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Changelog

All notable changes to FsMcp are documented here. Format follows Keep a Changelog.

[1.0.0] - 2026-04-03

Added

FsMcp.Core

  • Domain types: Content, ResourceContents, McpRole, McpMessage, McpError
  • Identifier types with smart constructors: ToolName, ResourceUri, PromptName, MimeType, ServerName, ServerVersion
  • ValidationError DU for structured error reporting
  • JSON serialization with custom converters for DUs (MCP wire format)
  • Internal Interop module for F# <-> C# SDK type conversion

FsMcp.Server

  • mcpServer { } computation expression for declarative server definition
  • Tool.define, Resource.define, Prompt.define convenience functions
  • TypedTool.define<'T> with TypeShape-powered JSON Schema generation and caching
  • mcpTool { } nested CE for cleaner tool definitions
  • StreamingTool.define for IAsyncEnumerable<Content> handlers
  • ContextualTool.define<'T> with notification support (progress + logging)
  • Middleware.compose and Middleware.pipeline for composable middleware
  • ValidationMiddleware — auto-validates tool args against JSON Schema
  • Telemetry.tracing() — Activity-based spans (OpenTelemetry compatible)
  • Telemetry.MetricsCollector — request counts and durations
  • DynamicServer — add/remove tools at runtime with change events
  • Server.run (stdio) and Server.runHttp (HTTP/SSE via ASP.NET Core)

FsMcp.Client

  • Typed client: McpClient.connect, callTool, listTools, readResource, getPrompt, disconnect
  • ClientTransport.stdio, http, httpWithHeaders
  • McpClientAsync module with Async<'T> wrappers

FsMcp.Testing

  • TestServer.callTool/readResource/getPrompt — direct handler invocation
  • Expect.mcpHasTextContent, mcpIsError, mcpIsSuccess, mcpHasContentCount
  • McpArbitraries — FsCheck generators for all domain types

FsMcp.TaskApi

  • ClientPipeline with taskResult { } CE via FsToolkit.ErrorHandling
  • Pipe-friendly: client |> ClientPipeline.callToolText "name" args

FsMcp.Sampling

  • SamplingRequest builders: simple, withSystem, withTemperature, withModel
  • SamplingTool.define<'T> — tools that invoke client LLM
  • mockSample and noOpSample for testing

Examples

  • EchoServer — echo + reverse tools, resource, prompt
  • Calculator — add/subtract/multiply/divide
  • FileServer — read_file, list_directory, file_info

Infrastructure

  • 308 Expecto + FsCheck tests across 6 projects
  • NuGet packaging for all 6 libraries
  • README with architecture diagrams