Optimize capability and notification according to specification

[dugenkui03]

Summary by CodeRabbit

• New Features
  • Added notifications for changes to resources, prompts, and tools lists, as well as individual resource updates, improving real-time awareness for clients.
  • Enhanced client configuration options, allowing more flexible capability settings during client creation.
• Bug Fixes
  • Improved error reporting by returning a more specific error code when a requested resource is not found.
• Tests
  • Updated tests to use new notification constants and verify the correct error code for missing resources.

[coderabbitai[bot]]

Walkthrough

This update introduces enhancements to both client and server components of the system, focusing on capability management and notification mechanisms. On the client side, the Client struct now distinctly manages client and server capabilities, with new options and getter methods for better configurability and access. The server is updated to send conditional notifications to clients when lists of resources, prompts, or tools change, based on the capabilities negotiated with each client. New constants for notification method names and a specific error code for resource-not-found scenarios are defined. Associated tests are updated to use these constants and to expect the new error codes where appropriate.

Changes

Files/Paths	Change Summary
client/client.go	Refactored Client struct to separate client and server capabilities; introduced ClientOption type and WithClientCapabilities functional option; updated NewClient constructor to accept variadic options; added getter methods for client and server capabilities; changed JSON tag in initialization parameters from "capabilities" to "serverCapabilities".
mcp/types.go	Added new MCP method constants for notifications on resources, prompts, and tools list changes; added RESOURCE_NOT_FOUND error code constant with value -32002.
server/server.go	Updated resource, prompt, and tool addition/deletion methods to send conditional notifications based on respective listChanged capability flags; changed error code returned when no resource handler is found from INVALID_PARAMS to RESOURCE_NOT_FOUND.
server/server_test.go	Replaced hardcoded notification method strings with defined constants; changed expected error code for undefined resource handler tests from INVALID_PARAMS to RESOURCE_NOT_FOUND; enabled tool capabilities in test server initialization.

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📜 Recent review details

Configuration used: CodeRabbit UI Review profile: CHILL Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 792e666cbc26564ed7c70ea5c24fc90927bde9fb and 8ea296f5d0e06e0082d1337d97124ae39318c714.

📒 Files selected for processing (4)

• client/client.go (5 hunks)
• mcp/types.go (2 hunks)
• server/server.go (6 hunks)
• server/server_test.go (6 hunks)

🚧 Files skipped from review as they are similar to previous changes (4)

• server/server_test.go
• mcp/types.go
• client/client.go
• server/server.go

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[dugenkui03]

On my computer, all test run successfully

[ezynda3]

This is great! Thanks for this!