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+# FINDINGS.md -- go-session
+
+## 2026-02-19: Split from core/go (Virgil)
+
+### Origin
+
+Extracted from `forge.lthn.ai/core/go` `pkg/session/` on 19 Feb 2026.
+
+### Architecture
+
+- Parses Claude Code JSONL transcripts into an `Event` array
+- Each event has type, timestamp, content, and optional tool metadata
+- Supported tool types: Bash, Read, Edit, Write, Grep, Glob, Task
+
+### Dependencies
+
+- Zero external dependencies -- standard library only (`encoding/json`, `bufio`, `os`)
+
+### Tests
+
+- Test coverage for JSONL parsing and event type detection
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+# TODO.md -- go-session
+
+## Phase 1: Parser Robustness
+
+- [ ] Handle truncated JSONL (incomplete final line, missing closing brace)
+- [ ] Handle very large sessions (streaming parse, avoid loading entire file into memory)
+- [ ] Handle non-standard tool formats (custom MCP tools, unknown tool names)
+- [ ] Add graceful error recovery -- skip malformed lines, log warnings
+
+## Phase 2: Analytics
+
+- [ ] Session duration stats (start time, end time, wall clock, active time)
+- [ ] Tool usage frequency (count per tool type, percentage breakdown)
+- [ ] Error rate tracking (failed tool calls, retries, panics)
+- [ ] Token usage estimation from assistant message lengths
+
+## Phase 3: Timeline UI
+
+- [ ] Feed parsed events into go-html for visual session timeline
+- [ ] Colour-code events by type (tool call, assistant message, user message)
+- [ ] Add collapsible detail panels for long tool outputs
+- [ ] Export timeline as standalone HTML file
+
+---
+
+## Workflow
+
+1. Virgil in core/go writes tasks here after research
+2. This repo's dedicated session picks up tasks in phase order
+3. Mark `[x]` when done, note commit hash