MCPKit

0.6.0

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Batteries-included scaffolding for exposing a Swift app's features as a Model Context Protocol (MCP) server, built on the official MCP Swift SDK.

What's New

0.6.0

2026-09-08T13:06:55Z

Reject NUL bytes and invalid UTF-8 in text tool results.
Add ResourceError and map it through MCP server resource reads.
Harden tool schema conversion with object-schema validation, diagnostics, and annotation metadata.
Avoid fetching the advertised tool list before callTool unless debug logging is enabled.
Log calls whose names are absent from the advertised tool list.
Add a runnable stdio server example based on MCPToolProvider.

What's Changed

Add MCPKitExample host demonstrating MCPToolProvider by @adamtheturtle in #92
Add SECURITY.md by @adamtheturtle in #82
Add CHANGELOG and release tagging workflow by @adamtheturtle in #80
Harden mcpTools schema conversion and annotation handling by @adamtheturtle in #84
Add ResourceError for readResource failures by @adamtheturtle in #85
Expand DocC and docs for logging, client install, version fallback, and Swift Testing by @adamtheturtle in #83
Fix DocC symbol link for textResult by @adamtheturtle in #94
Add Swift Package Index badges to README by @adamtheturtle in #81
Reject NUL and invalid UTF-8 in textResult by @adamtheturtle in #86
Enable code coverage in CI tests by @adamtheturtle in #90
Debug-log callTool names missing from advertised tools by @adamtheturtle in #87
Test tools-only defaults for runOverStdioUntilExit by @adamtheturtle in #88
Add Linux and Apple platform CI smoke builds by @adamtheturtle in #89
Add DocC preview workflow on pull requests by @adamtheturtle in #91
Add concurrent JSONLLog append performance tests by @adamtheturtle in #93
Use swiftlang URL for swift-docc-plugin dependency by @adamtheturtle in #100
Use generic iOS Simulator destination in CI by @adamtheturtle in #101
Skip tools fetch on callTool unless debug logging is enabled by @adamtheturtle in #102
Fix release workflow tag glob for non-v semver tags by @adamtheturtle in #103
Advertise prompts in MCPKitExample stdio bootstrap by @adamtheturtle in #104
Fix DocC link to Tool.Annotations under mcpAnnotations by @adamtheturtle in #105
Raise SwiftLint file_length error for MCPKitTests by @adamtheturtle in #106
Raise SwiftLint file_length warning for --strict by @adamtheturtle in #107
Bump actions/checkout from 5 to 7 by @dependabot[bot] in #108
Bump softprops/action-gh-release from 2 to 3 by @dependabot[bot] in #109
Prepare 0.6.0 release by @adamtheturtle in #110

Full Changelog: 0.5.1...0.6.0

MCPKit

Scaffolding for exposing Swift app features as a Model Context Protocol server, built on the official MCP Swift SDK.

Documentation | Swift Package Index | Release notes

Installation

.package(url: "https://github.com/adamtheturtle/MCPKit.git", from: "0.1.0")

Add the MCPKit product to your target dependencies.

Product

MCPKit: Provider protocols, server bootstrap, argument helpers, result builders, and activity logging for MCP integrations.
MCPKitExample: Minimal stdio host (swift run MCPKitExample --mcp) demonstrating tools, prompts, and bootstrap.

Client configuration migration

Applications that show client setup instructions or edit client configuration should use MCPClientInstall and its MCPDesktopClient catalogue. Keeping client paths, formats, snippets, and safe file editing in that package prevents duplicate catalogues from drifting.

Requirements

Swift 6.1+
macOS 13+, Mac Catalyst 16+, iOS 16+, watchOS 9+, tvOS 16+, or visionOS 1+

Testing

Unit tests use Swift Testing. See Docs/SwiftTestingMigration.md for the migration status and contribution notes.

License

MIT. See LICENSE.

Description

Swift Tools 6.1.0

View More Packages from this Author

Dependencies

mcp-swift-sdk0.12.1
SwiftDocCPlugin1.5.0

Last updated: Sun Sep 13 2026 09:29:43 GMT-0900 (Hawaii-Aleutian Daylight Time)