v1.6.0 — MCP Spec 2025-11-25 Compliance

🚀 What's New

Streamable HTTP Transport (#33)

New streamable-http transport option for running the server over HTTP. SSE transport is now deprecated and will emit a warning — migrate to streamable-http or stdio.

AWS_MCP_TRANSPORT=streamable-http aws-mcp-server

Improved Error Handling (#34)

Input validation errors (empty commands, timeouts) are now returned as tool execution errors (isError=True) instead of crashing the JSON-RPC protocol. This enables AI models to self-correct per SEP-1303.

Server Metadata (#35, #36)

• Server description is now exposed to clients via the MCP instructions field
• Server icon metadata added for client UIs that support it

Graceful Shutdown on Client Disconnect (#16)

The stdio transport now monitors for client disconnects using select.poll() (with parent PID fallback on macOS) and exits cleanly instead of leaving orphaned containers.

🐛 Bug Fixes

• Fixed ToolError import mismatch — fastmcp.exceptions.ToolError and mcp.server.fastmcp.exceptions.ToolError are two distinct classes; the wrong one was being used, preventing proper error handling by the MCP SDK
• Fixed CI test hangs — monitor_stdio_disconnect test hung on Linux CI due to unmocked sys.stdin.fileno()

📦 Installation

# pip / uvx
pip install aws-mcp-server==1.6.0

# Docker
docker pull ghcr.io/alexei-led/aws-mcp-server:1.6.0

Full Changelog: v1.5.6...v1.6.0