cxxmcp 1.2.4
C++ MCP SDK
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Changelog

1.2.4

  • Prepared release metadata and package references.

1.2.3

  • Prepared release metadata and package references.

1.2.2

  • Prepared release metadata and package references.

1.2.1

  • Prepared release metadata and package references.

1.2.0

  • Prepared release metadata and package references.

1.1.6

  • Fixed CXXMCP_REFLECT so reflected DTO specializations compile correctly across GCC, MinGW, and CodeQL analysis builds.
  • Updated reflection examples and documentation to use namespace-scope/global registrations consistently.

1.1.5

  • Prepared release metadata and package references.

1.1.4

  • Prepared release metadata and package references.

1.1.3

  • Prepared release metadata and package references.

1.1.2

  • Fixed mcp::core::Result ABI stability by keeping tl::expected as the public backend across all supported C++ standards.
  • Fixed C++23 HTTP SDK builds by making the server HTTP holder complete before std::unique_ptr cleanup is instantiated.
  • Removed unused optional plugin/adapters extension targets and headers.
  • Removed unused vendored tcb/span.hpp.
  • Added an opt-in benchmark target and Streamable HTTP benchmark driver.
  • Cleaned stale root Markdown docs and compressed the root TODO to active release evidence gates.

1.1.1

  • Implemented SEP-1699 SSE retry/reconnection in the SDK client HTTP transport.
  • Fixed SSEClient last_event_id_ tracking for priming events with empty data.
  • Updated conformance status: server 109/1, client 447/0 (OpenSSL).

1.1.0

  • Separated HTTP transport behind the CXXMCP_ENABLE_HTTP compile-time flag (default OFF) so that the core SDK builds without cpp-httplib.
  • Added CXXMCP_ENABLE_AUTH flag to the release-blocking CI matrix.
  • Fixed CMake export set to include cpp_httplib when HTTP is enabled.
  • Fixed CI validation scripts for VERSION-file variable references and updated vcpkg overlay port path to cxxmcp-sdk.
  • Added MinGW provisional compatibility policy documentation.

1.0.0

  • Added explicit protocol-version coverage for the 2025-11-25 MCP snapshot and closed the P1 protocol model evidence gaps for required-field, type-constraint, and object-presence capability behavior.
  • Added a lightweight default WWW-Authenticate parser to the optional cxxmcp::auth public surface, including support for quoted parameters, escaped strings, token68 payloads, case-insensitive parameter lookup, and focused auth tests.
  • Changed the default in-memory token store to keep entries separated by the complete resource/issuer/client token key instead of overwriting unrelated credentials.
  • Documented the external cxxmcp-examples auth-lite coverage and kept the examples path aligned with Peer / Service as the canonical SDK entry.

1.0.0 (pre-release)

  • Reframed the public SDK around Peer / Service entry points.
  • Kept client / server as compatibility and convenience wrappers.
  • Added HTTP URI support and auth header support for client transport setup.
  • Added HTTP auth-lite server behavior: authentication failures are reported as auth-category JSON-RPC errors and Streamable HTTP maps them to 401 Unauthorized with configurable WWW-Authenticate.
  • Added the optional cxxmcp::auth scaffold target for OAuth 2.1 / DPoP contracts and public header smoke coverage.
  • Applied client HTTP bearer-token helpers consistently to Streamable HTTP POST, SSE GET, and session DELETE requests.
  • Added ClientPeer and ServerPeer examples.
  • Aligned process_stdio_client with the peer/service path.
  • Routed native ClientPeer initialize, synchronous helpers, paginated helpers, outbound notifications, and service shutdown through Peer-owned transport paths.
  • Added ClientPeer handler registration helpers so normal client callbacks no longer require accessing the underlying client::Client.
  • Added ServerPeer handler registration helpers so normal server callbacks no longer require accessing the underlying server::Server.
  • Marked ClientPeer::client() and ServerPeer::server() as deprecated compatibility escape hatches.
  • Tightened process stdio response-id validation with stable transport errors.
  • Covered process stdio server-to-client handler-error round trips on both concrete and role-generic transports.
  • Covered stdio malformed-input and role-generic server close failure paths.
  • Reject mismatched JSON response ids on the legacy HTTP client transport.
  • Covered native Streamable HTTP client mismatched response ids and duplicate in-flight request ids with stable transport errors.
  • Covered native process-stdio client mismatched response ids and duplicate in-flight request ids with stable transport errors.
  • Return HTTP 400 for malformed Streamable HTTP POST bodies and cover the direct server transport path.
  • Documented why concrete stdio transports do not own duplicate in-flight request-id validation.
  • Moved native ClientPeer inbound request and notification dispatch onto Peer-owned roots and handler state.
  • Moved native ServerPeer notification dispatch for Peer-registered notification handlers onto Peer-owned state.
  • Routed ServerPeer ping request handling through the Peer boundary before falling back to the concrete server dispatcher.
  • Routed ServerPeer initialize request validation and response construction through the Peer boundary before falling back to the concrete server dispatcher.
  • Routed ServerPeer raw request override state plus tools/list and tools/get discovery handling through the Peer boundary.
  • Routed non-task tools/call handling through the ServerPeer boundary with Peer-owned cancellation token propagation.
  • Routed task-aware tools/call handling through the ServerPeer boundary by invoking the configured task manager directly.
  • Routed ServerPeer prompt/resource discovery and read handling through the Peer boundary while preserving session context for handlers.
  • Routed resource subscribe/unsubscribe handling through ServerPeer, using the native transport's compatibility adapter as the subscription identity.
  • Routed Peer-registered completion, sampling, and logging request handlers through the ServerPeer boundary.
  • Routed Peer-registered task lifecycle request handlers through the ServerPeer boundary.
  • Added cancellation-aware client inbound handler overloads for roots, sampling, elicitation, and custom server-to-client requests on both Client and ClientPeer.
  • Added ServerBuilder::with_handler() so aggregate and contract-style server handlers can be installed during construction instead of through a long mutable setter sequence.
  • Added a dedicated SDK umbrella test for cxxmcp/sdk.hpp.