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Data API Builder - Get a visual config UI

With the Data API builder, you can easily generate an API on top of an existing database. However typing out the configuration settings in the dab-config.json isn't much fun. The auto-entities features I talked about before can certainly help, but that is not always the right solution. With the integrated GUI in the MSSQL extension for Visual Studio Code, you can replace the manual JSON configuration with a visual interface that handles entity selection, CRUD permission mapping, API type targeting, and Docker-based local deployment — all without leaving the editor. This post covers exactly what the UI does, what it generates, and where it falls short. Entry points The DAB configuration view is accessible from two places: Object Explorer — right-click a database node → Build Data API (Preview)... Schema Designer — Design API button (top-right toolbar) or the Backend icon in the left panel Both open the same configuration surface. Entity selection Tables a...
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Microsoft Agent Framework- Workflow lifetime

While creating a workflow system with the Microsoft Agents SDK, I encountered the following error message when testing my workflow: System.InvalidOperationException: Cannot use a Workflow that is already owned by another runner or parent workflow. at Microsoft.Agents.AI.Workflows.Workflow.TakeOwnership(...) at InProcessRunnerContext..ctor(...) at InProcessRunner.CreateTopLevelRunner(...) It's cryptic if you haven't seen it before. But once you understand the ownership model, the fix is straightforward. What's actually happening .NET workflow runtimes treat workflow instances as stateful, non-reentrant objects. When a runner picks up a workflow, it takes exclusive ownership of that instance. No other runner — and no parent workflow — is allowed to touch it while that ownership is held. This is by design. Workflows accumulate state as they execute, and allowing two runners to share that state simultaneously would corrupt it. The runtime enforces ow...
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Expose your stored procedures as AI agent tools with DAB 2.0

Data API builder 2.0 (currently in public preview) is a major release focused on MCP and AI integration. Among its headline features is the ability to expose stored procedures as custom MCP tools , making them discoverable and callable by AI agents. No glue code, no middleware, no extra plumbing. In this post I'll walk through how the feature works, and show a practical example: wiring up a full-text search stored procedure as its own dedicated tool that any MCP client can discover and call by name. The idea: a dedicated search tool By default, DAB's SQL MCP Server exposes tables and views through generic DML tools — things like list_books , get_book , and so on. These are useful for straightforward CRUD, but they're not designed for complex operations like full-text search. With custom-tool: true , you can go further. Set that flag on a stored-procedure entity and DAB dynamically registers the procedure as a named, purpose-built tool in tools/list . The AI agent di...
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DAB 2.0 Preview: Autoconfiguration with autoentities

If you've been maintaining a large dab-config.json , you know the pain: every table, view, and stored procedure needs its own entities block. Schema grows, config grows. Someone adds a table and forgets to update the config, and suddenly your API is silently missing endpoints. DAB 2.0 Preview introduces autoentities — a pattern-based approach that discovers and exposes database objects automatically, every time DAB starts. This post covers how it works, how to configure it from the CLI, and what to watch for. Getting started As DAB 2.0 is still in preview, you first need to install the preview version: dotnet tool install microsoft.dataapibuilder --prerelease Note: MSSQL data sources only, for now. Initialize a new dab-config.json file if it doesn't exists yet: dotnet dab init Remark:  Notice that we prefix dab with dotnet to avoid collisions with the globally installed release version. How it works Instead of defining each entity explicitly, you define one ...
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Fixing the "Newer version of Aspire.Hosting.AppHost required" error

After pulling some NuGet packages into my .NET Aspire project, I ran into this cryptic startup failure: Aspire.Hosting.DistributedApplicationException: Newer version of the Aspire.Hosting.AppHost package is required to run the application. Ensure you are referencing at least version '13.2.2'. at Aspire.Hosting.Dcp.DcpDependencyCheck.EnsureDcpVersion(DcpInfo dcpInfo) at Aspire.Hosting.Dcp.DcpDependencyCheck.GetDcpInfoAsync(...) at Aspire.Hosting.Dcp.DcpHost.StartAsync(...) The app host refuses to start, and the logs point you toward a version check deep inside DCP internals. The error message tells me that a minimum version of the hosting package is required,but no matter how many times I ran dotnet restore or update NuGet packages through Visual Studio, the error persists. That's because there are two places that pin the Aspire version. Why updating NuGet packages isn't enough Aspire AppHost projects use a special SDK reference at the very...
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Microsoft Agent Framework–Building a multi-agent workflow with DevUI in .NET

Yesterday, I created a minimal .NET project with DevUI and registered a couple of standalone agents. That gets you surprisingly far for interactive testing. But real business scenarios quickly outgrow a single agent: you need data flowing through multiple specialized steps, decisions being made along the way, and a clear picture of the whole pipeline. That's what workflows are for. In this post, we'll build a content review pipeline as a concrete example — a Writer agent drafts a response, a Reviewer agent critiques it, and a deterministic formatting step finalizes the output. All of it visualized in DevUI. Agents vs Workflows — the key distinction The Agent Framework docs put it cleanly: an agent is LLM-driven and dynamic — it decides which tools to call and in what order, based on the conversation. A workflow is a predefined graph of operations, some of which may be AI agents, but the topology is explicit and deterministic . You decide exactly what runs after what. ...
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Microsoft Agent Framework - Getting started with DevUI in .NET

If you've been exploring the Microsoft Agent Framework , you've probably seen the Python DevUI example showcased prominently in the docs. DevUI is a fantastic inner-loop tool — it lets you visually inspect your agents: their messages, reasoning steps, tool calls, and conversation state, all in a browser dashboard while you develop locally. Think of it as Swagger UI, but for AI agents. The problem? When I went looking for a .NET / C# equivalent , I couldn't find one. The official Microsoft Learn page for DevUI samples simply said: "DevUI samples for C# are coming soon." — Not great when you're trying to ship. So I built one. This post walks through a complete, working .NET Core example using Microsoft Agent Framework 1.0, with DevUI wired up and ready to go. What is DevUI? DevUI is a lightweight developer dashboard shipped as part of the Microsoft Agent Framework. It is not intended for production — it's a local dev tool, similar in spirit to what...
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