Sentry

Sentry is an application monitoring platform that captures errors and performance issues in applications. It is added to an application through an SDK, without separate agents to install.

Seer, Sentry’s debugging agent and code reviewer, helps find the root cause of issues and catch critical problems before code is merged. Agent tracing monitors AI agents for unexpected outputs, bad tool calls, cost and performance. Sentry integrates with GitHub, Slack, Jira and Linear, and its MCP server gives coding agents context on production issues.

Sentry is offered as a hosted service with a free plan; its source code is published on GitHub (release 26.10.0 in October 2026).