Coding agent · CLI / RLM Harness

Prime Agent

Verified Aug 2026

Quick answer: Long-running coding/research loops where you want an open MIT RLM harness — persistent IPython, recursive subagents, and a Continual Harness that can `/refine` itself — with subscription or BYOK/self-hosted models.

Best for

Long-running coding/research loops where you want an open MIT RLM harness — persistent IPython, recursive subagents, and a Continual Harness that can `/refine` itself — with subscription or BYOK/self-hosted models.

Skip if

You want a polished GUI IDE, refuse running model-generated Python with your user permissions, or need the simplest Claude Code–class daily CLI.

Who it fits

  • Long-running coding/research loops where you want an open MIT RLM harness — persistent IPython, recursive subagents, and a Continual Harness that can `/refine` itself — with subscription or BYOK/self-hosted models.
  • Terminal-first engineers who live in the shell and git
Experimental

Pros

MIT open-source self-improving harness (Prime Intellect) built on Recursive Language Model + Continual Harness — persistent IPython as the model tool, `rlm(...)` subagents, `/refine` evidence-backed harness updates with rollback, daemon detach/reattach, goals/heartbeats/schedules, executable Python skills; subscriptions + multi-provider BYOK including self-hosted; TUI forked from pi.

Cons

Young public release (Aug 2026); IPython-centric trust model — model-generated Python/commands run with your user permissions (not a security sandbox); research/eval-shaped surface vs polished daily IDE agents; ARC-AGI-style claims are harness+model dependent.

Facts

Locality:
Hybrid (local + cloud)
Surfaces:
CLI
Maturity:
Experimental
BYOK:
Bring your own API key
Open source:
Source available
Free tier:
Free option available
Verified:
Aug 2026

Agent standards & memory

AGENTS.md: SupportedSKILL.md: SupportedRules / memory: Continual Harness supplemental prompts/memories/skills/subagent specs; session + IPython state; /refine snapshots.100% Free (Open-source, MIT); model cost via subscription login or BYOK / self-hosted.

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