat/pull/10527)
* 📨 feat: Pass Custom Headers to Model Discovery (`v1/models`) by [@Anthony-Jhoiro](https://github.com/Anthony-Jhoiro) in [#10564](https://github.com/danny-avila/LibreChat/pull/10564)
* 🚩 feat: Add `--provider` flag to create-user script by [@ineiti](https://github.com/ineiti) in [#10572](https://github.com/danny-avila/LibreChat/pull/10572)
* 🔒 feat: Enhance Actions SSRF Protection with Comprehensive IP and Domain Validation by [@danny-avila](https://github.com/danny-avila) in [#10583](https://github.com/danny-avila/LibreChat/pull/10583)
* 🤖 feat: Gemini 3 Support by [@danny-avila](https://github.com/danny-avila) in [#10584](https://github.com/danny-avila/LibreChat/pull/10584)
* ☕ feat: Prevent Screen Sleep During Response Generation by [@michnovka](https://github.com/michnovka) in [#10597](https://github.com/danny-avila/LibreChat/pull/10597)
* 🤖 feat: Claude Opus 4.5 Token Rates and Window Limits by [@danny-avila](https://github.com/danny-avila) in [#10653](https://github.com/danny-avila/LibreChat/pull/10653)

### 🐛 Fixes

* 🔧 fix: Remove Bedrock Config Transform introduced in #9931 by [@danny-avila](https://github.com/danny-avila) in [#10628](https://github.com/danny-avila/LibreChat/pull/10628)
* 🧭 fix: Add Base Path Support for Login/Register and Image Paths by [@catmeme](https://github.com/catmeme) in [#10116](https://github.com/danny-avila/LibreChat/pull/10116)
* 🏷️ fix: Add user ID to MCP tools cache keys by [@ruggishop](https://github.com/ruggishop) in [#10201](https://github.com/danny-avila/LibreChat/pull/10201)
* 📎 fix: Document Uploads for Custom Endpoints by [@maxesse](https://github.com/maxesse) in [#10336](https://github.com/danny-avila/LibreChat/pull/10336)
* 🎙️ fix: Azure OpenAI Speech-to-Text 400 Bad Request Error by [@ConstantTime](https://github.com/ConstantTime) in [#10355](https://github.com/danny-avila/LibreChat/pull/10355)
* 🪞 fix: Prevent Revoked Blob URLs in Uploaded Images (FileRow) by [@danny-avila](https://github.com/danny-avila) in [#10361](https://github.com/danny-avila/LibreChat/pull/10361)
* 🗑️ fix: Delete All Shared Link Deletion on Clear Chats by [@danny-avila](https://github.com/danny-avila) in [#10396](https://github.com/danny-avila/LibreChat/pull/10396)
* 📂 refactor: Cleanup File Filtering Logic, Improve Validation by [@danny-avila](https://github.com/danny-avila) in [#10414](https://github.com/danny-avila/LibreChat/pull/10414)
* 📞 fix: Model End Callback and Streamline Client Cleanup by [@danny-avila](https://github.com/danny-avila) in [#10438](https://github.com/danny-avila/LibreChat/pull/10438)
* 🔐 fix: persist new MCP oauth tokens properly by [@wipash](https://github.com/wipash) in [#10439](https://github.com/danny-avila/LibreChat/pull/10439)
* 🧰 fix: Unprocessed Tool Calls Edge Case by [@danny-avila](https://github.com/danny-avila) in [#10440](https://github.com/danny-avila/LibreChat/pull/10440)
* 🔢 fix: Unescape LaTeX Numbers in Artifact Content Edit by [@danny-avila](https://github.com/danny-avila) in [#10476](https://github.com/danny-avila/LibreChat/pull/10476)
* 🔧 fix: Await MCP Instructions and Filter Malformed Tool Calls by [@danny-avila](https://github.com/danny-avila) in [#10485](https://github.com/danny-avila/LibreChat/pull/10485)
* 🔤 fix: Replace Translation Keys with Localized Text by [@mdutkin](https://github.com/mdutkin) in [#10486](https://github.com/danny-avila/LibreChat/pull/10486)
* 🎨 fix: Correct Read-Only State Logic in Code Editor by [@berry-13](https://github.com/berry-13) in [#10508](https://github.com/danny-avila/LibreChat/pull/10508)
* 📼 fix: Remove Legacy File Upload for Non-agents by [@danny-avila](https://github.com/danny-avila) in [#10517](https://github.com/danny-avila/LibreChat/pull/10517)
* 🐛 fix: Redis Cluster Bug + 🧪 Enhance Test Coverage by [@nhtruong](https://github.com/nhtruong) in [#10518](https://github.com/danny-avila/LibreChat/pull/10518)
* 🗑️ fix: Remove All User Metadata on Deletion by [@WhammyLeaf](https://github.com/WhammyLeaf) in [#10534](https://github.com/danny-avila/LibreChat/pull/10534)
* 🚪 fix: ArtifactsPanel and SidePanel Rendering and Collapsing Behavior by [@danny-avila](https://github.com/danny-avila) in [#10537](https://github.com/danny-avila/LibreChat/pull/10537)
* ➿ fix: `createFileSearchTool` to return tuples for error messages by [@danny-avila](https://github.com/danny-avila) in [#10547](https://github.com/danny-avila/LibreChat/pull/10547)
* ⏳ fix: Async Model End Events, Await Tool Call and Dispatch Handling by [@danny-avila](https://github.com/danny-avila) in [#10552](https://github.com/danny-avila/LibreChat/pull/10552)
* 🔧 fix: Catch Errors in ToolEndHandler and Pass Logger by [@danny-avila](https://github.com/danny-avila) in [#10565](https://github.com/danny-avila/LibreChat/pull/10565)
* 🐛 fix: Error Handling in MCP Tool List Controller by [@danny-avila](https://github.com/danny-avila) in [#10570](https://github.com/danny-avila/LibreChat/pull/10570)
* 🛡️ chore: Enhance Agents Error Handling via `@librechat/agents@v3.0.25` by [@danny-avila](https://github.com/danny-avila) in [#10577](https://github.com/danny-avila/LibreChat/pull/10577)
* 📢 fix: Resolved Screen Reader Issues with `TooltipAnchor` by [@dlew](https://github.com/dlew) in [#10580](https://github.com/danny-avila/LibreChat/pull/10580)
* 📷 fix: Use 'media' type for Google multimodal attachments by [@dustinhealy](https://github.com/dustinhealy) in [#10586](https://github.com/danny-avila/LibreChat/pull/10586)
* 🔒 fix: Disable Redis leader-only mode for shared app and user servers by [@nhtruong](https://github.com/nhtruong) in [#10605](https://github.com/danny-avila/LibreChat/pull/10605)
* 🕸️ fix: Minor Type Issues & Anthropic Web Search by [@danny-avila](https://github.com/danny-avila) in [#10618](https://github.com/danny-avila/LibreChat/pull/10618)
* 🛰️ fix: MCP SSE & Ping Error Handling by [@peeeteeer](https://github.com/peeeteeer) in [#10635](https://github.com/danny-avila/LibreChat/pull/10635)
* 🔗 fix: Resolve Bedrock Tool Call Streaming "Content Type Mismatch" by [@danny-avila](https://github.com/danny-avila) in [#10647](https://github.com/danny-avila/LibreChat/pull/10647)

### 📦 Dependencies & Chores

* 📦 chore: Remove `@langchain/community` & Related Legacy Code by [@danny-avila](https://github.com/danny-avila) in [#10375](https://github.com/danny-avila/LibreChat/pull/10375)
* 📦 chore: Bump `@modelcontextprotocol/sdk` to v1.21.0 by [@danny-avila](https://github.com/danny-avila) in [#10469](https://github.com/danny-avila/LibreChat/pull/10469)
* 📦 chore: Jest & Eslint Package Updates by [@danny-avila](https://github.com/danny-avila) in [#10536](https://github.com/danny-avila/LibreChat/pull/10536)
* 📦 chore: Update Packages for Security & Remove Unnecessary by [@danny-avila](https://github.com/danny-avila) in [#10620](https://github.com/danny-avila/LibreChat/pull/10620)

### 🔧 Refactoring

* 🔄 refactor: MCP Registry System with Distributed Caching by [@nhtruong](https://github.com/nhtruong) in [#10191](https://github.com/danny-avila/LibreChat/pull/10191)
* 🧠 refactor: Improve Reasoning Component Structure and UX by [@danny-avila](https://github.com/danny-avila) in [#10320](https://github.com/danny-avila/LibreChat/pull/10320)
* ⚗️ refactor: Provider File Validation with Configurable Size Limits by [@danny-avila](https://github.com/danny-avila) in [#10405](https://github.com/danny-avila/LibreChat/pull/10405)
* 🤖 refactor: Improve Agent Handoff Context Tracking by [@danny-avila](https://github.com/danny-avila) in [#10553](https://github.com/danny-avila/LibreChat/pull/10553)
* 🔧 refactor: Update Avatar component to improve file selection handling by [@usnavy13](https://github.com/usnavy13) in [#10555](https://github.com/danny-avila/LibreChat/pull/10555)
* 🔬 refactor: Prevent Automatic MCP Server UI Deselection by [@danny-avila](https://github.com/danny-avila) in [#10588](https://github.com/danny-avila/LibreChat/pull/10588)
* 📑 refactor: Skip H1 Rendering for Falsy Header Values in `AuthLayout` by [@NalinNair](https://github.com/NalinNair) in [#10606](https://github.com/danny-avila/LibreChat/pull/10606)
* 🪂 refactor: MCP Server Init Fallback by [@danny-avila](https://github.com/danny-avila) in [#10608](https://github.com/danny-avila/LibreChat/pull/10608)

### 🌍 Internationalization

🌍 Updated translations in [#10323](https://github.com/danny-avila/LibreChat/pull/10323), [#10370](https://github.com/danny-avila/LibreChat/pull/10370), [#10380](https://github.com/danny-avila/LibreChat/pull/10380), [#10397](https://github.com/danny-avila/LibreChat/pull/10397), [#10448](https://github.com/danny-avila/LibreChat/pull/10448), [#10458](https://github.com/danny-avila/LibreChat/pull/10458), [#10481](https://github.com/danny-avila/LibreChat/pull/10481), [#10519](https://github.com/danny-avila/LibreChat/pull/10519), [#10622](https://github.com/danny-avila/LibreChat/pull/10622)

### 📚 Documentation

* 🌅 docs: Add OpenAI Image Gen Env Vars by [@Educg550](https://github.com/Educg550) in [#10335](https://github.com/danny-avila/LibreChat/pull/10335)

## New Contributors
* [@juliettech13](https://github.com/juliettech13) made their first contribution in [#10287](https://github.com/danny-avila/LibreChat/pull/10287)
* [@mdutkin](https://github.com/mdutkin) made their first contribution in [#10486](https://github.com/danny-avila/LibreChat/pull/10486)
* [@adaptivegarage](https://github.com/adaptivegarage) made their first contribution in [#10525](https://github.com/danny-avila/LibreChat/pull/10525)
* [@Anthony-Jhoiro](https://github.com/Anthony-Jhoiro) made their first contribution in [#10564](https://github.com/danny-avila/LibreChat/pull/10564)
* [@dlew](https://github.com/dlew) made their first contribution in [#10580](https://github.com/danny-avila/LibreChat/pull/10580)
* [@NalinNair](https://github.com/NalinNair) made their first contribution in [#10606](https://github.com/danny-avila/LibreChat/pull/10606)
* [@michnovka](https://github.com/michnovka) made their first contribution in [#10597](https://github.com/danny-avila/LibreChat/pull/10597)
* [@catmeme](https://github.com/catmeme) made their first contribution in [#10116](https://github.com/danny-avila/LibreChat/pull/10116)

**Full Changelog**: https://github.com/danny-avila/LibreChat/compare/v0.8.1-rc1...v0.8.1-rc2