feat: add missing SetPrompts, DeleteResources, and SetResources methods

[vasayxtx]

Description

Adds missing methods to achieve complete API parity across Tools, Prompts, and Resources in MCPServer:

• SetPrompts: Atomically replaces all existing prompts with provided list
• DeleteResources: Removes multiple resources by URI
• SetResources: Atomically replaces all existing resources with provided list

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• MCP spec compatibility implementation
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring (no functional changes)
• Performance improvement
• Tests only (no functional changes)
• Other (please describe):

Checklist

• My code follows the code style of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• I have updated the documentation accordingly

Summary by CodeRabbit

• New Features
  • Introduced options to add, delete, and replace resources and prompts on the server.
• Improvements
  • The server now automatically notifies all active sessions when resource or prompt lists change.
• Tests
  • Added comprehensive tests to verify resource and prompt management and notification behaviors.

[coderabbitai]

"""

Walkthrough

This change adds batch management methods to MCPServer for resources and prompts, including deleting multiple resources, replacing all resources, and replacing all prompts. It also sends notifications to active sessions when resource or prompt lists change. Comprehensive tests for these new behaviors are included.

Changes

Files	Change Summary
server/server.go	Added DeleteResources, SetResources, and SetPrompts methods for batch resource and prompt management.
server/server_test.go	Added TestMCPServer_Resources and extended TestMCPServer_Prompts to verify notifications and list updates.

Possibly related PRs

• mark3labs/mcp-go#266: Modifies single-item resource removal to avoid unnecessary notifications; related to resource deletion and notification logic here.
• mark3labs/mcp-go#320: Adds batch prompt removal (DeletePrompts); complements batch prompt and resource management in this PR.
• mark3labs/mcp-go#141: Adds single-item resource removal method; related to resource deletion but at different granularity.

Suggested reviewers

• ezynda3
• pottekkat
• robert-jackson-glean
  """

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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 2eaf2b3 and af97501.

📒 Files selected for processing (2)

• server/server.go (2 hunks)
• server/server_test.go (2 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• server/server.go

🧰 Additional context used

🧠 Learnings (1)

server/server_test.go (3)

Learnt from: octo
PR: mark3labs/mcp-go#149
File: mcptest/mcptest.go:0-0
Timestamp: 2025-04-21T21:26:32.945Z
Learning: In the mcptest package, prefer returning errors from helper functions rather than calling t.Fatalf() directly, giving callers flexibility in how to handle errors.

Learnt from: ezynda3
PR: mark3labs/mcp-go#461
File: server/sampling.go:22-26
Timestamp: 2025-06-30T07:13:17.052Z
Learning: In the mark3labs/mcp-go project, the MCPServer.capabilities field is a struct value (serverCapabilities), not a pointer, so it cannot be nil and doesn't require nil checking. Only pointer fields within the capabilities struct should be checked for nil.

Learnt from: lariel-fernandes
PR: mark3labs/mcp-go#428
File: www/docs/pages/servers/prompts.mdx:218-234
Timestamp: 2025-06-20T20:39:51.870Z
Learning: In the mcp-go library, the GetPromptParams.Arguments field is of type map[string]string, not map[string]interface{}, so direct string access without type assertions is safe and correct.

🔇 Additional comments (2)

server/server_test.go (2)

965-1008: LGTM! Well-structured test for SetPrompts method.

The test case follows established patterns and comprehensively validates the SetPrompts functionality, including proper notification behavior and final state verification.

---

1044-1247: LGTM! Comprehensive test coverage for new resource management methods.

This new test function provides excellent coverage for the newly added DeleteResources and SetResources methods. The test cases are well-structured and validate:

• Proper notification behavior for resource deletions and updates
• Correct handling of single and multiple resource operations
• No-op behavior when attempting to delete non-existent resources
• Atomic replacement behavior of SetResources

The implementation follows established testing patterns and maintains consistency with the existing codebase.

✨ Finishing Touches

• 📝 Generate Docstrings

---

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[vasayxtx]

Hi @ezynda3, @pottekkat,
Could you please review/merge this? I need SetPrompts and SetResources to safely update data without races in my project.
Thanks!