"text content is empty" error ruining session using Fusion 360 MCP server #25218

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1. jakecrowley

   added

   bugSomething isn't workingSomething isn't working

   on May 1, 2026
2. github-actions

   assigned

   rekram1-node

   on May 1, 2026
3. github-actions

   added

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   windows

   on May 1, 2026
4. github-actions commented on May 1, 2026

   

   github-actionsBot

   on May 1, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • text content blocks must be non-empty when using Claude models and tools #24087: Same error ("text content blocks must be non-empty") occurring with Claude models during tool usage, session becomes unusable after the error
   • bug: message pipeline has no final empty-content guard, causing ValidationException on Bedrock and hard failures on other providers #23260: Bug describing missing empty-content guard in the message pipeline causing ValidationException
   • ValidationException: text content blocks must be non-empty when using Bedrock Runtime #15715: Same ValidationException with text content blocks must be non-empty on Bedrock Runtime

   The root cause may be the same — an empty text content block being generated in the message history, possibly when an MCP tool returns non-text (e.g. image/binary) content.
5. rekram1-node commented on May 1, 2026

   

   rekram1-node

   on May 1, 2026

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   @jakecrowley send me session:

   opencode export > session.json
6. rekram1-node

   closed this as completedin #25241on May 1, 2026