dsh-trajectory

Renders a DeepSeek Harness session log into a shareable HTML trajectory document — the offline, zero-dependency cousin of the official Trajectory view. "Every run leaves a trace", made portable.

Quick start

Node.js 18 or later can render a single uncompressed .jsonl file. Node.js 22.15 or later is required for .jsonl.zstd input and directory mode because those paths use Node's built-in zstd decoder.

Run the pinned v0.4.2 release directly from GitHub without cloning:

npx --yes github:ciceroyang/dsh-trajectory#v0.4.2 ./session.jsonl --out report.html

On Node.js 22.15 or later, compressed input works the same way:

npx --yes github:ciceroyang/dsh-trajectory#v0.4.2 ./session.jsonl.zstd --out report.html

Or clone the source:

git clone https://github.com/ciceroyang/dsh-trajectory.git
cd dsh-trajectory

node trajectory.mjs ./session.jsonl
node trajectory.mjs ./session.jsonl.zstd # Node.js >= 22.15
node trajectory.mjs ./sessions          # newest log wins
node trajectory.mjs ./sessions --all    # merge every session into one chronological volume
node trajectory.mjs ./session.jsonl --since 2026-08-11 --until 2026-08-17 # time-window slice
node trajectory.mjs ./session.jsonl --out report.html

Output: one self-contained HTML file (inline CSS, no external assets) plus the first 16 hex chars of its SHA-256.

What the document contains

• session metadata (id / workspace / time range / turn count / token ledger)
• per-turn timeline: user asks, tool calls (argument briefs + error markers), assistant excerpts
• end-reason annotations (completed / blocked / error / …)

Technical notes

• multi-frame zstd frame scan + per-frame decode (the single-shot-decompress pitfall, algorithm ported from the official format.ts)
• zero dependencies, plain ESM; the HTML renderer is a pure function, fully unit-testable
• all output is HTML-escaped, so hostile log text cannot become script

Use cases

• delivery audit: hand the trajectory to a reviewer with a checkable SHA-256
• incident review: tool errors visible in their exact timeline position
• sharing: no DSH installation needed — open in any browser

Sibling tools

• dsh-report-studio: session → daily/weekly/handoff reports with receipts
• dsh-plugin-starter / dsh-doctor: plugin scaffold / environment doctor