Sago

Sago: The project planner for AI coding agents

You describe the project in markdown. Sago generates and maintains the plan. Your coding agent (Claude Code, Codex, Cursor, Aider, etc.) builds it.

  

What sago does

Sago is a **planning and control-plane tool**, not a coding agent. It turns your project idea into a structured, verified plan, tracks progress across phases, and then gets out of the way so a real coding agent can do the building.

You → sago init → sago plan → coding agent builds Phase 1 → sago replan → coding agent builds Phase 2 → ...

**Why?** AI coding agents (Claude Code, Codex, Cursor, etc.) are excellent at writing code but bad at planning entire projects from scratch. They lose track of requirements, skip steps, and produce inconsistent architectures. Sago owns the spec, plan, and phase gates so the coding agent can focus on writing code.

Sago does not execute project tasks itself. The intended workflow is:

• Sago defines the work (PROJECT.md, REQUIREMENTS.md, PLAN.md)
• Sago reads repo-local agent context (IMPORTANT.md, AGENTS.md, SKILLS.md, CLAUDE.md, .cursorrules) when present
• Your coding agent executes the work
• Sago records state, reviews completed phases, and updates the plan

Table of contents

• Quick start
• How it works
• Using with Claude Code
• Using with other agents
• Mission control
• Trace Events
• Commands
• [C