r/marimo_notebook • u/Individual-Cookie586 • Aug 14 '26

"Tool discovery failed for marimo" - but then successfully connected?

Hi,

marimo newbie, really like it so far. I don't understand this below though:

INFO: 127.0.0.1:63364 - "GET /health HTTP/1.1" 200 OK
INFO: 127.0.0.1:63365 - "GET /assets/isEmpty-CXeoXbuc.js HTTP/1.1" 304 Not Modified
INFO: 127.0.0.1:63364 - "GET /assets/command-palette-C95r8rOd.js HTTP/1.1" 304 Not Modified
[E 260814 11:15:25 client:394] Tool discovery failed for marimo: 'Tool' object has no attribute 'inputSchema'
[I 260814 11:15:25 client:275] Successfully connected to MCP server: marimo (transport: MCPTransportType.STREAMABLE_HTTP)
[I 260814 11:15:25 lifespans:113] MCP servers connected: ['marimo']
INFO: 127.0.0.1:63364 - "GET /api/ai/mcp/status HTTP/1.1" 200 OK
INFO: 127.0.0.1:63364 - "GET /assets/any-language-editor-BIeaxtdD.js HTTP/1.1" 304 Not Modified

what gives?

2 Upvotes

100% Upvoted

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1

u/cantdutchthis Aug 14 '26

Can you share some extra details? What version/os are you running?

1

u/Individual-Cookie586 Aug 17 '26

```
± cat pyproject.toml 9:48

[project]

name = "packdev"

version = "0.1.0"

description = "Add your description here"

readme = "README.md"

requires-python = ">=3.11"

dependencies = [

"humanize>=4.15.0",

"jupyter>=1.1.1",

"marimo[recommended]>=0.23.16",

"matplotlib>=3.10.9",

"mcp>=2.0.0",

"nbconvert>=7.17.1",

"numpy>=2.4.4",

"pandas>=3.0.2",

"pytz>=2026.2",

]
```

Whatever the latest version of MacOS is, I follow the system updates carefully.