We are pleased to announce the v1.0.0-RC3 release 🚀 marking the beginning of a stable 1.x release line.

What's Changed

• Move mcp-spring-webflux and mcp-spring-webmvc to Spring AI 2.0 by @tzolov in #805
• Remove deprecations from 1.0.0 by @chemicL in #807
• Conformance testing: add auth conformance testing by @Kehrlann in #806
• Add governance documentation for SEP-1730 by @chemicL in #808
• Fix and simplification for osgi manifest.mf generation by @scottslewis in #792
• Update SECURITY.md to use GitHub Security Advisories by @localden in #801
• Change StackOverflow link and tag for support by @chemicL in #824

New Contributors

• @scottslewis made their first contribution in #792
• @localden made their first contribution in #801

Full Changelog: v0.18.1...v1.0.0-RC3

What's Changed

• Fix and simplification for osgi manifest.mf contents generation - Cherry-picked from main (159eb96)

Full Changelog: v0.18.0...v0.18.1

What's Changed

• fix: Fixed html encoding in javadoc by @ashakirin in #727
• fix: Enable javadoc generation for modules with OSGi metadata by @jonathanhefner in #705
• fix: Support form and url fields in Elicitation capability per 2025-11-25 spec by @rhtnr in #731
• add 2025-11-25 version to ProtocolVersions by @sdelamo in #733
• Expose resourcesUpdateConsumer() in sync client by @Randgalt in #735
• Upgrade to testcontainers 1.21.4 by @sdeleuze in #743
• Fix everything-server-based tests by @chemicL in #756
• Add Support for Jackson 3 and use it by default by @filiphr in #742
• Decouple mcp-test and mcp-spring modules from Jackson implementation by @chemicL in #760
• Conformance tests by @chemicL in #767
• Use junit.version for all junit dependencies by @filiphr in #752
• Update JUnit 5.10.2 -> 6.0.2 by @Kehrlann in #769
• Validate origin header by @Kehrlann in #771
• feat: broadcast 2025-11-25 as latest supported client version by @LucaButBoring in #758
• feat: added tools name format validation accordingly #SEP-986 by @ashakirin in #764
• Moves mcp-json API back into mcp-core for simplified dependencies and support of osgi runtimes by @Kehrlann in #779
• DNS rebinding protection: check host header by @Kehrlann in #775
• Refine McpJsonDefaults method names by @sdeleuze in #789
• Add embedded MkDocs documentation site by @tzolov in #795

New Contributors

• @ashakirin made their first contribution in #727
• @jonathanhefner made their first contribution in #705
• @rhtnr made their first contribution in #731
• @sdeleuze made their first contribution in #743
• @filiphr made their first contribution in #742

Full Changelog: v0.17.2...v0.18.0

This release:

• Addresses mostly the testing infrastructure issues.
• Fixes a client-side issue with servers that process client-initiated notifications with a 202 Accepted HTTP Header.

Full Changelog: v0.17.1...v0.17.2

Bug fix release:

Full Changelog: v0.17.0...v0.17.1

What's Changed

• Fix experimental client capabilities tests by @Kehrlann in #670
• Fix typo in test name by @mingo1996 in #661
• Client transports: make #protocolVersions() configurable by @Kehrlann in #669
• chore: Spring 5 compatibility by @He-Pin in #649
• Fix the baseUrl is configured with a trailing slash #645 by @leehaut in #646
• WebMvcSseServerTransportProvider: do not include session ID in SSE event by @Kehrlann in #677
• refactor: use builder pattern for CallToolResult and simplify lambda expressions in tests by @codeboyzhou in #652
• Basic version negotiation capabilities by @Kehrlann in #684
• Revert "WebClientStreamableHttpTransport: use Spring-5 compatible met…hods (#649)" by @tzolov in #696

New Contributors

• @mingo1996 made their first contribution in #661

Full Changelog: v0.16.0...v0.17.0

What's Changed

• feat: enhance error handling with custom error code preservation by @tzolov in #653
• Bump json-schema-validator from 1.5.7 to 2.0.0 by @uarlouski in #660
• fix: JSONRPCResponse JavaDoc by @vorburger in #657
• fix(docs): Remove broken @see link in McpServer.java Javadoc by @hbsjz-swl in #614
• feat(schema): support Object type for progressToken by @tzolov in #663

New Contributors

• @uarlouski made their first contribution in #660
• @vorburger made their first contribution in #657
• @hbsjz-swl made their first contribution in #614

Full Changelog: v0.15.0...v0.16.0

What's Changed

• define explicitely that values should always be included in code completions by @sdelamo in #601
• fix remove name when using @JsonTypeInfo(use = JsonTypeInfo.Id.DEDUCTION) by @sdelamo in #600
• refactor: change int to Integer for optional numeric fields by @tzolov in #604
• fix: allow additional properties by default per JSON Schema spec by @tzolov in #617
• Close McpTransportSession on transport close by @Kehrlann in #632
• Fix: McpAsyncClient#listTools prevent infinite recursion by @leehaut in #631
• chore: standardize client/server implementation names and version by @tzolov in #642
• Update dependencies minor versions to fix build on JDK 25 by @bedrin in #640
• Support o.s.h.HttpHeaders from both 6.x and 7.x Spring branches by @bedrin in #639

New Contributors

• @leehaut made their first contribution in #631
• @bedrin made their first contribution in #640

Full Changelog: v0.14.1...v0.15.0

Full Changelog: v0.14.0...v0.14.1

What's Changed

• refactor: Improve resource template management and API consistency by @tzolov @pascalconfluent #576
• fix: handle resource not found according to spec by @sdelamo in #567
• feat: add optional lastModified field to Annotations record by @tzolov in #568
• fix: typo MCP_SESSION_ID, keep consistent style with other identifiers by @JunJieLiu51520 in #564
• refactor: improve MCP server resilience and error handling by @tzolov in #579
• fix: when using JsonTypeInfo.DEDUCTION don’t add include by @sdelamo in #587
• Client: handle server responses with Content-Length: 0 by @Kehrlann in #588
• fix: Handle non-compliant notification responses by @tzolov in #589
• feat(client): add client tool output schema validation and caching by @pantanurag555 @tzolov @chemicL @Kehrlann #302

New Contributors

• @JunJieLiu51520 made their first contribution in #564

Full Changelog: v0.13.1...v0.14.0