What is Reasonix?

Reasonix is a deepseek-native terminal coding agent designed for persistent developer sessions.It uses an append-only, cache-first loop aligned with Deepseek’s byte-stable prefix cache to achieve 90%+ cache hits and reduce input-token billing to about one-fifth.

The tool is distributed as a single Go binary (cgo-free) cross-compiled for macOS, Linux, and Windows on amd64 and arm64, with no Node runtime required.I/O supports stdio, SSE, and streamable HTTP, and external servers can merge tools into a unified registry.

Plan mode and sandboxing provide jailed workspaces and read-only approval gates for controlled write operations.Subagents and skill scripts enable isolated workflows for exploration, research, review, and security-review tasks.

Terminal-native integration treats git diff and ls as workspace controls, maps codebases to keep the prefix cache warm, and lets sessions run continuously and resume without cold starts.The project is MIT-licensed and requires a Deepseek API key; code and model interactions remain local to the machine.

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Reasonix's key features

Terminal-native persistent coding agent with continuous sessions and resume capability
Append-only, cache-first loop aligned with Deepseek byte-stable prefix cache
Single cgo-free Go binary cross-compiled for macOS, Linux, and Windows on amd64 and arm64 (no Node runtime)
I/O via stdio, SSE, and streamable HTTP with external servers able to merge tools into a unified registry
Plan mode and sandboxing providing jailed workspaces and read-only approval gates for controlled write operations

Reasonix use cases

Maintain persistent developer sessions to iteratively refactor and test large codebases in sandboxed workspaces using Reasonix's append-only, byte-stable prefix cache (90%+ cache hits) to slash input-token billing to about one-fifth while enabling fast local-model-driven code transforms
Run isolated subagent workflows for automated CI tasks—linting, security scans, test generation, and pull-request drafting—using Reasonix's single-binary distribution and sandboxing so engineers can self-host reproducible automation with minimal overhead
Enable rapid onboarding and collaborative debugging by sharing persistent terminal sessions and cache-first context so new team members and reviewers can instantly pick up state, interact with local models for explanations and fixes, and avoid re-sending full context