---
title: Trajectory Reader
emoji: 🧭
colorFrom: green
colorTo: gray
sdk: static
app_file: index.html
pinned: false
short_description: Read any HF dataset's messages with your own access
hf_oauth: true
hf_oauth_scopes:
  - read-repos
hf_oauth_expiration_minutes: 43200
hf_oauth_authorized_org: NewsBreak
---

# Trajectory Reader

Renders the `messages` (or `conversations`, `prompt`/`completion`, …) column of
any Hugging Face dataset row as a chat transcript: system / user / assistant /
tool turns, reasoning blocks, tool calls with arguments, tool results, plus the
`tools` schema and the remaining columns in a side rail.

**Permissions are the Hub's.** This page ships no data and no token, and there is
no token box — signing in with your Hugging Face account is the only way in
(NewsBreak members only). Every request goes from your browser straight to
`datasets-server.huggingface.co` / `huggingface.co` carrying your own OAuth
token, so you can only open datasets you already have access to, and no
credential is ever typed into or stored by this page.

Source: `data_pipeline/hf_messages_viewer.html` in the local-trajectories repo.