bobostudio/Session Lens

中文

Session insights and one-click shareable HTML replay for DeepSeek Harness (DSH). Generate a deep "health report" for any session, and export it as a self-contained single-file HTML replay — opens offline, easy to share, zero external dependencies.

Complements the official Trajectory view: Trajectory shows the raw event stream; Lens adds aggregated analytics (token breakdown, per-turn timeline, tool stats) and sharing.

Features

📊 Insights view (new session tab)

• 5-way token breakdown: input / output / cache read / cache write / reasoning (compaction calls listed separately)
• Per-turn breakdown: duration, tokens, tool calls, errors
• Tool stats: calls, error rate, wall-clock time
• Activity: compactions, approvals, subagents, LLM retries
• Auto-refreshes every 5s while the session is live

📤 One-click HTML export

• Single file, zero JavaScript, zero network requests: inline SVG charts, native <details> collapsibles
• Full replay: user messages, assistant replies, reasoning (collapsible), tool calls & results, approval/compaction/subagent markers
• Bilingual chrome (zh/en selectable at export)

🔒 Privacy-first (structural guarantees)

• System prompt can never leak: the export renders only whitelisted "story events" — request/header and internal LLM plumbing cannot reach the file
• Tool arguments/results truncated by default (2,000 chars) to avoid leaking file contents; full mode optional
• Local paths masked as ~: the session cwd + user home directory (all slash, drive-letter-case and JSON-escaped variants). Absolute paths outside the cwd (e.g. sibling repo dirs) are kept as-is for readability
• Image attachments never leave the machine
• CSP default-src 'none': the export has no scripting capability at all

Install

dsh plugin --profile web add github:bobostudio/dsh-session-lens

Restart DSH Web, open any session, and click the Lens tab next to Chat / Trajectory.

Preview

These shots were taken from a live DSH Web session (http://127.0.0.1:17893/). After you open a session, Lens sits next to Chat / Trajectory:

How to read it:

• 17.6M tokens total, of which 17.2M is purple cache-read — later turns are riding the prefix cache, not paying the full input again
• Per-turn breakdown shows which round was expensive: turn 4 burned 8.1M input+cache and 46 tool calls; turn 3 finished in 1:14 with 3 calls
• Tool stats are sorted by call count: wall-clock here is dominated by pwsh (66 calls / 4m30s); file reads and writes are essentially free

Export HTML downloads a single-file report (no JavaScript, opens offline). The in-repo sample below has the same analytics plus a full replay, including a tool error, an approval, and a compaction marker:

Clickable samples: docs/example.html · docs/example.en.html

Usage

1. Open a session → the Lens tab shows live analytics
2. Click Export HTML to download the single-file report
3. Export options (remembered): full tool results (off), path masking (on), theme (dark / system / light, default dark), export language (zh/en)

Compatibility

Targets @deepseek-ai/dsh >= 0.1.0-rc.6, web profile. DSH is in developer preview; internal seams (sessions / sessionPersistence / the conversation.view slot) may change between releases — all optional services degrade gracefully. Please file an issue if an upgrade breaks something.

Development

npm install
npm run build     # esbuild → lib/ (Node half + client half)
npm test          # 44 unit/integration tests (node:test, no build needed)
npm run check     # tsc --noEmit

License

MIT