Using an MCP Server to Fix Tests that Failed on CI

August 8, 2025
Dan Manges
Dan Manges
Using an MCP Server to Fix Tests that Failed on CI

We just shipped an MCP Server via the RWX CLI. Upgrade to at least version 1.11, and it'll be available via rwx mcp serve.

/bin/bash
$ brew upgrade rwx-cloud/tap/rwx


$ rwx --version
rwx version v1.11.0

MCP Tool to Get Test Failures

With RWX, test results are a semantic output. Rather than having to scroll through logs, you can easily see which tests failed in the UI. And now, AI can easily see which tests failed via an MCP tool.

Claude, fix the tests that failed in this CI run

Add RWX to Claude's MCP configuration:

/bin/bash
$ claude mcp add rwx -- rwx mcp serve

You can then see it in the list of servers:

/bin/bash
$ claude mcp list


Checking MCP server health...


rwx: rwx mcp serve - ✓ Connected

Here's a snippet from a Claude session that gets a list of tests that failed and fixes them.

claude
> fix the test failures from this run:
  https://cloud.rwx.com/mint/rwx/runs/df4781e384584db98c3274a84f2bcfc2


⏺ I'll help you fix the test failures from that RWX run. Let me first
  get the details of the failed tests.


⏺ rwx - get_run_test_failures (MCP)(run_urls:
                                   ["https://cloud.rwx.com/mint/rwx/runs
                                   /df4781e384584db98c3274a84f2bcfc2"])
  ⎿  Failed tests:


     - src/calculator.test.ts
     … +2 lines (ctrl+r to expand)


⏺ Now let me examine the test file and the implementation to understand
  what's failing.

Demo

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