MCP server asana_search_tasks incompatible with Claude models

[Nathan_Adler]

Hi there,

I’ve tested with Claude code and VScode copilot with Claude sonnet 4, and found that Claude errors with Asana’s MCP server specifically with the inclusion of the model asana_search_tasks. Co-pilot with gpt-4o doesn’t run into this error.

The error is
API Error: 400 {“type”:“error”,“error”:{“type”:“invalid_request_error”,“message”:“tools.105.custom.input_schema.properties: Property keys should match pattern ‘^[1]{1,64}$’”}}

I’d love if someone at Asana could investigate this as a priority to ensure their MCP server serves tools that are compatible with Claude’s tool spec!

Cheers

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1. a-zA-Z0-9_- ↩︎

[ham]

and no answer from Asana as usual

[Phil_Seeman]

cc: @John_Baldo @Mikhail_Melikhov

[Bill_Hewitt]

Hi folks,

Please let us know if you’re still seeing this issue, I believe a fix addressing it went live about 3 weeks ago.