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Bump mcp from 0.12.0 to 0.21.0#30

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Bump mcp from 0.12.0 to 0.21.0#30
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dependabot/bundler/mcp-0.21.0

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Bumps mcp from 0.12.0 to 0.21.0.

Release notes

Sourced from mcp's releases.

v0.21.0

Added

  • Support capability extensions per SEP-2133 (#405)
  • Add range validation for MCP::Annotations#priority per MCP specification (#410)
  • Isolate stateless requests in ephemeral sessions per SEP-2567 (#415)

Changed

  • Set OIDC application_type on Dynamic Client Registration per SEP-837 (#408)
  • Fall back to legacy 2025-03-26 OAuth discovery for servers without PRM (#414)

v0.20.0

Added

  • Support W3C Trace Context Propagation via _meta per SEP-414 (#397)
  • Support OAuth client_credentials grant in OAuth client (#399)
  • Add annotations field to MCP::Resource and MCP::ResourceTemplate per MCP specification (#403)

Changed

  • Re-run OAuth flow on 403 insufficient_scope (step-up) (#368)
  • Speed up Tool::Schema validation by 5x to 100x (#369)
  • Use JSON-RPC error envelope for StreamableHTTPTransport errors (#371)
  • Pin RFC 8414 default well-known suffix per SEP-2351 (#395)
  • Default missing MCP-Protocol-Version to 2025-03-26 in StreamableHTTPTransport (#392)

Fixed

  • Preserve the request ID in invalid request error responses (#400)
  • Standardize Resource Not Found errors on -32602 with URI data per SEP-2164 (#402)

v0.19.0

Added

  • Support Client ID Metadata Documents in OAuth client (#361)
  • Request offline_access scope when supported (#365)
  • Add size field to MCP::Resource per MCP specification (#393)

v0.18.0

Added

  • Support server-to-client ping per MCP specification (#358)

Changed

  • Warn on implicit stdio initialization (#338)
  • Cache Tool::Schema validation to avoid re-validating identical schemas (#363)

Fixed

... (truncated)

Changelog

Sourced from mcp's changelog.

[0.21.0] - 2026-06-20

Added

  • Support capability extensions per SEP-2133 (#405)
  • Add range validation for MCP::Annotations#priority per MCP specification (#410)
  • Isolate stateless requests in ephemeral sessions per SEP-2567 (#415)

Changed

  • Set OIDC application_type on Dynamic Client Registration per SEP-837 (#408)
  • Fall back to legacy 2025-03-26 OAuth discovery for servers without PRM (#414)

[0.20.0] - 2026-06-14

Added

  • Support W3C Trace Context Propagation via _meta per SEP-414 (#397)
  • Support OAuth client_credentials grant in OAuth client (#399)
  • Add annotations field to MCP::Resource and MCP::ResourceTemplate per MCP specification (#403)

Changed

  • Re-run OAuth flow on 403 insufficient_scope (step-up) (#368)
  • Speed up Tool::Schema validation by 5x to 100x (#369)
  • Use JSON-RPC error envelope for StreamableHTTPTransport errors (#371)
  • Pin RFC 8414 default well-known suffix per SEP-2351 (#395)
  • Default missing MCP-Protocol-Version to 2025-03-26 in StreamableHTTPTransport (#392)

Fixed

  • Preserve the request ID in invalid request error responses (#400)
  • Standardize Resource Not Found errors on -32602 with URI data per SEP-2164 (#402)

[0.19.0] - 2026-06-13

Added

  • Support Client ID Metadata Documents in OAuth client (#361)
  • Request offline_access scope when supported (#365)
  • Add size field to MCP::Resource per MCP specification (#393)

[0.18.0] - 2026-05-30

Added

  • Support server-to-client ping per MCP specification (#358)

Changed

... (truncated)

Commits
  • db460e5 Merge pull request #420 from koic/release_0_21_0
  • 49a08bf Release 0.21.0
  • 217542f Merge pull request #416 from koic/fix_a_build_error
  • cfc9a69 Fix a build error in the Ruby 3.1 CI matrix
  • c8e0cd9 Merge pull request #415 from koic/stateless_session_isolation
  • aac41cd Merge pull request #408 from koic/dcr_application_type
  • 60f0088 Merge pull request #414 from koic/2025_03_26_backcompat
  • 2c223dd Fall Back to Legacy 2025-03-26 OAuth Discovery for Servers Without PRM
  • eb6ff5d Isolate Stateless Requests in Ephemeral Sessions per SEP-2567
  • a0cd662 Merge pull request #413 from koic/document_tool_argument_symbol_keys
  • Additional commits viewable in compare view

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Bumps [mcp](https://github.com/modelcontextprotocol/ruby-sdk) from 0.12.0 to 0.21.0.
- [Release notes](https://github.com/modelcontextprotocol/ruby-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/ruby-sdk/blob/main/CHANGELOG.md)
- [Commits](modelcontextprotocol/ruby-sdk@v0.12.0...v0.21.0)

---
updated-dependencies:
- dependency-name: mcp
  dependency-version: 0.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file ruby Pull requests that update ruby code labels Jun 24, 2026
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