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Release 1.2.0

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This release completes the SEP-2575 stateless lifecycle of the 2026-07-28 specification,
together with the SEP-2322, SEP-2549, and SEP-2243 features that revision builds on.

Several entries under "Changed" are incompatible with 1.1.0 and ship in a minor release
under the spec-conformance and security exceptions in VERSIONING.md.
Servers no longer echo 2026-07-28 from `initialize` and counter-offer 2025-11-25 instead,
`Configuration` accepts only handshake versions for its `protocol_version` pin,
server-to-client requests are bounded by a timeout and refused outright on the modern lifecycle,
the client bounds automatic pagination and its total SSE reconnection wait,
and `prompts/get` answers Invalid Params where it used to answer Internal Error.

Closes #512.
This commit is contained in:
Koichi ITO 2026-08-15 11:38:36 +09:00
commit af02717e28
2 changed files with 48 additions and 1 deletions
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47
CHANGELOG.md
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@ -7,6 +7,53 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
## [Unreleased]
## [1.2.0] - 2026-08-15
This release completes the SEP-2575 stateless lifecycle of the 2026-07-28 specification, together with
the SEP-2322, SEP-2549, and SEP-2243 features that revision builds on. Several entries under "Changed"
are incompatible with 1.1.0 and ship in a minor release under the spec-conformance and security exceptions
described in [VERSIONING.md](VERSIONING.md).
### Added
- Handle the SEP-2575 modern request envelope in the server core (#475)
- Serve both lifecycle eras over stdio with an era lock per SEP-2575 (#478)
- Serve the sessionless modern path over Streamable HTTP per SEP-2575 (#479)
- Finalize `server/discover` and add client modern lifecycle support per SEP-2575 (#480)
- Let handlers return multi round-trip `input_required` results per SEP-2322 (#481)
- Add `MCP::Elicitation::EnumSchema` builders per SEP-1330 (#482)
- Stamp the required `resultType` on modern results per SEP-2322 (#487)
- Enforce the modern lifecycle admission rules per SEP-2575 (#489)
- Stream modern request notifications and honor the envelope `logLevel` per SEP-2575 (#490)
- Expose the user-defined `server_context` in instrumentation data (#493)
- Serve the `subscriptions/listen` notification stream per SEP-2575 (#495)
- Add opt-in `requestState` sealing via `MCP::Server::RequestStateSecurity` (#496)
- Mirror `x-mcp-header` tool parameters into `Mcp-Param-*` headers per SEP-2243 (#498)
- Stamp the required cache hints on modern cacheable results per SEP-2549 (#499)
- Drive multi round-trip `input_required` results on the client per SEP-2322 (#500)
- Fulfill `input_required` results on the legacy wire per SEP-2322 (#501)
### Changed
- Align modern envelope validation with the finalized specification (#491)
- Require the `Mcp-Method` header on the modern path (#492)
- Bound server-to-client requests with a timeout (#502)
- Refuse server-to-client requests in the modern lifecycle per SEP-2575 (#503)
- Bound the total wait across SSE reconnection attempts (#504)
- Bound automatic pagination in the MCP client (#505)
- Reject modern-removed methods before the connection era locks (#511)
- Stop negotiating modern protocol versions through the `initialize` handshake (#516)
### Deprecated
- Warn on modern client connects that declare the Roots or Sampling capabilities deprecated per SEP-2577 (#406, #516)
### Fixed
- Stop leaking exception messages to clients via JSON-RPC error data (#486)
- Return Invalid Params for unknown prompts and missing prompt arguments (#517)
- Restrict OAuth discovery to same-origin metadata URLs and refuse private-network destinations
## [1.1.0] - 2026-08-01
### Added

2
lib/mcp/version.rb
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@ -1,5 +1,5 @@
# frozen_string_literal: true
module MCP
VERSION = "1.1.0"
VERSION = "1.2.0"
end