v0.4 MIT Claude Code

Live observability
for Claude Code

See every agent, tool call, and token as it happens.
Replay sessions deterministically. Zero instrumentation.

Get Started View on GitHub
Tarsa dashboard showing a live multi-agent graph and timeline for a Claude Code session

Five things no other
tool does together

Zero instrumentation

Hook-based capture. No SDK, no proxy, no MITM layer.

Time-travel replay

Pure reducer over append-only log. Deterministic at any timestamp.

Claude Code native

Understands subagent types, team markers, depth levels, and iteration counts.

Local-first

Single binary, writes to /tmp. Your data never leaves your machine.

Real-time DAG

Live directed-acyclic-graph with depth-grid layout, updated as events arrive.

No SDK. No proxy. No cloud. No setup.

How Tarsa compares

Feature-by-feature breakdown across popular observability tools for AI agents.

Tool Zero-instrument Hook-based Time-travel Claude native Local-only Real-time graph
Tarsa winner
langfuse
agentops
ccusage
claude-trace
OTel
Yes Partial No

Features

Everything you need to understand a multi-agent Claude Code session.

Topology DAG

Directed-acyclic-graph of all agents with depth-grid layout. Color-coded edges, updated live as events stream in.

Timeline Gantt

Parallel-bar grouping with depth indentation shows concurrent agents. Mini-map overview for long sessions.

Replay Scrubber

Drag through history to reconstruct exact agent state at any moment. Deterministic via pure reducer.

Cost Provenance

Per-agent token and cost breakdown. Trace spend back to the exact subagent that incurred it.

Stuck Detection

Agent-type baselines and z-score analysis surface stalled agents. Root-cause hints included.

Session Diff

Side-by-side comparison of two sessions. Identify regressions, improvements, or behavioral drift.

One command.
Running in 30 seconds.

curl -fsSL https://raw.githubusercontent.com/elcronos/tarsa/main/install.sh | sh

macOS · Linux · WSL2 · ~30s install

How it works

A straight pipeline from Claude Code hooks to your browser — no intermediaries.