Overview
Overview Subworkflow for analyzing Mattermost attachments. Per-attachment behavior Image** (mime starts with image/, size ≤ MAX_IMAGE_SIZE_BYTES): downloaded and analyzed by OpenAI vision model. Text small** (text-like by mime/extension, size ≤ MAX_TEXT_SIZE_BYTES): downloaded as plain text and inlined into the context block (with line count check ≤ MAX_TEXT_LINES). Text too large** (text-like, exceeds byte or line limit): replaced with a "too big" marker so the agent asks the user for the relevant excerpt. Other** (binaries, oversized images, unknown): replaced with a generic "not analyzed" marker. Setup checklist Set MATTERMOST_BASE_URL in the Config node. Create an HTTP Header Auth credential called "Mattermost PAT" with: Name: Authorization Value: Bearer <your_personal_access_token> Attach this credential to all three HTTP Request nodes (Get file info, Download file, Download text file). Attach your OpenAI credential to the "OpenAI: Analyze Image" node. Tune in Config: VISION_MODEL, MAX_IMAGE_SIZE_BYTES, MAX_TEXT_SIZE_BYTES, MAX_TEXT_LINES. Notes The IF guard short-circuits when file_ids is empty so the parent workflow can call this subworkflow unconditionally. Classification by mime + extension catches .log files served as application/octet-stream. Final output is always a single item with the same shape — safe to consume in the parent. An n8n automation workflow template by Sergei Byvshev.
Sergei Byvshev
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