Add Primitive repository APIs (`ResourceRepository`, `ToolsRepository`, ... )

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#578 opened on Sep 26, 2025 20 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 48/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Active
Tech stack: java
Domain: backend-api-design

Research direction

Start with McpStatelessAsyncServer.java and McpAsyncServer.java, especially the CopyOnWriteArrayList fields referenced in the issue, and trace how resources, tools, prompts, and completions are stored and served. Define the repository API boundary while preserving the current in-memory behavior and allowing user-dependent implementations; done means all four primitive collections use the replaceable APIs without changing existing server behavior.

Written by the indexing model from the issue text.

Description

enhancement feature/repositories P3

Currently, McpStatelessAsyncServer and McpAsyncServer save resources, tools, prompts, and completionswithCopyOnWriteArrayList`.

https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/McpStatelessAsyncServer.java#L60-L68

I want to provide an API (for example, ResourcesRepository) that, by default, uses the current in-memory strategy but can be replaced, for example, by a dynamic implementation that returns a different list of resources depending on the currently authenticated user.

Dominant language: Java
Stars: 3.7k
Forks: 1.1k
Avg merge: 1d 15h
Merged PRs (30d): 9

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