2025

October 2025

Agent Builder Updates

October 20th, 2025

We’ve shipped several more improvements to Agent Builder:

  • Selectable suggestions in chat. You can now choose from multiple suggestions when Agent Builder offers options.
Agent Builder conversational interface showing CRM selection between HubSpot and Salesforce for building a renewal risk monitoring agent
Agent Builder helping build a Workflow with CRM integration selection
  • Integration Context Awareness. Previously, if you connected integrations like Notion, Slack, etc., Agent Builder could not access the context of the integrations. Now, it can invoke tools directly to create better Scenarios and Workflows. For example, it can look up a Slack Channel ID without you needing to manually find it in Slack.
  • Improved Runtime Error Debugging. Agent Builder is now much better at reading the results of the last Workflow run. This means Agent Builder is now much better at fixing certain runtime errors.
  • Better relative date handling. Agent Builder now uses more dynamic logic when building Agents that use relative dates, like “look at all tickets closed in Jira or Linear in the last two weeks.” Previously it had a tendency to hardcode dates, but now they will be relative to the moment the Agent / Workflow is executed.
  • Native integration reliability improvements. We’ve fixed several bugs and improved reliability when adding native integrations to Agent Nodes.

Claude Haiku 4.5 Model

October 15th, 2025

We’ve added support for Anthropic’s latest model Claude Haiku 4.5.

Agent Builder Updates

October 14th, 2025

We’ve shipped several improvements to Agent Builder:

  • Threads are now generally available. You can now leave and return to Agent Builder to continue a conversation without losing your progress. You can also create multiple conversation threads to organize different development sessions and ideas as you develop your Workflows.
  • Ports support. Agent Builder now supports Ports in Workflows. You can ask Agent Builder to create Workflows that use Ports to structure data flow between Nodes.
  • Model selection and utilization. We’ve made several improvements to model selection and utilization. Agent Builder will no longer select invalid models and has better awareness of features & configureation options available on different popular models such as Claude, Gemini, and OpenAI.
  • Deployment Node support. Agent Builder now supports Prompt Deployment Nodes and Workflow Deployment Nodes. You can use version-controlled, deployed Prompts and Workflows directly in the Workflows that Agent Builder helps you build.
  • Documents support. Improved how Agent Builder handles native document inputs to reduce errors and streamline setup.
  • Document Index support. Agent Builder can now create Document Indexes and view files within them. Agent Builder can set up and configure your document storage directly while building your Workflow.
  • UX improvements. The “Proceed with plan” flow is now smoother, setting up multiple integrations at once is clearer, and you’ll now see a button to open the inputs panel directly from Agent Builder chat when needed.
  • Reliability & performance improvements. Map Nodes now handle inputs from Prompt Nodes better and have improved output handling. Behind the scenes, we’ve made optimizations to improve latency and reduce crashes, especially when working with Workflows that contain Map Nodes.

GPT-5 Pro Models

October 6th, 2025

We’ve added support for OpenAI’s latest GPT-5 Pro models:

  • gpt-5-pro
  • gpt-5-pro-2025-10-06

Agent Builder - Generate Agent Nodes with Integration Tools

October 3rd, 2025

Agent Builder now automatically creates Agent Nodes with the right integration tools when you ask it to use integrations in your Workflows. It configures all the appropriate tools and API calls for you.

If a tool is not supported as a native integration in Vellum, Agent Builder can create custom tools using Python, Agent handoffs, Inline Subworkflows, version-controlled Deployed Subworkflows, and more.

Agent Node overview showing configured tools including Create linear issue, List linear projects, Fetch Notion Block Children, Fetch Notion Data, and Search Notion page
Agent Node configured with integration tools for Notion and Linear
Workflow execution view displaying Agent Node with tool call history and final output showing integration functionality
Workflow execution showing tool call history for streaming progress and debugging

Agent Builder - Configure Integrations

October 3rd, 2025

You can now configure third-party integrations directly from Agent Builder. Previously, you had to set them up outside of Vellum using Composio or manually configure API keys. Now, Agent Builder prompts you to connect integrations directly when it needs them for your Workflow.

We currently support: Slack, Notion, Google, Calendly, Hubspot, Linear, Github, Google Sheets, Google Calendar, Google Drive, and Gmail, with more coming soon.

Agent Builder interface showing Connect Notion and Connect Linear buttons with example workflow plan
Agent Builder prompts you to connect required integrations directly from the interface
Integration selection modal showing available platforms including Slack, Notion, Google, Calendly, Hubspot, Linear, Github, Google Sheets, Google Calendar, and Google Drive
Available integration tools displayed in the integration selection modal

Structured Outputs for Groq Models

October 2nd, 2025

We now support structured outputs for Groq models, making it easier to reliably parse responses that conform to your expected schemas.