MCP tool errors

[edmond-vanas]

Hi all,

In Claude, I suddenly seem to be missing the layerling_create_shape and layerling_update_object tools. On further inspection, they do exist, but do not load due to an error with the vase shape:

WARNING
inputSchema.properties.vase
type is an array (["object","string"]). This is legal JSON Schema, and some model providers recommend it for nullable fields, but it is less portable: a client that maps tool schemas onto a single-type dialect (such as the OpenAPI subset used for Gemini function declarations) may reject the tool or drop the constraint.
Fix: Split it into anyOf branches, each with a single type — {"anyOf": [{"type": "object"}, {"type": "string"}]}. (Making the property optional instead is a different contract: absent is not the same as null.)
These constructs are legal JSON Schema but are refused or mishandled by some MCP clients, so a tool can work here and fail there.

Is this a bug or caused by something else?

Version 1.139

[henmedia]

@edmond-vanas Thanks for the clear report, that's a bug on my side. Two settings in layerling's tool list, vase on create_shape/update_object and trace on reference_image, give their type as a list. Some MCP clients refuse that, and then they drop the whole tool. I'll switch both to anyOf with a single type each, so the tools load again with the next update. Until then, Claude Code accepts the current schema if you need the tools right away.

And if layerling is useful to you, a small donation helps keep the project going. Thanks! 🙂

[edmond-vanas]

Thanks for the quick update. Expect a donation shortly and thank for this great tool. ;-)

[henmedia]

@edmond-vanas Thank you, that's very kind of you and much appreciated! 🙂 The fix is in and will be part of the next update. Have fun with layerling and Claude.

[henmedia]

@edmond-vanas the fix is out in 1.140.0: create_shape, update_object and reference_image load again in every client. Reload layerling (or update the app) and restart the MCP connection in Claude so it reads the new tool list.