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Attach PDF files to agent messages

Changelog

Feature Platform CloudUI, API

In 0.26.0

Agents can read PDF documents sent with a message.

In the UI: the chat composer offers PDF attachments when the selected model accepts PDF input, and shows each attachment as a file chip.

In the API: upload a PDF with POST /v1/files (PDF only, up to 32 MB), then reference it as a file content part in the message. GET /v1/files, GET /v1/files/{id} and DELETE manage stored files. Everruns converts the attachment for each provider, including Anthropic documents, Gemini inline data, Bedrock documents and OpenAI file inputs.

See UI. #3535