calling [mcp/memory] read_graph without args

[ajoslin103]

fixes: #1273

Problem is that the mcp/memory code [index.js] guards against missing args

  if (!args) {
    throw new Error(`No arguments provided for tool: ${name}`);
  }

But read_graph does not take any args

    case "read_graph":
      return { content: [{ type: "text", text: JSON.stringify(await knowledgeGraphManager.readGraph(), null, 2) }] };

[olaservo]

Could you add some details on how this fix was tested?

[jwtracy]

@ajoslin103 's fix worked for me so I can answer how I tested on their behalf,

Using the https://github.com/mark3labs/mcphost project, I created my own for, added @ajoslin103 's remote, checked out their incoming branch here, and altered my mcphost config file, ~/.mcp.json, from the npx @modelcontextprotocol/memory command to the following:

    "memory": {
      "command": "node",
      "args": [
        "/Users/jwtracy/Source/jwtracy/servers/src/memory/index.ts"
      ]
    },

Before changing the config file, the steps I took to reproduce the error were to provide the memory prompt context to the chat before this interaction resulting in an error:

  You: tell me everything you remember
2025/04/30 09:31:11 INFO 🔧 Using tool name=memory__read_graph

Error calling tool read_graph: No arguments provided for tool: read_graph

After I updated my mcphost config file to the above and providing the memory mcp prompt context, I was able to avoid the error:

  You: tell me everything you remember
2025/04/30 10:23:12 INFO 🔧 Using tool name=memory__read_graph

  Assistant:


  I don't have any information stored in my memory yet.

Note, it has no memory since I just cloned this repo and the memory.json file is not yet present.

I scoured the mark3labs mcp and mcphost projects for an appropriate place to fix this and found that this server response was the source of the error.