Reasonix

Reasonix is an open-source AI coding agent that performs complex software engineering tasks with plan mode, gated tools, and non-git checkpoints.

Reasonix is an open-source coding agent designed for complex software engineering tasks. It runs locally as a single CGO-free Go binary without runtime dependencies, sending code directly to a user-provided DeepSeek API key. The agent emphasizes auditability through a plan mode that halts writes until approved, tool gating for reads, writes, and shell commands, and a workspace sandbox. Non-git checkpoints are created each turn so long autonomous sessions can be undone without affecting commit history. Users can interact via a desktop application, terminal TUI, local web interface, or ACP-compatible editors such as VS Code.

Reasonix at a glance

Best for: Software engineer
Runs on: macOS, Windows, Linux, Web, CLI, VS Code, open source
Pricing: Free
Released: April 2026
Category: AI coding tool
Website: reasonix.io

Key features

Plan mode to hold writes until approved
Gated tool permissions for reads, writes, and shell commands
Workspace sandbox to restrict command execution
Per-turn non-git checkpoints to undo runs without changing history
External tool integration via MCP over stdio, SSE, and streamable HTTP
Markdown skills and subagents for explore, research, and review tasks
Single CGO-free Go binary with cross-compilation
Codebase mapping retained across the session

Use it for

Executing multi-hour autonomous coding tasks with turn-by-turn rewind capability
Auditing and reviewing code diffs before applying tool actions
Extending development workflows using MCP servers and isolated subagents
Running automated security reviews and code research via subagent tool sets

Companions

Tools that articles about Reasonix recommend using with it, each with its job.

Context7 — Provides up-to-date documentation for AI agents and code editors.
Ollama — Run local models at zero marginal cost, with code kept on your machine.
OpenRouter — Access over 500 models and 80 providers through one unified API.
Daytona — Runs sessions in isolated sandboxes synced to git branches.
Composio — Equips AI agents with tools, managed user auth, and sandboxes across 1,500+ apps
Oh My OpenCode Slim — Lightweight multi-agent orchestration and background tasks.

Alternatives to Reasonix

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Coucou — It provides open-source, real-time agent monitoring and approvals directly from the screen notch.
OpenCode — Works with 75+ model providers, local models, and existing subscriptions
jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
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Dirac — Executes complex coding tasks efficiently with hash-anchored edits and low token overhead.
GoCodeo — Generates production-ready code, explains code, and creates tests in seconds.
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OpenClaude — Connects one terminal interface to over 200 different AI models.
Oracle — Provides a single entry point for multiple pro AI agents and session management.
16x Prompt — Manage code context and compare multiple LLM responses side-by-side easily.

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