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Aelita Harness is a microkernel AI agent runtime framework based on .NET 10, designed with a plug-in architecture. It supports 79 plugins, 12 LLM providers, and Discord integration. This article deeply analyzes its architectural design, agent loop mechanism, memory system, and multi-model collaboration capabilities, providing references for building scalable AI agent systems.
Section 01
Aelita Harness is a microkernel AI agent runtime framework based on .NET 10, designed with a plug-in architecture. It supports 79 plugins, 12 LLM providers, and Discord integration. This article analyzes its architectural design, agent loop mechanism, memory system, and multi-model collaboration capabilities, providing references for building scalable AI agent systems.
Section 02
With the rapid improvement of large language model (LLM) capabilities, building stable, scalable, and easily customizable AI agent systems has become a focus for developers. Traditional monolithic architectures struggle to adapt to changing requirements and multi-model collaboration scenarios. Aelita Harness adopts the microkernel architecture concept, completely decoupling the core runtime from functional extensions, providing a new technical path.
Section 03
Aelita is built around 35 plugin slots (23 singleton slots, 12 collection slots). The core kernel has only about 500 lines of code, and all functions are implemented via plugins. The agent loop uses a two-layer structure: the outer layer handles conversation follow-up (including plugin callbacks, context compression, memory prefetching, etc.), while the inner layer processes tool calls and strategy adjustments.
Section 04
It supports 12 LLM providers (7 API providers, 3 CLI tools), including mechanisms like streaming responses and failover chains. The memory system uses a hybrid search of file storage + BM25 + cosine similarity, including active prefetching, experiential memory, Vault knowledge base, and memory reminder functions to maintain the coherence of long conversations.
Section 05
It has a built-in "conscience" behavior constraint system (drift detection, tool gating, behavior guardrails) and supports Lua script extensions. Configuration files are stored in the ~/.aelita/ directory, and deployment methods are flexible (interactive mode, one-time execution, Discord daemon mode).
Section 06
The project includes 53 source code projects, 54 test projects, over 2500 test cases, about 62,000 lines of source code, 57,000 lines of test code, 79 plugins, 12 LLM providers, and 68 tools. The ratio of test code to source code is nearly 1:1, reflecting the emphasis on quality.
Section 07
Key highlights include: microkernel architecture (streamlined core), complete dependency injection, two-layer agent loop, hybrid memory search, and multi-model failover strategy, providing reference ideas for AI agent framework development.
Section 08
Aelita Harness represents the direction of AI agent frameworks from monolithic to microkernel, closed to plug-in, and single-model to multi-model collaboration. It provides code and architectural pattern references for production-level AI agent systems and will play an important role in enterprise deployments.
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