[Feature]: Add Per-Tool Execution Logs and Observability for Tools

[0xKoller]

Problem statement

Currently, when a tool is invoked during an MCP server run (e.g., by an agent, user query, or workflow), there is zero built-in visibility into what happened. Developers have no straightforward way to observe:

• Which specific tool was called
• When the tool execution started and finished
• How long the tool took to complete
• Whether the tool call succeeded or failed
• Any basic error message if it failed

Proposed solution

Emit structured logs for every tool/prompt/resource execution:

[tool] Executing 'get-weather' | input: { "location": "Buenos Aires" }
[tool] 'get-weather' completed | duration: 320ms | success

This should be enable/disable from the xmcp.config.ts

Package

xmcp (core framework)

[FiammaMuscari]

Opened a PR for this: #527