fix(opencode): ignore MCP resource file downloads#28466
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Resolved the MCP resource @mention path so custom-scheme resources are still readable through resources/read, but their original URI is no longer forwarded to the model as a downloadable file attachment. That prevents the AI SDK from trying to fetch non-http schemes directly while preserving the resolved resource text in the prompt.
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Issue for this PR
Closes #14753 #8920
Partial Fix #15535
Type of change
What does this PR do?
MCP resource @mentions are resolved through
resources/read, then stored as file parts with the original resource URI. For non-text/plainresources, model message conversion was forwarding that original custom URI to the AI SDK as a downloadable file, which caused schemes likestatus://orsimplifier://to fail URL validation.This keeps resolved MCP resource content in the prompt as text, but skips forwarding the original MCP resource file part to the model. The stored part remains available for history/UI, while the AI SDK no longer tries to download custom MCP schemes directly.
How did you verify your code works?
Ran the built artifact from the PR branch and verified that custom file URIs worked.
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