Grok Build Subagents vs Agent Swarm: Which Parallelism?

By CodeAgentSwarm · Updated October 31, 2026

Grok Build can parallelize work in two ways people constantly mix up. Native subagents spawn inside one grok session. An agent swarm is several top-level grok processes (or mixed vendors) that a human supervises. Both are real. They are not the same product feature. Grok Build is xAI's coding CLI (grok), not the consumer Grok chat app.

Two parallelism models

Native subagents: one parent Grok Build session delegates to child sessions that have their own context and return a summary when they finish. Built-in types are general-purpose, explore (read and search only) and plan, and you can add your own in .grok/agents/. Children can ask for worktree isolation when the parent splits parallel work. Disable them with --no-subagents or GROK_SUBAGENTS=0.
Agent swarm: multiple independent terminals, each running grok (or Claude Code / Codex / …), supervised in tabs, tmux, or CodeAgentSwarm.

Subagents optimize for one operator conversation that fans out. Swarms optimize for human visibility across workers, multi-vendor mixes, and long-lived parallel tracks that do not share one context window.

How to choose

Choose subagents when the task is one story with parallel research or implementation legs Grok can coordinate. Choose a swarm when you need hard isolation, different models/vendors, or you personally want to steer each worker.

bash

# One session, no subagents
grok --no-subagents "keep this linear"

# One session in a worktree
grok --worktree=feat-auth "implement auth"

# Swarm: three CodeAgentSwarm terminals all set to Grok Build

Where CodeAgentSwarm sits

CodeAgentSwarm is the swarm layer. It does not replace Grok's subagents; it runs whole CLI sessions. You can still let one Grok terminal use subagents while another terminal runs a second Grok or Claude Code. That mix is the point.

FAQ

Should I disable Grok subagents when using CodeAgentSwarm?

Not by default. Subagents and multi-terminal swarms stack. Disable subagents only when you want a single linear worker.

Is a swarm just more subagents?

No. Subagents are owned by one session. Swarm terminals are independent processes with separate contexts.

Auto Kanban for AI Coding Agents: Tasks That Start on Their Own

A task board tells you what needs doing. Until now it could not do anything about it. You still had to open a session, pick an agent, paste the task and wait, one card at a time.

Read guide

View all guides