[kvz]

Gemini completed the “Video covers” Builtin but displayed no thumbnails or links because it does not use the result widget. Completed Assembly tools now return a readable file list in MCP text so clients can present the outputs directly.

• Share the formatter across Builtin shortcuts, transloadit_create_assembly, transloadit_get_assembly_status and transloadit_wait_for_assembly.
• List each file’s Step, name and download URL. Prefer signed URLs for private outputs, then ssl_url or url.
• Keep the first 20 files and their metadata in text, with an omitted-file count. Preserve every result in structuredContent and keep the existing widget metadata and behavior.
• Add a patch changeset for @transloadit/mcp-server.

Images use ordinary URL lines rather than Markdown image syntax. This keeps the download address visible in clients with different rendering support; ChatGPT continues to get its previews from the existing widget.

Validation: corepack yarn verify and corepack yarn workspace @transloadit/mcp-server check. The 20 new protocol tests cover completed/running responses on all four tool paths, multiple Steps, the cap and its boundary, metadata-only outputs, signed and fallback URLs, empty results and file labels.

Council review ran twice. Its metadata-loss and private-URL findings were reproduced with failing tests and fixed. The final suggestion to preserve an unbounded JSON fallback was intentionally declined to honor the requested 20-file text cap; an inline comment explains this choice. A live Gemini confirmation remains for the hosted deployment.

_{🤖 Claimed by kvz on framework1/node-sdk since 2026-11-04 · resume: see delegate run}