Spool MCP server

Spool

思簿 — a context hub for long-running projects.

Logo: a spool viewed from above, its thread pulling free — watch it assemble.

spoolapp.org · Download for macOS · Download for Windows The site walks the whole loop in an interactive demo (English / 中文) — no install needed. macOS: a signed, Apple-notarized .dmg. Windows: an x64 installer, not code-signed yet. Free, offline, no account.

At the moment you naturally produce a fragment of information — a good answer from an AI, a decision buried in an email, a link to a document, a half-formed thought — Spool lets you capture that fragment effortlessly, files fragments under a two-tier Workspace → Project structure, and packs any project into a paste-ready briefing on demand — so you can re-enter a project, or re-brief an AI, instantly.

Why it exists

LLMs do not remember your project. Every new conversation, you re-explain the context. Across multiple AIs, multiple tabs, multiple emails, spanning many days, a project's context gets shredded — and reassembling it falls on your memory.

Spool compresses "re-explaining" into "a single paste."

The core loop

Capture  ──▶  Project ──▶  Pack  ──▶  (paste, re-enter)
      ▲                                       │
      └───────────── days later ──────────────┘

• Capture — double-tap a modifier key (⌥ on macOS, Ctrl on Windows) and whatever is on your clipboard is written into the current project. Rides existing ⌘C / Ctrl+C muscle memory. No decisions at capture time. The confirmation overlay opens with the cursor already in a note box — type the thought that made you save this and press Enter, or click anywhere to skip. Your own note outlives the excerpt, and connected AIs treat it as the highest-signal line. The main window never has to come forward.
• Project — an append-only timeline of fragments. Two tiers only: Workspace (big topic) → Project (one piece of work). No infinite nesting. On open the feed lands at the newest blocks — they ARE "where you left off," no manual status note to maintain.
• Pack — one click assembles a paste-ready Markdown briefing of the project. Pure string assembly, no AI in the hot path, fully deterministic.

Status

v0.5.0 — feature-complete and shipping on macOS and Windows. The two builds run the same library, the same pack, and the same capture gesture: a double-tap of one modifier key, ⌥ on macOS and Ctrl on Windows. What did not cross over is the macOS-specific work around focus handling and browser tab-title capture, so a Windows capture records the source application rather than the page. Linux is not implemented.

• Distribution — macOS: Developer ID–signed, Apple-notarized .dmg, straight from Releases. Not on the Mac App Store — sandboxing conflicts structurally with the global capture trigger.
• Distribution — Windows: an x64 NSIS installer built by CI, not code-signed in this first release, so SmartScreen warns once before it will install.
• Website: spoolapp.org, with an interactive walkthrough of capture → pack → re-brief → MCP in English and Chinese.
• No auto-update channel yet: direct distribution means new versions are a manual download.

New in v0.5.0

Shortened. The full README is on GitHub.