Reasonix: Trustworthy Coding Autonomy

Overview

This series explains how Reasonix turns model judgment into bounded coding work. It begins with the provider–host–user responsibility split, follows a tool call through validation, target resolution, permission, Sandbox enforcement, execution, and evidence, then separates Plan, Goal, context, memory, receipts, rewind, session branches, workspace leases, MCP, extensions, delegation, ACP, and Remote SSH. The organizing principle is that autonomy is trustworthy only when authority, effects, state, ownership, and recovery remain visible. Reasonix can automate substantial work inside an explicit, observable, recoverable scope, but the series does not support universal safety, faster delegation, or model completion as proof of correct code.

Learning outcomes

Reasonix separates model intent from host admission, tool effects, and observed facts.
Plan controls when implementation begins; Goal controls continuation, not permission.
Memory and context projections aid continuity without replacing exact session history.
Rewind restores structured edits, while opaque external effects remain outside universal undo.
MCP, extensions, delegation, ACP, and Remote SSH add distinct trust and ownership boundaries.

Keywords

ReasonixAutonomyExecutionPermissionsSandboxEvidenceRewindMCPDelegationSessions

Chapters

Reasonix: Model or Host?

The boundary between model judgment and host control

9 min · The boundary between model judgment and host control

9 min

Reasonix: From Prompt to Tool Call

Validation before permission and execution

9 min · Validation before permission and execution

9 min

Reasonix Control Plane

How Plan, Goal, permissions, and Sandbox differ

9 min · How Plan, Goal, permissions, and Sandbox differ

9 min

Reasonix: What a Turn Proves

Tracking intent, admission, effect, and evidence

9 min · Tracking intent, admission, effect, and evidence

9 min

Reasonix: Context Without False Memory

How instructions, memory, history, and evidence stay distinct

11 min · How instructions, memory, history, and evidence stay distinct

11 min

Reasonix: Rewind Without Universal Undo

Sessions, worktrees, leases, and preserved conflicts

11 min · Sessions, worktrees, leases, and preserved conflicts

11 min

Reasonix: External Trust Boundaries

How MCP, extensions, delegation, and Remote SSH differ

12 min · How MCP, extensions, delegation, and Remote SSH differ

12 min

Reasonix: What Can It Safely Automate?

Scope, evidence, recovery, and limits of trust

11 min · Scope, evidence, recovery, and limits of trust

11 min

Preview every chapter · Unlock full text, audio, and video from chapter 4

Plans

Ch.1-3 FreeCh.4-8 Premium

FAQ

What makes Reasonix different from a model in a chat window?

Reasonix is a host around a model: it registers tools, validates calls, applies permission and Sandbox checks, records outcomes, and feeds bounded evidence into later turns.

How do Plan, Goal, permissions, and Sandbox differ in Reasonix?

Plan gates state-changing work until approval, Goal continues a saved objective across turns, permissions decide whether a concrete call may run, and the Sandbox limits where an allowed call can operate.

Can Reasonix safely automate a long coding task?

Reasonix can automate substantial work when the objective, scope, approval posture, evidence expectations, and recovery path are explicit and enforceable. It cannot make opaque external effects reversible or treat a model's completion report as proof that the code is correct.

Are MCP servers and Reasonix extensions sandboxed?

An MCP server is trusted through installation and remains outside the local file Sandbox; a code extension is explicitly full trust and can bypass workspace and permission restrictions. Their protocols and metadata improve visibility but do not remove those trust boundaries.