feat: open content interface for users to freely implement

[foolslove]

Description

Features: make pepole easy to customize Cotent interface

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

MCP Spec Compliance

• This PR implements a feature defined in the MCP specification
• Link to relevant spec section: Link text
• Implementation follows the specification exactly

Additional Information

1. Exposing the IsContent method through the public content interface empowers users to define custom content types, ensuring seamless compatibility with diverse response scenarios.

Summary by CodeRabbit

• Refactor
  • Updated method names in the content interface and its implementations for consistency with naming conventions. No changes to functionality or user experience.

[coderabbitai]

Walkthrough

The changes update the Content interface and its implementations in mcp/types.go by renaming the method isContent() to IsContent(). The import order is also adjusted, placing the third-party package import after standard library imports. No other modifications are present.

Changes

File(s)	Change Summary
mcp/types.go	Renamed isContent() to IsContent() in Content interface and all implementations; reordered imports.

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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 baa7153 and d225c88.

📒 Files selected for processing (1)

• mcp/types.go (7 hunks)

🧰 Additional context used

🧠 Learnings (2)

📓 Common learnings

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.

mcp/types.go (6)

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: 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: 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.

Learnt from: davidleitw
PR: mark3labs/mcp-go#451
File: mcp/tools.go:1192-1217
Timestamp: 2025-06-26T09:38:18.629Z
Learning: In mcp-go project, the maintainer prefers keeping builder pattern APIs simple without excessive validation for edge cases. The WithOutput* functions are designed to assume correct usage rather than defensive programming, following the principle of API simplicity over comprehensive validation.

Learnt from: xinwo
PR: mark3labs/mcp-go#35
File: mcp/tools.go:0-0
Timestamp: 2025-03-04T07:00:57.111Z
Learning: The Tool struct in the mark3labs/mcp-go project should handle both InputSchema and RawInputSchema consistently between MarshalJSON and UnmarshalJSON methods, even though the tools response from MCP server typically doesn't contain rawInputSchema.

Learnt from: xinwo
PR: mark3labs/mcp-go#35
File: mcp/tools.go:107-137
Timestamp: 2025-03-04T06:59:43.882Z
Learning: Tool responses from the MCP server shouldn't contain RawInputSchema, which is why the UnmarshalJSON method for the Tool struct is implemented to handle only the structured InputSchema format.

🔇 Additional comments (6)

mcp/types.go (6)

11-13: LGTM: Import ordering follows Go conventions.

The reordering of imports to place standard library imports before third-party imports follows Go best practices and improves code organization.

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863-863: LGTM: Exposing the interface method enables custom content implementation.

Making IsContent() exported allows users to implement custom content types by satisfying the public Content interface, which aligns with the PR objective of providing greater flexibility.

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875-875: LGTM: Method implementation correctly updated.

The TextContent implementation properly reflects the interface change, maintaining compliance with the updated Content interface.

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888-888: LGTM: Method implementation correctly updated.

The ImageContent implementation properly reflects the interface change, maintaining compliance with the updated Content interface.

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901-901: LGTM: Method implementation correctly updated.

The AudioContent implementation properly reflects the interface change, maintaining compliance with the updated Content interface.

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917-917: LGTM: Method implementations correctly updated.

Both ResourceLink and EmbeddedResource implementations properly reflect the interface change, maintaining compliance with the updated Content interface.

Also applies to: 929-929

✨ Finishing Touches

• 📝 Generate Docstrings

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