Observability for MCP tool calls. Reconstruct sessions, debug failures, optimize costs.
You shipped an MCP. Works in dev. But in production, agents make strange decisions, call wrong tools, fail silently. Users report issues you cannot explain. Your logs show nothing. No trace of what the agent thought, why it chose each tool, or where logic broke.
You are debugging blind. Every debugging cycle costs time, money, and trust.
Session Lens wraps your MCP in three lines of code. Every session is reconstructed with full context. You see what the agent saw, why it decided, where it failed. Real observability for agentic systems.
No more guessing. No more darkness. Clarity on every decision your agent made.
Replay every session as the agent saw it. View the original prompt, every tool call, returned results, agent reasoning, and final response. Drill into failures with full call-chain context. Understand what went wrong without guessing.
Automatically group similar sessions by behavior pattern. Identify your MCP's most-used paths. Spot dead code no user exercises. Detect anomalies before they cascade into production failures. Surface trends in how agents interact with your tools.
Track cost of every tool call, every session, every user. Identify expensive code paths before overspend happens. Optimize on real data, not hunches. Control budget to the basis point. See cost trends over time and catch regressions instantly.
Measure session latency, tool-call latency, token usage, success rates. Catch regressions before users hit them. Benchmark performance improvements. Make data-driven decisions on MCP design, tool priorities, and handler optimization.
Add our SDK to your MCP. TypeScript, Python, or Go. Standard package install.
Wrap your tool handler with one line. Call session_start() and session_end(). Zero changes to your logic.
Log in to your dashboard. See every session reconstructed. Begin debugging with real data, not logs.
Used by teams building with Claude SDK, Anthropic API, ProxyBox, and custom MCPs.
Up to 10k sessions/month
Up to 100k sessions/month
Unlimited sessions
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This is not a purchase and there is no card field. It puts your address, this product, and whatever you write below in front of a person, and you get a written answer about what finishing it, or handing it over for you to run yourself, would actually take.