inspect MCP tool for external dependencies

[jpetuchovas]

For context, I am trying to use the new MCP tool inspect. The project I am using it in uses Bazel as a build tool. I can successfully retrieve members of a class that belongs to the project; however, when trying to retrieve members of a class from an external dependency (for example, com.typesafe.scalalogging.Logger), I get an empty response:

{ content: [ { type: 'text', text: '' } ], isError: false }

Triggering textDocument/completion requests for the same external dependency class (or an instance of the class) does produce completions.

I just wanted to ask: does inspect tool support external dependencies and/or Bazel build tool?

[tgodzik]

It should work, but we haven't really tested it in Bazel CC @kasiaMarek

[jpetuchovas]

@tgodzik Do you have an idea why textDocument/completion requests could work but calling inspect does not?

[kasiaMarek]

I'm not sure why that would be the case. I would recommend switching to the SNAPSHOT version of Metals, there was a fix for inspect for Scala 3. You can also enable debug in Metals (by adding -Dmetals.loglevel=debug to server properties), Metals will log the code that was used for getting completions for inspect:

metals/metals/src/main/scala/scala/meta/internal/metals/mcp/McpInspectProvider.scala

Line 130 in f4f4439

s"querying for completions for ${symbol.symbol}:\n${compilerParams.text}"

You can then manually check if you're getting a completion for this in Metals. Also it's always a good idea to see in the logs if there in no information about an error raport created when inspect is called.

I'll also test inspect in an example Bazel project to make sure it's not an issue with build targets. If you have any reproduction of the issue, that would also be vary useful. 😄

[jpetuchovas]

Thanks for the reply! Here is a project for which inspect returns no members for com.typesafe.scalalogging.Logger: https://github.com/jpetuchovas/specs2-example-bazel

[kasiaMarek]

I created an issue out of this here. It's the symbol search that fails here.