Agent Trace Viewer
Drop a coding-agent trace export in the browser and read it as a timeline: user messages, model replies, thinking, tool calls with their input and output, token usage and cost. Files are parsed locally and never uploaded.
Supported formats
- Claude Code session JSONL (
~/.claude/projects/**/*.jsonl) - Claude Agent SDK output (
claude -p --output-format=stream-json) - Codex rollout JSONL (
~/.codex/sessions/**/rollout-*.jsonl) - OpenCode session export (
ses_*.json) - Pi coding agent sessions (
~/.pi/agent/sessions/**/*.jsonl) andpi --jsonoutput - Gemini CLI and Qwen Code checkpoints (
~/.gemini/tmp/**/checkpoint-*.json) - Goose sessions (
~/.local/share/goose/sessions/*.jsonl) - Cline and Roo Code tasks (
ui_messages.json) - OpenHands trajectories and SWE-agent
.trajfiles - OpenTelemetry GenAI spans exported as OTLP JSON
- Generic OpenAI / Anthropic
messagesarrays