v3.1.0 — Session Explorer & Cost Estimation

What's New in v3.1.0

Session Explorer

New /sessions page for browsing individual Claude Code sessions per project. Parses JSONL files directly from ~/.claude/projects/ — no API calls needed.

• Project browser — Discover all projects with session counts, token totals, and date ranges
• Project overview cards — Compare projects side-by-side (sessions, tokens, models, estimated cost)
• Sortable session table — Sort by date, duration, messages, tokens, or cost. Shows model badges, git branch, and first prompt preview
• Session transcript viewer — Full conversation timeline with role badges (User/Assistant/Tool Result), timestamps, tool call tags, and per-message token breakdown
• Tool usage chart — Horizontal bar chart showing tool invocation frequency per project
• Streaming dedup — Correctly handles Claude's streaming accumulation by deduplicating assistant messages by requestId

Estimated API Cost

Both the Session Explorer and Usage Analytics now show estimated API costs based on per-model token pricing:

• Opus — $15/$75 per MTok (input/output)
• Sonnet — $3/$15 per MTok
• Haiku — $0.80/$4 per MTok
• Cache read/write rates included in calculations

Cost appears in:

• Analytics overview cards (total estimated cost)
• Model usage breakdown table (per-model cost column)
• Session Explorer project cards (aggregate cost)
• Session list table (sortable per-session cost)

Backend

• New Rust service session_explorer.rs (~600 lines) with memory-efficient line-by-line JSONL parsing
• 3 new Tauri commands: get_session_projects, get_project_sessions, get_session_detail
• Content extraction handles both string and array content blocks
• Unit tests for parsing, dedup, and edge cases

Frontend

• 5 new Svelte components in src/lib/components/sessions/
• New sessionStore with Svelte 5 runes, sorting, and derived aggregates
• TypeScript types mirroring all Rust structs
• Sidebar updated with Sessions nav item under Insights group

Full Changelog: v3.0.0...v3.1.0