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Show HN: Pinrail – A desktop inbox where coding agents wait for your review

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Pinrail is a desktop inbox that puts a human in the loop for agentic coding workflows: agents running locally (Claude Code, Codex, Cursor, OpenCode, or any program that can run a command) pause at designated steps and submit structured "reviews" to Pinrail. The app notifies you, groups reviews by project, and renders each review in a purpose-built view so you can accept, reject, edit, or annotate specific findings. Decisions are returned to the agent as Markdown or JSON so it can continue automatically; the CLI exit code signals whether the review was decided, discarded, withdrawn, or expired. Everything runs locally (loopback API) to keep data on your machine, and the project is in early development with macOS and Linux support and Windows coming.

The system is plugin-driven: core plugins include code-review (diffs with per-finding accept/reject), list, feedback (choices and text), markdown (section-by-section commenting) and image (select/generated-image review with boxes). Plugins are simple bundles (manifest, two JSON schemas, HTML view) and can be built with any web framework; a plugin SDK and sample-plugins repo provide a dev shell and Playwright tests. The repository contains a Rust core (API, storage, plugins), a Tauri+React UI, a CLI, SDK, skills, e2e tests, docs, and scripts; Node and Rust toolchains are pinned and common dev commands and CI checks are documented. Pinrail is open source under Apache 2.0.

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