Lookspan
Local-first observability for AI agents — one command
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Jonathan Martín

Lookspan - Local-first observability for AI agents — one command

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Lookspan is local-first observability for AI agents. npx lookspan runs a dashboard on your machine — traces with a timeline/waterfall, a readable transcript per LLM call, cost & latency, plus replay, LLM-as-judge and datasets. MCP-native, OpenAI/Anthropic drop-ins, OpenTelemetry. Your prompts never leave your box. MIT.

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Jonathan Martín
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Hi PH 👋 I'm Jonathan, I built Lookspan. Every LLM observability tool I tried was SaaS — account, cloud, per-event pricing — before I could see a single trace. Lookspan is the opposite: npx lookspan → local dashboard, data stays on your machine, $0 infra. Beyond tracing it closes the loop: replay a prompt against another model and diff cost/latency/output, score with an LLM-judge, run datasets in batch. MCP-native, one-line OpenAI/Anthropic drop-ins, OTel receiver. MIT & early — I'd love feedback on what's missing. Thanks for checking it out!