Add Simtheory MCP client to client documentation (modelcontextprotocol#1459)

* Add Simtheory MCP client to client documentation

* Fix formatting of Simtheory client update

---------

Co-authored-by: Chris Sharkey <[email protected]>

Author: chrissharkey

docs/clients.mdx

@@ -77,6 +77,7 @@ This page provides an overview of applications that support the Model Context Pr
 | [RecurseChat][RecurseChat]                       | ❌          | ❌        | ✅      | ❓                     | ❌         | ❌    | ❓            |
 | [Roo Code][Roo Code]                             | ✅          | ❌        | ✅      | ❓                     | ❌         | ❌    | ❓            |
 | [Shortwave][Shortwave]                           | ❌          | ❌        | ✅      | ❓                     | ❌         | ❌    | ❓            |
+| [Simtheory][Simtheory]                           | ✅          | ✅        | ✅      | ✅                     | ❌         | ❌    | ❓            |
 | [Slack MCP Client][Slack MCP Client]             | ❌          | ❌        | ✅      | ❓                     | ❌         | ❌    | ❓            |
 | [Sourcegraph Cody][Cody]                         | ✅          | ❌        | ❌      | ❓                     | ❌         | ❌    | ❓            |
 | [SpinAI][SpinAI]                                 | ❌          | ❌        | ✅      | ❓                     | ❌         | ❌    | ❓            |
@@ -168,6 +169,7 @@ This page provides an overview of applications that support the Model Context Pr
 [RecurseChat]: https://recurse.chat/
 [Roo Code]: https://roocode.com
 [Shortwave]: https://www.shortwave.com
+[Simtheory]: https://simtheory.ai
 [Slack MCP Client]: https://github.com/tuannvm/slack-mcp-client
 [Cody]: https://sourcegraph.com/cody
 [SpinAI]: https://spinai.dev
@@ -958,6 +960,23 @@ MooPoint is a web-based AI chat platform built for developers and advanced users
 - Support for both remote (Streamable HTTP and SSE) and local (Stdio) MCP servers
 - AI assistance for managing your emails, calendar, tasks and other third-party services
 
+### Simtheory
+
+Simtheory is an agentic AI workspace that unifies multiple AI models, tools, and capabilities under a single subscription. It provides comprehensive MCP support through its MCP Store, allowing users to extend their workspace with productivity tools and integrations.
+
+**Key features:**
+
+- **MCP Store**: Marketplace for productivity tools and MCP server integrations
+- **Parallel Tasking**: Run multiple AI tasks simultaneously with MCP tool support
+- **Model Catalogue**: Access to frontier models with MCP tool integration
+- **Hosted MCP Servers**: Plug-and-play MCP integrations with no technical setup
+- **Advanced MCPs**: Specialized tools like Tripo3D (3D creation), Podcast Maker, and Video Maker
+- **Enterprise Ready**: Flexible workspaces with granular access control for MCP tools
+
+**Learn more:**
+
+- [Simtheory website](https://simtheory.ai)
+
 ### Slack MCP Client
 
 [Slack MCP Client](https://github.com/tuannvm/slack-mcp-client) acts as a bridge between Slack and Model Context Protocol (MCP) servers. Using Slack as the interface, it enables large language models (LLMs) to connect and interact with various MCP servers through standardized MCP tools.