# Debugging your application with MCP

These are common situations where it's faster to ask your connected assistant than to click through the dashboard yourself.

## "My deploy failed"

Ask: *"Why did my last deploy fail?"*

The assistant reaches for `diagnose_deploy_failure`: a single tool that chains together build history, the failing build's logs, every resource's status, self-healing history, runtime logs, missing environment variables, missing Dockerfile build arguments, and (if you give it a local repo path) an actual local Docker build test. It comes back with a failure category, a list of concrete issues with evidence, and a plain-language verdict, instead of you opening five different dashboard tabs.

## "My app is down or crashing"

Ask: *"Is my server crashing? What's going on with it?"*

The assistant pulls runtime logs from the live container and cross-checks self-healing history. Repeated restart attempts that never reach `HEALED` are flagged as a suspected (not confirmed) sign the instance isn't responding, enough to point you in the right direction.

## "My build keeps failing and I don't know why"

Ask: *"Test the generated Dockerfile against my local repo."*

This runs a real `docker build` against your actual checked-out code (requires the MCP server running on your own machine, with Docker installed). It's the most reliable way to catch a Dockerfile issue, because it reproduces the real build instead of relying on stored metadata.

## "A value looks wrong but I can't tell what's configured"

Ask: *"Does the `STRIPE_SECRET_KEY` I have locally match what's configured on Kuberns?"*

The assistant fetches a SHA-256 hash of the configured value and compares it against a hash of your local value, never exposing either value in plaintext. A mismatch tells you there's a stale value, a typo, or extra whitespace, even though it can't show you the exact difference.

## "My custom domain won't go live"

Ask: *"Why is my custom domain stuck?"*

The assistant checks the domain's status and `process_status`, telling you whether it's stuck on CNAME verification, A-record verification, SSL certificate generation, or final activation.

## "I can't start my server"

Ask: *"Why won't my server start?"*

Usually a credits problem. The assistant checks whether you have enough available credits for that specific resource, and reports the required vs. available amount.