Blog

Updates and insights from the FabrCore project.

Batch Embeddings API — 1000x Fewer HTTP Calls

FabrCore now supports batch embedding requests, singleton client caching, and native batch in memory tools — collapsing thousands of HTTP round-trips into a single call.

Eric Brasher February 23, 2026 at 8:45 AM

All Articles

Engineering

Batch Embeddings API — 1000x Fewer HTTP Calls

February 23, 2026 at 8:45 AM • 6 min read

Batch embedding requests, singleton client caching, and native batch in memory tools — collapsing thousands of HTTP round-trips into one call.

Engineering

ChatDock Message Filter Callback

February 23, 2026 at 7:50 AM • 5 min read

OnMessageReceived is now a Func<AgentMessage, Task<bool>> — return true to display, false to suppress. Migration guide and message type conventions.

Engineering

ChatDock Events & Subscriptions: Three Patterns for Agent-to-UI Communication

February 21, 2026 at 5:45 PM • 8 min read

EventCallback parameters, IClientContext events, and ChatDockManager state changes — three ways to get agent messages into your Blazor parent components.

Engineering

Health Monitoring Guide for FabrCore

February 21, 2026 at 11:49 AM • 5 min read

Use FabrCore's diagnostics endpoints with ASP.NET Core health checks for aggregated monitoring — no custom health agents needed.

Engineering

Structured Output with FabrCore

February 21, 2026 at 11:37 AM • 4 min read

Use Microsoft.Extensions.AI's structured output APIs for reliable JSON parsing from LLMs instead of building custom parsers.

Engineering

Security Best Practices for FabrCore Tools

February 21, 2026 at 11:21 AM • 5 min read

Input validation, allowlists, and sandboxing patterns for building secure FabrCore tools — security is your application's responsibility.

Engineering

Understanding the Actor Model in FabrCore

February 21, 2026 at 11:08 AM • 5 min read

Why FabrCore agents are isolated Orleans grains, and why sharing tools or state across agents contradicts the architecture.

Engineering

Tool Invocation Logging in FabrCore

February 21, 2026 at 10:52 AM • 4 min read

Use Microsoft.Extensions.AI's UseLogging() middleware to capture tool calls, arguments, and results through standard ILogger.

Engineering

Cross-Platform File Storage in FabrCore

February 21, 2026 at 10:45 AM • 4 min read

How to configure FileStorageSettings.StoragePath correctly for WSL and Linux environments to avoid hardcoded Windows paths.

Engineering

Configuration Validation Patterns in FabrCore

February 21, 2026 at 10:33 AM • 5 min read

A practical checklist for validating FabrCore configuration — catch missing API keys, empty models, and bad JSON before startup.

Engineering

Chat History Compaction Strategies

February 21, 2026 at 10:18 AM • 5 min read

How to use FabrCore's built-in CompactionService and TryCompactAsync to manage chat history growth before it hits context limits.

Engineering

Progress Notifications in FabrCore

February 21, 2026 at 10:07 AM • 4 min read

Implement real-time progress feedback using SendMessage with OneWay kind — no dedicated streaming API needed.

Engineering

Message Routing Patterns in FabrCore

February 21, 2026 at 9:55 AM • 5 min read

Use Channel, MessageType, and Kind fields for routing within OnMessage instead of building external routing infrastructure.

Engineering

Managing Plugin Resources in FabrCore

February 21, 2026 at 9:48 AM • 4 min read

Handle resource cleanup in FabrCore plugins using IDisposable and IAsyncDisposable — no custom lifecycle hooks needed.

Engineering

Agent Delegation Best Practices

February 21, 2026 at 9:42 AM • 5 min read

Build agent delegation workflows using FabrCore's health APIs and messaging primitives instead of custom orchestration layers.

Engineering

Working with Plugin Settings in FabrCore

February 21, 2026 at 9:31 AM • 4 min read

FabrCore's plugin settings convention through AgentConfiguration.Args — the GetPluginSetting pattern and best practices.

Engineering

Agent Discovery Patterns in FabrCore

February 21, 2026 at 9:23 AM • 5 min read

Understanding FabrCore's two-scope agent tracking architecture and how to query agents without custom merge services.

Engineering

Leveraging FabrCore's Built-in Discovery System

February 21, 2026 at 9:12 AM • 4 min read

FabrCore already includes assembly scanning for agents, plugins, and tools — use AdditionalAssemblies instead of custom discovery.

Engineering

Plugin Service Resolution in FabrCore

February 21, 2026 at 9:05 AM • 4 min read

How FabrCore resolves IFabrCoreAgentHost during InitializeAsync via PluginServiceProvider — and common pitfalls to avoid.

Release

MCP Server Support for FabrCore Agents

February 21, 2026 at 7:35 AM • 5 min read

Connect MCP servers to your agents for access to external tools like GitHub, filesystem, and databases — zero code changes required.

Engineering

Building a DelegateAgent on FabrCore

February 20, 2026 at 3:40 PM • 10 min read

Learn how to build an LLM-powered supervisor agent that routes user messages to the best specialist via a 4-step pipeline.

Announcement

Why We Renamed Fabr to FabrCore

February 20, 2026 at 2:10 PM • 3 min read

The story behind the rename — domain availability, naming doubts, and landing on a name that actually fits.