Extism

Extism

Dylibso
+
+

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About

DeepSeek Harness is an open source agent harness designed to keep AI agents working in real-world environments by helping them understand context, use tools, and continue operating across complex tasks. Built on the Cordis plugin system, every capability is a plugin that can be selected, swapped, extended, or recomposed through configuration without changing the core source code. Plugins provide models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and the UI, while Cordis manages plugin mounting, dependencies, services, and events. Every run is traceable through an append-only session log that records system prompts, reasoning, tool calls and results, subagent scheduling, and context injections. The Trajectory view lets developers inspect these records by source, while resume, fork, search, and replay operate on the same event stream.

About

Extism is an open-source, universal plug-in system to make all software programmable, and it's powered by WebAssembly. In-depth documentation, constantly updated as the project grows. 15+ officially supported Host SDKs, making Extism embeddable in the most popular languages. 7+ officially supported PDKs, to write plug-ins in whichever language a developer would like. A growing set of runtime features makes Extism an excellent plug-in system for apps of all types & sizes. Fully-featured canonical reference demo with Elixir host SDK, and plugins in Rust, TypeScript, & Javascript. Implementation of a turn-based multiplayer game platform and games included to play and review. Games are implemented as WebAssembly modules containing a specific set of exports. Check out the source code on GitHub, download the installer, and get started. 100% open-source code. Fork it, experiment, & run your own game server.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

AI developers and agent-harness builders seeking to create, customize, trace, benchmark, and operate composable AI agents with interchangeable models, tools, skills, runtimes, and infrastructure

Audience

Developers searching for a free solution to write plug-ins for apps of all types and sizes

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version
Free Trial

Pricing

Free
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

DeepSeek
Founded: 2023
China
deepseek.com/harness/en/

Company Information

Dylibso
United States
dylibso.com/products/extism/

Alternatives

Claude Code

Claude Code

Anthropic

Alternatives

AssemblyScript

AssemblyScript

The AssemblyScript Project
OpenClaw

OpenClaw

Molty
Nakama

Nakama

Heroic Labs
StateFabric

StateFabric

J Gregory Technology Ltd.

Categories

Categories

Integrations

C
C++
DeepSeek
DeepSeek-V4-Flash
DeepSeek-V4-Pro
Elixir
Erlang
GitHub
Go
Haskell
Java
JavaScript
Node.js
OCaml
Python
R
Rust
TypeScript
WebAssembly
Zig

Integrations

C
C++
DeepSeek
DeepSeek-V4-Flash
DeepSeek-V4-Pro
Elixir
Erlang
GitHub
Go
Haskell
Java
JavaScript
Node.js
OCaml
Python
R
Rust
TypeScript
WebAssembly
Zig
Claim DeepSeek Harness and update features and information
Claim DeepSeek Harness and update features and information
Claim Extism and update features and information
Claim Extism and update features and information