v0.17.0

In short

• New: a Claude Code plugin. Add this repository as a plugin marketplace (claude plugin marketplace add commonpost/thunderbird-mcp, or "Add marketplace" in Customize > Plugins of your Claude account) and install
  commonpost-mcp: the plugin carries the bridge of the release, so there is no mcp-bridge.cjs to download or to
  replace by hand, and updating the plugin updates the bridge. It works in Claude Code and Cowork; the chat of
  Claude Desktop still needs the .mcpb bundle.
• The bridge does not change in this release: nothing to update in your MCP clients if their bridge is 0.14.0. A
  bridge 0.13 keeps working; updating it is optional.
• No call that worked stops working. Updating is not urgent.

How to update

• Thunderbird add-on: it updates itself. To get this version now: Add-ons and Themes, gear menu, Check for Updates, then restart Thunderbird. For a first installation, see the README (commonpost-mcp-v0.17.0.xpi below).
• MCP bridge: it is installed in your MCP client and is never updated automatically. This release ships the same bridge as v0.14.0: a bridge of version 0.14.0 needs no update.
  • Claude Desktop: download commonpost-mcp-v0.14.0.mcpb below and open it with Claude Desktop; if the file does not open there (Windows), use Settings > Extensions > Advanced settings > Install Extension.
  • Claude Code with the plugin: /plugin marketplace update commonpost (or turn on auto-update for the marketplace in /plugin), then /reload-plugins. The plugin always carries the bridge of the release.
  • Other clients (Claude Code without the plugin, Cursor, VS Code, ...): download mcp-bridge.cjs below and put it in place of your copy, then restart the client or reconnect the server (/mcp in Claude Code). The path of your copy is in the MCP configuration of the client (Claude Code: claude mcp get <server name>).
  • Not sure which bridges you have? The options page of the add-on (section Bridge) lists the bridges that connected, each with its version and "Up to date", "Newer version available" or "Update recommended". Claude Desktop and another client on the same computer are two bridges, updated separately.

The .sigstore.json files are provenance attestations, not something to install.

All changes

Added

• A Claude Code plugin: this repository is a plugin marketplace (claude plugin marketplace add commonpost/thunderbird-mcp, then claude plugin install commonpost-mcp@commonpost). The plugin
  (plugins/claude-code/) declares the commonpost-mail server and carries the bridge of the release, so Claude Code
  users have no mcp-bridge.cjs to download or to replace by hand: updating the plugin updates the bridge. Its version
  is the product's and its bridge a byte-for-byte copy of the repository's (the version check requires both), so every
  release reaches plugin users.
  The plugin folder carries its own README, LICENSE and listing icon, as Anthropic's plugin directory requires.