downspout

Build, test, and verify downspout plugins and core targets. Use when Codex needs to configure CMake, build a plugin or test target, run CTest/core tests, choose narrow verification for a change, or avoid known downspout build-directory races.

Compose, arrange, mix, save, and verify original music in a connected REAPER session through REAPER MCP. Use for requests to create songs, instrumentals, MIDI arrangements, plugin-based productions, or reusable DAW composition recipes, especially when Downspout VST3 instruments and effects are available.

Add a new downspout plugin end to end. Use when Codex is asked to scaffold or port a plugin under the plugins directory and must keep CMake, install, release packaging, docs, screenshots, and GitHub Pages catalog entries synchronized.

Extend or modify behavior in an existing downspout plugin. Use when Codex is asked to add controls, DSP or MIDI behavior, transport/state handling, serialization, UI elements, or tests inside a plugin directory while preserving the portable-core plus thin-DPF-wrapper architecture.

Maintain downspout release packaging, install scripts, GitHub Actions release assets, screenshots, and GitHub Pages plugin catalog metadata. Use when Codex changes plugin bundle lists, adds/removes public plugins, edits docs/pages products, or updates screenshot/release workflows.