Agent IDEs & coding harnesses

Amazon's developer-focused agent — formerly CodeWhisperer (renamed 2024-Q4). Available as IDE plugins (VS Code, JetBrains, Visual Studio, Eclipse), in AWS Console, and CLI. Strong AWS-tooling integration: Q can read CloudWatch, troublesh…

Anthropic's API-surface capability that lets Claude control a virtual desktop — see screenshots, type, click. Launched 2024-10 as a public beta. Not a finished IDE itself; it's the substrate that other harnesses (and Anthropic's own Clau…

Cross-listing of Bolt.new at the harness layer. StackBlitz's WebContainer technology runs full Node.js in-browser; Bolt prompts the user for an app spec, then writes/edits/runs/deploys it entirely in-browser. The Coding-agent-memory row …

OpenAI's cloud-hosted, asynchronous coding agent surfaced inside ChatGPT — distinct from Codex CLI (terminal) and from the deprecated 2021 Codex API. Released 2025-05. Reads + writes from sandboxed cloud environments; integrates with Git…

Anthropic's official agentic coding CLI — runs Claude as a long-running coding agent in the developer's terminal. Memory layer = CLAUDE.md (project + user scoped), agent skills, MCP servers. Released GA October 2024; widely adopted as th…

Cross-listing of Cognition's Devin product framed at the harness level rather than the memory layer. Devin 2.0 (Mar 2025) added cheaper concurrent sessions; Spec Mode (Aug 2025, post-Windsurf-IP acquisition) integrates Windsurf-style spe…

AI-first IDE that forked VS Code; Composer (multi-file edit) and Agent Mode (long-running coding agent) are its flagship surfaces. Memory layer = .cursorrules / Rules; recall via repo-aware Context Engine. Anysphere (parent) raised $900M…

The original AI coding assistant (Copilot in editor; 2021). 2025 evolved into a full agentic surface: chat, completions, Agent Mode (multi-step), and Copilot Workspace. Backed by Microsoft. Distinct row from Workspace — this row covers t…

GitHub's hosted agentic workspace — given an issue, generates a spec, plan, and PR. Preview launched April 2024; rebranded "GitHub Copilot Coding Agent" + "Copilot Agent Mode" in 2025 with broader GA. Backed by Microsoft Azure OpenAI + A…

JetBrains' in-IDE assistant integrated across IntelliJ, PyCharm, GoLand, WebStorm, Rider, etc. Multi-model: OpenAI, Anthropic, Google, local. Differentiated by its deep IDE-API integration — refactorings, run configs, debugger context.

Spec-driven agentic IDE from AWS — preview launch July 2025. Codifies the AI-coding workflow as Requirements / Design / Tasks files generated before code ("specs"); also persists "steering" files and Hooks. Built as a VS Code fork; runs …

Cross-listing of Lovable at the harness layer. Swedish startup (Stockholm) that grew out of GPT Engineer (Anton Osika). Builds full-stack React/Supabase apps from prompts; AI handles git, deploys, DB. The Coding-agent-memory row remains …

OpenAI's open-source terminal coding agent — released April 2025 alongside o3/o4-mini. Counterpart to Claude Code in the OpenAI stack. Memory via ~/.codex/memories (file-backed); routes to OpenAI o-series and Codex (model) for execution.…

Cross-listing of OpenHands at the harness layer. OSS Devin-alternative — sandboxed full SWE agent with browser + shell + editor. Renamed from OpenDevin Mar 2024. ~40k★. Commercial offering: All Hands AI cloud (managed SaaS).

Cross-listing of Replit Agent at the harness layer. Replit Agent v3 (2025) added background agents + agent-driven deploy. The Coding-agent-memory row remains canonical for the memory framing.

Sourcegraph's coding assistant — IDE plugin (VS Code, JetBrains) plus web. Distinguishes itself with Sourcegraph's code-search index as the context provider (cross-repo, codebase-wide retrieval). Agentic chat added 2024; runs Claude / GP…

Vercel's AI product (formerly v0.dev) that generates React/Next.js components and full apps from natural-language prompts. Tight integration with Vercel deploy; uses Vercel-hosted models (multi-LLM). Differentiator: best-in-class shadcn/…

Codeium-built agentic IDE (VS Code fork); flagship was Cascade — a planning + execution agent that maintains "Flows" and "Memories" as durable artifacts. Reported acquired by OpenAI in May 2025 for ~$3B (later partly unwound — Google pai…

Native (Rust) collaborative code editor by Zed Industries (founded by the Atom + Tree-sitter team). Added Agentic Editing in 2024 — multi-step coding agent driven by Claude or local models; .rules markdown + Threads form the memory layer…

OSS terminal coding agent by Paul Gauthier — one of the original AI-pair-programmer CLIs (2023). Architect/Editor modes; repo-map for context; uses any LiteLLM-compatible model. Memory via CONVENTIONS.md and .aider.conf.yml — author-edit…

AWS Bedrock AgentCore — managed runtime to deploy + scale + observe agents. Multi-component: Runtime, Identity, Memory, Gateway, Browser, Code Interpreter, Observability. Distinct from Bedrock Agents (older fixed-config product); AgentCo…

OSS VS Code extension that runs as a fully agentic coding assistant — plan/act modes, file ops, shell exec, browser-use, MCP. Originally "Claude Dev" (2024); rebranded Cline 2024-Q4. Multi-model: Anthropic, OpenAI, OpenRouter, Bedrock, V…

OSS in-IDE coding-assistant plugin — supports VS Code and JetBrains. Customisable: any model, any context provider, any slash-command. "Agent mode" added 2024 for multi-step plan + execute. Memory layer = .continue/rules; separate Memory…

Block (Square)'s open-source on-machine agent — terminal + desktop GUI. Modular: extensions for shell, computer-control, MCP servers; multi-model via LiteLLM. Released 2024; positioned as a general-purpose local agent, not coding-only. G…

JetBrains' answer to Cursor Agent Mode / Devin — an autonomous in-IDE coding agent. Public beta 2024-Q4; runs alongside AI Assistant inside IntelliJ-platform IDEs. Plans, edits, runs tests; multi-model.

AI-coding startup focused on extremely long-context models (claimed 100M tokens) and a frontier coding agent. Raised $320M Series B from Eric Schmidt, CapitalG, Atlassian Aug 2024. Lower public-product surface than peers — mostly known f…

Chinese-origin general-purpose autonomous agent launched March 2025 by Butterfly Effect. Operates in a cloud sandbox — browser, file system, shell. Went viral on launch with invite-only access; positioned as a Devin/AutoGPT competitor fo…

Cross-listing of MetaGPT as a harness. Multi-agent OSS framework that simulates a software company — PM, architect, engineer, QA. Generates docs + code + tests from a one-line prompt. ~44k★. Distinct from "Agent frameworks (no first-part…

SST team's open-source terminal coding agent — TypeScript, multi-model, MCP-native. Released 2025; explicitly positioned as a permissively-licensed Claude Code alternative. Memory via AGENTS.md (the emerging cross-harness convention).

Charm Bracelet's terminal-native AI coding assistant — built in Go atop the Bubble Tea TUI framework. Multi-model via Glamour/Mods integration. Open-sourced 2025; positioned as a TUI-native alternative to web/Electron harnesses for devel…

OSS VS Code agentic extension — Cline fork that diverged with custom modes (Architect, Code, Ask, Debug). Memory via .roorules + Memory Bank. Smaller community than Cline but persistent contributor base.

Early (2023) OSS coding agent by Swyx — minimalist single-prompt-to-codebase loop. ~12k★. More artifact-than-product now (subsumed by Cline / Aider / Claude Code) but historically significant — defined the "smol" school of single-file co…