<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Medium Risk**
> Touches authentication/login flow, credentials-file permissions, and
subprocess lifecycle behavior across platforms; while mostly defensive,
regressions could impact login or process management on Windows/macOS
runners.
>
> **Overview**
> Improves Windows/cross-platform reliability across the CLI and MCP
server: OAuth login now binds the callback server to `127.0.0.1`, avoids
slow loopback reverse-DNS, adds a configurable callback timeout
(`--timeout` + env default), and opens URLs via a Windows-friendly
`_open_browser` to avoid flashing console windows.
>
> Centralizes CLI output via a shared `console` that forces UTF-8 on
Windows, standardizes UTF-8 file reads/writes throughout, tightens
credentials-file permissions on Windows using `icacls`, and adds shared
Windows subprocess helpers for **no-window** process creation and
graceful termination (used by `deploy`, MCP reload, and usage-tracking
worker).
>
> Updates client configuration UX/robustness (Windows AppData resolution
via `platformdirs`, Cursor config path fallbacks + compatibility writes,
overwrite warnings, absolute `uv` path for GUI clients, safer path
display) and improves `deploy` child-process handling to avoid
pipe-buffer deadlocks while giving better debug-aware error messages.
>
> Expands CI to run tests on Linux/Windows/macOS, adds a no-auth CLI
integration workflow, disables usage tracking in toolkits CI, and adds
extensive regression tests for Windows signals, subprocess cleanup,
UTF-8, and config-path edge cases; bumps `arcade-core` to `4.4.2` and
`arcade-mcp-server` to `1.17.2` (with updated dependency pin).
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
0fabd8ca1cd647039ba6ddbdf3f7809c330bab9e. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
### Overview
Major restructuring from monolithic `arcade-ai` package to modular
library architecture with standardized uv-based dependency management.
### New Package Structure
- **`arcade-tdk`** - Lightweight toolkit development kit (core
decorators, auth)
- **`arcade-core`** - Core execution engine and catalog functionality
- **`arcade-serve`** - FastAPI/MCP server components
- **`arcade-ai`** - Meta package that includes CLI functionality.
Optionally include evals via the `evals` extra. Optionally include all
packages via the `all` extra.
### Key Benefits
- **Lighter Dependencies**: Toolkits now depend only on `arcade-tdk` (~2
deps) vs full `arcade-ai` (~30+ deps)
- **Faster Builds**: uv provides 10-100x faster dependency resolution
and installation
- **Better Modularity**: Clear separation of concerns, consumers import
only what they need
- **Standard Tooling**: Eliminates custom poetry scripts, uses standard
Python packaging
### Migration Impact
- All 20 toolkits converted from poetry → uv with `arcade-tdk`
dependencies plus `arcade-ai[evals]` and `arcade-serve` dev
dependencies. When developing locally, devs should install toolkits via
`make install-local`.
- Modern Python 3.10+ type hints throughout
- Standardized build system with hatchling backend
- Enhanced Makefile with robust toolkit management commands
- Removed `arcade dev` CLI command
- Reduce the number of files created by `arcade new` and add an option
to not generate a tests and evals folder.
This foundation enables faster development cycles and cleaner dependency
chains for the growing toolkit ecosystem.
### Todo After this PR is merged
- [ ] Post-merge workflow(s) (release & publish containers, etc)
- [ ] Release order plan. @EricGustin suggests releasing in the
following order:
1. `arcade-core` version 0.1.0
2. `arcade-serve` version 0.1.0 and `arcade-tdk` version 0.1.0
3. `arcade-ai` version 2.0.0
4. Patch release for all toolkits (all changes in toolkits are internal
refactors)
- [ ] [Update docs](https://github.com/ArcadeAI/docs/pull/318)
---------
Co-authored-by: Eric Gustin <eric@arcade.dev>
Co-authored-by: Eric Gustin <34000337+EricGustin@users.noreply.github.com>
