---
type: entity
subtype: tool
title: "Sentry"
description: "Application monitoring platform (the video sponsor) that makes it easy to add tracing, logs, and error alerting to MCP servers in production."
resource: "https://sentry.io"
tags: [observability, application-monitoring, mcp]
videos: [claude-codes-real-purpose-its-bigger-than-you-think, build-and-ship-any-mcp-server-in-minutes-full-guide]
created: 2026-07-21
updated: 2026-07-21
---

# Sentry

Sentry is the application-monitoring platform Cole uses to put production tracing, logging, and error alerting around backend infrastructure, and especially around [MCP](../../concepts/mcp.md) servers. He values it because it closes an otherwise blind gap: "You need this kind of tracing and that's what Sentry gives us" [0:16:14]. Where he uses [Langfuse](./langfuse.md) to monitor the *agents*, Sentry watches the surrounding application and RAG pipelines, together providing [Agent Observability](../../concepts/agent-observability.md) across the whole stack.

## What it is

Sentry turns each interaction with a system into an inspectable trace. Describing his setup for a deployed MCP server, Cole says he has "this amazing dashboard where we have all these traces. So every single time we interact with Claude code, it's a single trace that we can click into" [0:15:40]. Beyond tracing it surfaces logs and error alerts, so failures in production are caught rather than silently swallowed.

## How Cole uses it

Cole's headline claim is that Sentry is uniquely good at the MCP use case: "Sentry really is the best platform. It's really the only one that I know of that makes it super easy to integrate application monitoring with MCP server specifically" [0:20:44]. In his build-and-ship walkthrough he wires it into a Cloudflare Workers deployment, and the integration is concrete: "You just want to search for Cloudflare workers JavaScript. That's the type that you create for Sentry. You'll get that DSN which you use as your environment variable" [0:21:16]. He splits responsibilities cleanly across his stack: "I use Langfuse as my platform more specifically to monitor agents, but then my whole backend infrastructure and rag pipelines, Sentry is a great option." Sentry was also the sponsor of the video where he demonstrates it, which he discloses.

## Realizes

- [Agent Observability](../../concepts/agent-observability.md) - Instrumenting agents with tracing, logging, and cost/token metrics so you can see and debug what they actually did.

## Works with

- [Model Context Protocol (MCP)](../../concepts/mcp.md) - An open protocol for packaging tools, data, and RAG capabilities as servers that any AI coding assistant or agent can connect to and call with a standard interface.

## Contrasts with

- [Langfuse](./langfuse.md) - The platform Cole uses specifically to monitor AI agents in production, distinct from Sentry which he uses for backend/RAG infrastructure.
- [Logfire](./logfire.md) - Observability tool by the Pydantic team that instruments Pydantic AI agents to send traces, token usage, and cost as telemetry for local and production debugging.

## Related

- [AI Coding Harness](../../concepts/ai-coding-harness.md) - The surrounding scaffolding (prompts, tools, rules, validation) that turns a raw model into a reliable coding system.
- [Agentic Coding](../../concepts/agentic-coding.md) - Letting an AI agent drive software development end-to-end, from planning through implementation and validation, with human steering.
- [Second Brain](../../concepts/second-brain.md) - A personal, always-on AI system that captures, recalls, and acts on your knowledge and daily context.
- [Provider Independence](../../concepts/provider-independence.md) - Architecting agents so the underlying model, framework, or client can be swapped without a rewrite, avoiding lock-in through low-level abstractions.
- [Claude Code](./claude-code.md) - Anthropic's terminal-based agentic coding assistant that is the subject of this complete-guide walkthrough.

## Sources

- [Build and Ship Any MCP Server in MINUTES (Full Guide)](../../sources/build-and-ship-any-mcp-server-in-minutes-full-guide.md) - "[0:20:44] Sentry really is the best platform. It's really the only one that I know of that makes it super easy to integrate application monitoring with MCP server specifically."
- [Claude Code's Real Purpose (It's Bigger Than You Think)](../../sources/claude-codes-real-purpose-its-bigger-than-you-think.md) - "[0:16:14] You need this kind of tracing and that's what Sentry gives us."
