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Show HN: Paneflow – cross-platform GPUI app for parallel coding agents

Developer ArthurDEV44 released Paneflow, an open-source native GPUI workspace for running multiple coding agents in parallel terminal panes. Built in Rust on Zed's GPUI framework, the tool supports Claude Code, Codex, Gemini, and other CLI agents with live status tracking and cross-platform builds for Linux, macOS, and Windows. Paneflow aims to solve coordination and observability problems when supervising multiple AI coding agents simultaneously.

read7 min views1 publishedJun 30, 2026
Show HN: Paneflow – cross-platform GPUI app for parallel coding agents
Image: source

A native GPUI workspace for running coding agents in parallel.

Paneflow keeps Claude Code, Codex, Gemini, opencode, and any CLI agent in real terminal panes you can see, interrupt, and take over. It tracks which agent is thinking, waiting, stalled, failed, or done; keeps each task tied to its workspace and branch; and gives agents a local control plane when you want them to coordinate instead of work blind.

It is open source, written in Rust on Zed's GPUI, and ships native builds for Linux, macOS Apple Silicon, and Windows x64. No Electron. No WSL required. No hosted agent runtime.

Install · Why Paneflow · Core workflows · Safety model · Docs · FAQ

Several coding agents running in parallel panes, with live status for who is thinking, running, waiting, or done.

Release builds are attached to the latest GitHub release. You do not need Rust unless you are building from source. Asset filenames use the version without the leading v

from the Git tag (paneflow-0.7.2-x86_64.AppImage

, not paneflow-v0.7.2-...

).

Platform Recommended path Status
Linux x86_64 / aarch64 AppImage, .deb , .rpm , or .tar.gz
Active: Wayland and X11
macOS Apple Silicon Signed and notarized .dmg
Active
macOS Intel Not shipped today Planned to return when the release matrix reopens it
Windows x64 Signed .msi
Active: Windows 10 1809+ and Windows 11
Windows ARM64 Not shipped today Deferred pending GPUI DX11 ARM64 reliability
VER=$(curl -fsSL https://api.github.com/repos/ArthurDEV44/paneflow/releases/latest \
      | grep -oE '"tag_name":\s*"v[^"]+"' | cut -d\" -f4 | sed 's/^v//')
ARCH=$(uname -m)
curl -LO "https://github.com/ArthurDEV44/paneflow/releases/latest/download/paneflow-${VER}-${ARCH}.AppImage"
chmod +x "paneflow-${VER}-${ARCH}.AppImage"
./paneflow-${VER}-${ARCH}.AppImage

On Ubuntu 24.04+ or immutable distros, run the AppImage with --appimage-extract-and-run

if FUSE 2 is unavailable. .deb

, .rpm

, .tar.gz

, SHA-256 sidecars, and Minisign signatures are published with each release.

Download paneflow-X.Y.Z-aarch64-apple-darwin.dmg

from the latest release, open it, and drag PaneFlow.app

into /Applications

.

A Homebrew tap is available:

brew tap arthurdev44/paneflow
brew install --cask paneflow

If the cask lags a fresh release, use the DMG directly.

Download paneflow-X.Y.Z-x86_64-pc-windows-msvc.msi

from the latest release and double-click it. The MSI is signed; verify it with:

signtool verify /pa /v paneflow-X.Y.Z-x86_64-pc-windows-msvc.msi

See docs/WINDOWS.md for the supported Windows matrix and known platform caveats.

Starting coding agents is easy. Keeping a reliable view of ten running sessions is the hard part: which one is waiting on you, which branch it touched, which test output belongs to which task, and how to hand context from one agent to another without copy-pasting terminal scrollback.

Paneflow is built around that coordination problem:

  • Real terminal panes for every agent, so nothing is hidden behind a chat-only abstraction.
  • Live agent state from hooks and IPC, not a vague "terminal is active" heuristic.
  • Workspaces and git branches visible in the app chrome.
  • A review surface for comparing worktree diffs side by side.
  • A read-only MCP bridge so one agent can inspect another pane's output.
  • A local CLI and JSON-RPC control plane for scripted orchestration.

The goal is not to replace your editor or your shell. It is to make parallel agent work observable enough that you can supervise it without losing context.

Launch Claude Code, Codex, Gemini, opencode, Pi, Hermes, or any CLI agent in a real PTY pane. Paneflow keeps the raw terminal visible while adding the app-level state you need for multi-agent work: workspace, branch, title, status, notifications, and session restore.

The sidebar, tab dots, desktop notifications, Attention Queue, and Rosetta surface turn scattered agent events into a readable queue: waiting for input, running, stalled, errored, or recently finished. Rosetta is the in-app status surface for agent notifications and can stay quiet unless something needs your attention.

The paneflow

CLI talks to the same local socket as the app:

paneflow ps
paneflow read cargo-run --lines 100
paneflow watch --json
paneflow send codex-review "Review this branch and report risks"
paneflow wait --surface claude-impl --pattern "REPORT_DONE"
paneflow flow run examples/review-pipeline.flow.toml

paneflow up

can spawn declarative workspaces, and paneflow flow run

executes a flow.toml

DAG with spawn, wait, send, capture, and review steps. By default Paneflow pre-fills prompts and a human presses Enter. Auto-submit is explicit and gated.

paneflow mcp install

registers a local read-only MCP bridge for supported CLI agents. It exposes:

list_panes

read_pane

search_pane

The bridge cannot type into panes or control them. Returned terminal output is wrapped as untrusted data so downstream agents know to analyze it, not obey it. The tool manifests live in mcps/paneflow/tools.

When each agent works in its own branch or worktree, Paneflow can show the resulting diffs side by side: one column per worktree, with hunk navigation, branch review prompts, attribution, and local cost estimates where token usage is available.

Area What Paneflow gives you
Terminal workspace Splits, tabs, resize, layout presets, session restore, markdown panes
Agent state Thinking, waiting, finished, errored, stalled, notifications, Rosetta
Review Worktree diff columns, hunk navigation, review prompts, cost estimate
Automation CLI, JSON-RPC socket, paneflow up , paneflow flow run , event stream
Agent context Read-only MCP bridge with list_panes , read_pane , search_pane
Native runtime Rust, GPUI, alacritty_terminal , Vulkan / Metal / DirectX
Trust GPL-3.0-or-later, signed release artifacts, opt-in telemetry

Paneflow is intentionally local-first.

  • Agents run as normal CLI processes inside normal PTYs.
  • The UI is a supervisor surface, not a hosted agent runtime.
  • Prompt prefill is the default; auto-submit is opt-in.
  • IPC writes are gated behind explicit scripting access.
  • MCP tools are read-only.
  • Terminal output returned to agents is marked as untrusted.
  • Telemetry is opt-in and can be disabled unconditionally with PANEFLOW_NO_TELEMETRY=1

. - Release artifacts ship with checksums and detached Minisign signatures.

Paneflow pins Rust 1.95 through rust-toolchain.toml.

git clone https://github.com/ArthurDEV44/paneflow.git
cd paneflow
cargo build --release -p paneflow-app
cargo run -p paneflow-app

Useful development checks:

cargo fmt --check
cargo test --workspace
cargo clippy --workspace -- -D warnings

Linux builds need Vulkan and the usual Wayland/X11 development libraries. macOS and Windows packaging have extra signing and bundling steps documented in the release runbooks.

paneflow.dev- product site and public docsARCHITECTURE.md- runtime architecture and thread modeldocs/mcp-bridge.md- MCP bridge behavior and installdocs/WINDOWS.md- Windows support matrix and caveatsdocs/release/linux-signing.md- Linux release verificationdocs/release/macos-signing.md- macOS signing and notarizationdocs/release/windows-signing.md- Windows MSI signingAGENTS.md- repository instructions for coding agentsllms.txt- compact map for AI agents and crawlers

Tool family Strength Paneflow difference
tmux / terminal tabs Universal shell multiplexing Paneflow adds agent state, workspaces, review, sidebars, and MCP
WezTerm / iTerm2 / Ghostty Great terminals Paneflow focuses on supervising several agent sessions in one project window
Warp-style AI terminals Polished single-terminal AI workflows Paneflow keeps existing CLI agents visible in raw PTY panes
cmux-style agent workspaces Multi-agent coordination Paneflow is independent Rust/GPUI, cross-platform, and local-first

Detailed comparisons live at paneflow.dev/compare.

Why not tmux with one agent per pane? Use tmux if you mostly work over SSH or want a headless multiplexer. Paneflow is for local GUI supervision: agent state, notifications, MCP pane reads, worktree review, and a native control plane around real terminals.

Is this another Electron app? No. Paneflow is Rust on GPUI with Vulkan on Linux, Metal on macOS, and DirectX on Windows.

Does Paneflow drive agents for me? Only when you explicitly enable that flow. The default is visible terminal control: prompts are pre-filled, you review them, then you press Enter.

Can agents read sensitive terminal output? Only agents you configure through the MCP bridge can read pane output, and the bridge is read-only. Treat that as powerful local context access: useful for coordination, but still something to enable intentionally.

Does it phone home? Not unless you opt in. Telemetry never includes terminal contents, paths, or prompts, and PANEFLOW_NO_TELEMETRY=1

disables it regardless of config.

What about Windows? Windows x64 is a first-class release target. Windows ARM64 is not shipped yet. See docs/WINDOWS.md for the support matrix and known issues.

Why GPL-3.0-or-later? Paneflow is meant to stay open. GPL keeps improvements to the app in the commons while allowing normal internal and commercial use.

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