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Add MCP::Client::Stdio transport

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## Motivation and Context

The `MCP::Client` currently only supports HTTP transport (`MCP::Client::HTTP`).
To achieve parity with other MCP SDKs (Python, TypeScript, C#) which provide
stdio client transports for spawning and communicating with server subprocesses,
the Ruby SDK needs a stdio client transport.
https://modelcontextprotocol.io/specification/2025-11-25/basic/transports#stdio

This enables building MCP clients that launch server processes and communicate
via stdin/stdout using newline-delimited JSON-RPC 2.0 messages.

## How Has This Been Tested?

Added tests for process spawning, protocol initialization handshake,
notification handling, error handling, and transport close lifecycle.

## Additional context

Enabled the `Lint/IncompatibleIoSelectWithFiberScheduler` cop in `.rubocop.yml`
to detect accidental use of `IO.select` instead of `IO#wait_readable`.
This commit is contained in:
Koichi ITO 2026-03-18 03:37:27 +09:00
commit 21eef8df9a
1 changed files with 1079 additions and 4 deletions
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3
.rubocop.yml
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@ -11,5 +11,8 @@ AllCops:
Gemspec/DevelopmentDependencies:
Enabled: true
Lint/IncompatibleIoSelectWithFiberScheduler:
Enabled: true
Minitest/LiteralAsActualArgument:
Enabled: true