Graceful handling of EOF in mock MCP server

[ayakut16]

Description

Mock server doesn't work with the mcptools cli, e.g. mcp shell mcp mock tool mock-test "description" throws an error:

Error connecting to MCP server: command error: exit status 1, stderr: Added tool: mock-test - description
Starting mock MCP server with 1 tool(s), 0 prompt(s), and 0 resource(s)
Use Ctrl+C to exit
Mock server started, waiting for requests...
Waiting for request...
Received request: tools/list (ID: 1)
Sending response
Waiting for request...
Error decoding request: EOF
Error running mock server: error decoding request: EOF

In order to fix this, I modified the EOF handling in the Start() method to return nil instead of an error when EOF is encountered

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Run mcp shell ./bin/mcp mock tool mock-test "maybe-description" to make sure this fixes the issue described above.
Also added local configuration to claude code to ensure it still works:

"mock-test-local": {
  "command": "/path/to/mcptools/bin/mcp",
  "args": [
    "mock",
    "tool",
    "say_hi",
    "\"says hi\""
  ]
}

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[f]

Thank you this is great!