Calling a tool with structured output that returns an array of objects throws an error

[pnedkovp]

Inspector Version

• v0.17

Describe the bug
I am using the cli option to get a tool result of a tool with structured output that returns an array of objects. But instead of getting the result I get the following error:

Failed to call tool get_sessions: [
{
"code": "invalid_type",
"expected": "object",
"received": "array",
"path": [
"structuredContent"
],
"message": "Expected object, received array"
}
]

Failed with exit code: 1

To Reproduce
Steps to reproduce the behavior:

1. Call a tool using the cli option eg
   npx @modelcontextprotocol/inspector --cli http://localhost:8868/mcp --transport http --method tools/call --tool-name get_sessions

Expected behavior
The tool result should be displayed.

Environment (please complete the following information):

• OS: OSX
• Terminal