Use language servers, tools that understand code structure, to check errors, locate definitions, and find references in Codex. Check whether a symbol can be renamed and apply the rename across the workspace.
Use when Codex needs language-server diagnostics, definitions, references, symbols, or rename safety checks in the current workspace.
Review the instructions the agent will receive before you install.
Call lsp MCP tools through the tool interface; lsp.*/mcp__lsp__* are tool-call names, not shell commands.
lsp.status: list configured, installed, missing, disabled, and active language servers.lsp.diagnostics: check one file or directory for LSP diagnostics. Prefer severity: "error" after edits.lsp.goto_definition: locate a symbol definition from file, line, and character.lsp.find_references: find usages of a symbol across the workspace.lsp.symbols: inspect document symbols or search workspace symbols.lsp.prepare_rename: check whether a rename is valid at a position.lsp.rename: apply a language-server workspace edit for a rename.Project config lives at .codex/lsp-client.json; user config lives at ~/.codex/lsp-client.json.
{
"lsp": {
"typescript": {
"command": ["typescript-language-server", "--stdio"],
"extensions": [".ts", ".tsx", ".js", ".jsx"]
}
}
}
Use lsp.status first when diagnostics report a missing language server.
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