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PrimeIntellect-ai/prime-agent

An open-source coding and research agent built on a persistent Python REPL, with subagents, a self-refining harness, and support for long-running tasks.

Open-source alternative to:Claude CodeDevin

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What is it?

Prime Agent is an open-source coding and research agent for general and long-running work. Its built-in model tool is a persistent Python REPL, so file operations, shell commands, tool calls, subagents, and context management all run as code. Child agents can be spawned with rlm.spawn(...) for parallel or background work and return their results programmatically.

The project is built around two ideas: a Recursive Language Model approach that treats context as variables and tools as function calls, and a Continual Harness that stores supplemental prompts, memories, skill descriptions, and reusable subagent specifications as durable state. The /refine command reviews the current trajectory and applies small, evidence-backed updates to that state, with snapshots that support rollback. The immutable base system prompt is never rewritten.

Sessions can run as daemon-backed background agents that survive terminal disconnects and can be reattached later. Features such as persistent goals, heartbeats, schedules, and bounded autonomous mode support long tasks, and an optional Slack connector is available through MCP.

Key features

  • 01Persistent Python REPL as the main tool for files, shell, and subagents
  • 02Built-in subagents via rlm.spawn for parallel or background work
  • 03/refine updates supplemental harness state with snapshots for rollback
  • 04Daemon-backed sessions that keep running after the terminal disconnects
  • 05Persistent goals, heartbeats, schedules, and bounded autonomous mode
  • 06Executable skills packaged as importable Python modules

Use cases

  • Running long coding tasks that continue across terminal sessions
  • Parallelizing research or evaluation work across child agents
  • Turning recurring workflows into reusable project or personal skills
  • Running scheduled or periodic checks on an ongoing project

Quick start

  1. 1

    Install the latest stable version

    curl -fsSL https://app.primeintellect.ai/prime-agent/install.sh | sh
  2. 2

    Start Prime Agent in your project directory

    cd /path/to/project prime-agent
  3. 3

    Run /login inside Prime Agent to choose a subscription or API-key provider

Things to know

  • Prime Agent runs model-generated Python and project commands with your user permissions and is not a security sandbox.
  • You need a subscription or API key from a supported provider to use it.

Topics

#ai-agent#coding-agent#llm#python-repl#subagents#rust#autonomous-agent#developer-tools

FAQ

What is prime-agent?
An open-source coding and research agent built on a persistent Python REPL, with subagents, a self-refining harness, and support for long-running tasks. Prime Agent is an open-source coding and research agent for general and long-running work. Its built-in model tool is a persistent Python REPL, so file operations, shell commands, tool calls, subagents, and context management all run as code. Child agents can be spawned with rlm.spawn(...) for parallel or background work and return their results programmatically.
Is prime-agent free to use? What license does it have?
prime-agent is open source under the Other license. Check the license terms before using it in commercial products.
Is prime-agent still maintained?
Actively maintained. The last commit to prime-agent was on Oct 19, 2026.
What can I use prime-agent for?
Running long coding tasks that continue across terminal sessions Parallelizing research or evaluation work across child agents Turning recurring workflows into reusable project or personal skills Running scheduled or periodic checks on an ongoing project
How do I install prime-agent?
Install the latest stable version: curl -fsSL https://app.primeintellect.ai/prime-agent/install.sh | sh Start Prime Agent in your project directory: cd /path/to/project prime-agent Run /login inside Prime Agent to choose a subscription or API-key provider
Where can I get prime-agent?
The source code and installation instructions are on GitHub: https://github.com/PrimeIntellect-ai/prime-agent

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