bar-observatory
Active·★ 24·MIT·Updated 2026-08-27
BAR Observatory is an open-source, local-only audit tool for Claude Code sessions, acting as a flight recorder to capture and report every agent action. It provides deterministic reports in JSON, HTML, and Markdown, enabling verification of agent performance without relying on its self-summary or external services.
#Agentic AI#LLM Observability#Audit Tool#Session Analysis#Deterministic Reports#Claude Code#Local-only#Rust
01
Features
01Capture and report every agent tool call, task, and sub-agent dispatch.
02Generate deterministic reports in JSON, HTML, and Markdown, without an LLM in the render path.
03Identify and surface all errors and rework hotspots from agent sessions.
04Operate locally with zero network egress for the primary path, ensuring data privacy.
02
Compatibility
Rust
Language
Verified via docs
Claude Code
Integration
Verified via docs
Windows
OS
Verified via docs
MacOS
OS
Verified via docs
Linux
OS
Verified via docs
03
Quick start
1
$ cargo install bar-hook bar-mcp bar-observatory
04
Use cases
↳Audit and verify what an AI agent actually did in a session, beyond its self-summary.
↳Provide a reproducible artifact (e.g., for PRs, reviews, compliance) of AI-assisted work.
↳Debug multi-agent runs by surfacing hidden failures and rework efforts.
↳Enable AI agents to audit their own past sessions for self-improvement loops.
05
Alternatives
preflight★ 65
Observability for AI coding assistants — cost tracking, efficiency scoring, and anti-pattern detection for Claude Code, Cursor, Copilot, and more. Local-first; New Relic optional.
codex-usage-tracker★ 196
Local-first MCP tools and dashboard for investigating Codex token usage, credits, costs, caching, and thread patterns.
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