Errors during completion due to missing key.offset

[Wilfred]

I've started noticing the following in my VS Code logs recently:

sourcekit: [2:handleRequest-after:24.8546] error response (Request Invalid): missing 'key.offset'

2025-07-04 09:11:59.236 [info] [Error - 9:11:59 AM] Request textDocument/completion failed.
2025-07-04 09:11:59.236 [info]   Message: sourcekitd invalid request error response (Request Invalid): missing 'key.offset'
  Code: -32001

I see sourcekit-lsp stopped passing offset in #1937 in favour of line and column, but the sourcekit docs suggest that offset is required: https://github.com/swiftlang/swift/blob/main/tools/SourceKit/docs/Protocol.md#code-completion

Which is correct? Are the protocol docs stale, is this a bug in sourcekit-lsp, or is it an issue with my setup?

[Wilfred]

My local build might be missing #1906 somehow, I'll keep digging.

[bnbarham]

Are the protocol docs stale, is this a bug in sourcekit-lsp, or is it an issue with my setup?

Sort of all three unfortunately:

1. The docs are stale given the new plugin (which takes line and column)
2. You could argue that it's a bug that sourcekit-lsp doesn't support sourcekitd without the plugin - the general expectation is that both are in-sync though
3. I assume you have a new sourcekit-lsp but an old (ie. <=6.1) toolchain/sourcekitd?

[Wilfred]

FWIW my local distribution was missing the plugins, so I had sourcekit-lsp but no libSwiftSourceKitClientPlugin.so. Thanks for the pointers, this is now fixed :)

[Wilfred]

I would close this, but looks like I don't have power to close my own issues?