88831b46f6
Move the documentation that had grown to 3000+ lines in README.md onto https://ruby.sdk.modelcontextprotocol.io and slim the README down to a quick start and feature overview, following the Python SDK layout: - Add 21 server pages as the docs/_server/ collection (overview plus transports, discovery, tools, prompts, resources, roots, sampling, elicitation, multi round-trip results, notifications, notification subscriptions, cancellation, progress, ping, completions, logging, pagination, server context, configuration, and custom methods), 8 client pages as the docs/_client/ collection (overview, transports, lifecycle, multi round-trip results, cancellation, ping, pagination, and authorization), and 3 extension pages as the docs/_extensions/ collection (overview, capability extensions, and MCP Apps, following the Extensions Overview recommendation that SDK documentation list the supported extensions) - one page per topic, ordered to match the sidebar of the 2026-07-28 specification, with the client-side APIs (pinging, cancelling, and paginating from MCP::Client) documented under Building Clients - Add top-level Examples and Protocol Versions pages after Installation, linking the runnable examples in examples/ and summarizing the supported protocol versions, the era model, and client negotiation - Render the three sections as just-the-docs collections, which list every page beneath a plain category heading in the sidebar with no folding, and serve every page at an extensionless URL under /server/, /client/, and /extensions/, matching the sibling SDK documentation sites - Replace docs/building-servers.md and docs/building-clients.md with redirects to the new section overview pages via jekyll-redirect-from, redirect the previously published /installation.html to its extensionless URL, fold their content that was missing from README.md into the new pages, and update the Tool argument keys reference comment in lib/mcp/server.rb to the relocated Tools page - Reduce README.md to the badges, a compact feature overview in the Python SDK style, installation instructions, a stdio server and client quick start, and a License section, using absolute URLs for the remaining repository links so they resolve on rubygems.org - Adapt formatting where GitHub rendering habits break on the site: convert the numbered "three ways to define" lists into headings, since kramdown restarts numbering at 1 when code blocks split list items, convert GitHub-style alerts into just-the-docs callouts with the SEP-2260 server-to-client association note raised to a red warning, merge the duplicated Exception Reporting and Configuration Block Data sections into the Configuration page, and relocate the Streamable HTTP settings that were nested under the Logging section into the Transports page - Refresh the migrated content against the current implementation: correct stale claims and broken samples the README carried, note on each session-era feature how it relates to the modern lifecycle of MCP 2026-07-28, and point spec links at the latest revision, keeping deliberate 2025-11-25 pins for pages the modern revision removed - Style the site after the Rails API documentation palette (red links and accents on neutral surfaces) with matching light and dark color schemes, center the sidebar and content as one block, add a Previous/Next footer pager following the sidebar order, open external links in a new tab, and serve the MCP logo as the favicon Every code block and heading from the previous README was verified to have a home in the new docs pages or the slimmed README before the reduction; a few samples were corrected rather than copied, as noted above.
71 lines
2.5 KiB
Markdown
71 lines
2.5 KiB
Markdown
---
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layout: default
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title: Notification Subscriptions
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nav_order: 12
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---
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# Notification Subscriptions
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`subscriptions/listen` is the long-lived notification subscription stream of MCP 2026-07-28 (SEP-2575),
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replacing the legacy HTTP GET listening stream.
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## Subscribing
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The client opts in via the `notifications` filter (`toolsListChanged` / `promptsListChanged` / `resourcesListChanged` / `resourceSubscriptions`),
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the server acknowledges the honored subset with `notifications/subscriptions/acknowledged` as the first stream message,
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and every delivered notification carries the correlating `io.modelcontextprotocol/subscriptionId` in `_meta`.
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The honored subset follows the capabilities the server declares (`listChanged` and `subscribe` flags).
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The client opens the stream with a `subscriptions/listen` request:
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```json
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{
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"jsonrpc": "2.0",
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"id": "listen-1",
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"method": "subscriptions/listen",
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"params": {
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"notifications": { "toolsListChanged": true, "resourceSubscriptions": ["file:///a.txt"] },
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"_meta": {
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"io.modelcontextprotocol/protocolVersion": "2026-07-28",
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"io.modelcontextprotocol/clientInfo": { "name": "my_client", "version": "1.0.0" },
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"io.modelcontextprotocol/clientCapabilities": {}
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}
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}
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}
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```
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The first SSE event on the stream is the acknowledgement:
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```json
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{
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"jsonrpc": "2.0",
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"method": "notifications/subscriptions/acknowledged",
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"params": {
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"notifications": { "toolsListChanged": true, "resourceSubscriptions": ["file:///a.txt"] },
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"_meta": { "io.modelcontextprotocol/subscriptionId": "listen-1" }
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}
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}
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```
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## Transport Support
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The stream is served on the Streamable HTTP modern path; stdio answers `-32601`.
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## Limits and Keepalives
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Concurrent streams are capped by `max_listen_subscriptions:` (default 1000; pass `nil` to remove the cap), and each stream receives an SSE keepalive
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comment frame every `listen_keepalive_interval:` seconds (default 15) so a dropped connection frees its slot; pass `listen_keepalive_interval: nil`
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when an upstream proxy already keeps the stream alive.
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```ruby
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transport = MCP::Server::Transports::StreamableHTTPTransport.new(
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server,
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max_listen_subscriptions: 500,
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listen_keepalive_interval: 30,
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)
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```
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A stream stays open until the client closes the connection; on graceful shutdown via `transport.close`,
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each open stream receives its `subscriptions/listen` response before closing.
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See [Notifications](/server/notifications/) for the notification types themselves and their session scoping.
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