Hey, thanks for the report. This is a known limitation in Composer 1.5 when working with MCP tools. Instead of calling MCP tools, it tries to access resources directly via URL. A similar bug has already been reported here: Composer 1.5 cannot see full response from Figma official MCP
For now, the workaround is to use Claude Sonnet 4.6, Opus 4.6, or GPT 5.3 Codex for tasks that require MCP. These models call MCP tools correctly.
A few questions to help us debug:
- Which MCP servers do you have configured?
- Do other models (Claude, GPT) work with the same MCP servers without issues?
- Can you share the Request ID from the chat where Composer 1.5 didn’t use MCP? Click the three dots in the top right of the chat, then Copy Request ID.
The team is aware of the issue. Your report helps us prioritize it.