xai-org/grok-build · error

No LSP server configured for {}

Error message

No LSP server configured for {}

What it means

After validating the input, the LSP manager resolves which language-server client handles the given file via `client_for_file_mut` (based on file extension / configured servers). If no LSP server is registered for the file's type, the tool returns 'No LSP server configured for {path}'. The environment lacks a language server mapping for that file, so no position query can be served.

Source

Thrown at crates/codegen/xai-grok-tools/src/implementations/lsp/manager.rs:540

        let err = |msg: String| LspToolResult {
            text: msg,
            is_error: true,
        };

        let result = match input.operation {
            LspOperation::GoToDefinition
            | LspOperation::FindReferences
            | LspOperation::Hover
            | LspOperation::GoToImplementation => {
                let (Some(fp), Some(line), Some(col)) =
                    (&input.file_path, input.line, input.character)
                else {
                    return err("Required: file_path (string), line (int), character (int).".into());
                };
                let path = PathBuf::from(fp);
                let Some(client) = self.client_for_file_mut(&path) else {
                    return err(format!("No LSP server configured for {}", path.display()));
                };
                match input.operation {
                    LspOperation::GoToDefinition => client
                        .goto_definition(&path, line, col)
                        .await
                        .map(|l| format_locations_labeled("Definition", &l)),
                    LspOperation::FindReferences => client
                        .goto_references(&path, line, col)
                        .await
                        .map(|l| format_locations_labeled("References", &l)),
                    LspOperation::GoToImplementation => client
                        .goto_implementation(&path, line, col)
                        .await
                        .map(|l| format_locations_labeled("Implementations", &l)),
                    LspOperation::Hover => client.hover(&path, line, col).await.map(|opt| {
                        opt.unwrap_or_else(|| "No hover information available.".to_string())
                    }),
                    _ => unreachable!(),

View on GitHub (pinned to bc7f02eddd)

Solutions

  1. Configure an LSP server for the file's language (register rust-analyzer/pyright/gopls etc. for that extension) in the shell/tool LSP settings.
  2. Verify the server binary is installed and on PATH so the client registers successfully at startup.
  3. Check the file path/extension is what you intend (typos or wrong file targeted).
  4. Confirm the server started healthily (logs) — some managers skip clients that failed to initialize.

Example fix

// before: no server configured for .go files
await lspTool({ operation: "hover", file_path: "main.go", line: 0, character: 6 });
// after: register gopls for Go first
lspConfig.servers.push({ language: "go", extensions: [".go"], command: "gopls" });
Defensive patterns

Strategy: fallback

Validate before calling

// check a server is configured for the file's extension before calling
const ext = path.extname(input.file_path);
const supported = lspConfig.servers.some(s => s.extensions.includes(ext));
if (!supported) console.warn(`no LSP server for ${ext}; expect 'No LSP server configured'`);

Type guard

fn server_configured_for(ext: &str, cfg: &LspConfig) -> bool {
    cfg.servers.iter().any(|s| s.extensions.iter().any(|e| e == ext))
}

Try / catch

try {
  const locs = await lspTool(input);
} catch (e) {
  if (String(e.message).startsWith("No LSP server configured for")) {
    // fall back to text-based search instead of LSP
    return grepFallback(input.file_path, input.query);
  } else { throw e; }
}

Prevention

When it happens

Trigger: Calling a position-based LSP operation (GoToDefinition, FindReferences, Hover, GoToImplementation) on a file whose extension has no configured server — e.g. hovering a .txt/.md file, a file type with no rust-analyzer/pyright/gopls mapping, or running before any LSP server was registered in the manager.

Common situations: Querying files of an unsupported language in a polyglot repo; server binary not installed so registration was skipped at startup; config only maps common languages (rust/ts/python) but the project includes others; operating on generated or vendored files with unusual extensions.

Related errors

AI-assisted analysis of xai-org/grok-build@bc7f02eddd (2026-08-31). Data as JSON: /api/errors/42ef96f394eaa415. Report an issue: GitHub.