# Add the LSP tool: codecrafters internal error

**URL:** <https://forum.codecrafters.io/t/add-the-lsp-tool-codecrafters-internal-error/16360>\
**Category:** General\
**Tags:** challenge:claude-code\
**Created:** [November 6, 2026, 3:49pm UTC](https://forum.codecrafters.io/t/add-the-lsp-tool-codecrafters-internal-error/16360 "2026-11-06T15:49:28Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![mikesmithcode](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/mikesmithcode/32/25576_2.png) [@mikesmithcode](https://forum.codecrafters.io/u/mikesmithcode)\
**Post date:** [November 6, 2026, 3:49pm UTC](https://forum.codecrafters.io/t/add-the-lsp-tool-codecrafters-internal-error/16360/1 "2026-11-06T15:49:28Z")

</div>

In the “Add the LSP tool”, first bit of LanguageServer Protocol. If I run locally my solution passes. If I submit to codecrafters the logs show an internal error on codecrafters:

```auto

[compile] Moved ./.codecrafters/run.sh → ./your_program.sh

[compile] Compilation successful.

CodeCrafters internal error. Error validating tester context: tester context does not have test case with slug iy3

```

I assume from the test info that this is something internal to codecrafters setup for this test?

---

<div class="post-metadata">

**Author:** ![yeswanth](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/yeswanth/32/27558_2.png) [@yeswanth](https://forum.codecrafters.io/u/yeswanth)\
**Post date:** [November 6, 2026, 4:00pm UTC](https://forum.codecrafters.io/t/add-the-lsp-tool-codecrafters-internal-error/16360/3 "2026-11-06T16:00:36Z")

</div>

Thanks @mikesmithcode for reporting this. I updated you to the latest tester version.

Please note that the LSP extension is still in early stages of testing, and you are one of the first few people to try it out. Do share any feedback or any issues here.