LSP Servers

OpenCode can integrate with Language Server Protocol (LSP) servers to use diagnostics as feedback for the agent.

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Built-in

OpenCode comes with several built-in LSP servers for popular languages:

LSP Server	Extensions	Requirements
astro	.astro	Auto-installs for Astro projects
bash	.sh, .bash, .zsh, .ksh	Auto-installs bash-language-server
clangd	.c, .cpp, .cc, .cxx, .c++, .h, .hpp, .hh, .hxx, .h++	Auto-installs for C/C++ projects
csharp	.cs, .csx	.NET SDK installed
clojure-lsp	.clj, .cljs, .cljc, .edn	clojure-lsp command available
dart	.dart	dart command available
deno	.ts, .tsx, .js, .jsx, .mjs	deno command available (auto-detects deno.json/deno.jsonc)
elixir-ls	.ex, .exs	elixir command available
eslint	.ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts, .vue	eslint dependency in project
fsharp	.fs, .fsi, .fsx, .fsscript	.NET SDK installed
gleam	.gleam	gleam command available
gopls	.go	go command available
hls	.hs, .lhs	haskell-language-server-wrapper command available
jdtls	.java	Java SDK (version 21+) installed
julials	.jl	julia and LanguageServer.jl installed
kotlin-ls	.kt, .kts	Auto-installs for Kotlin projects
lua-ls	.lua	Auto-installs for Lua projects
nixd	.nix	nixd command available
ocaml-lsp	.ml, .mli	ocamllsp command available
oxlint	.ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts, .vue, .astro, .svelte	oxlint dependency in project
php intelephense	.php	Auto-installs for PHP projects
prisma	.prisma	prisma command available
pyright	.py, .pyi	pyright dependency installed
razor	.razor, .cshtml	.NET SDK and VS Code C# extension installed
ruby-lsp (rubocop)	.rb, .rake, .gemspec, .ru	ruby and gem commands available
rust	.rs	rust-analyzer command available
sourcekit-lsp	.swift, .objc, .objcpp	swift installed (xcode on macOS)
svelte	.svelte	Auto-installs for Svelte projects
terraform	.tf, .tfvars	Auto-installs from GitHub releases
tinymist	.typ, .typc	Auto-installs from GitHub releases
typescript	.ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts	typescript dependency in project
vue	.vue	Auto-installs for Vue projects
yaml-ls	.yaml, .yml	Auto-installs Red Hat yaml-language-server
zls	.zig, .zon	zig command available

LSP is disabled by default. When enabled, servers start when one of the above file extensions is detected and the requirements are met.

Note

You can disable automatic LSP server downloads by setting the OPENCODE_DISABLE_LSP_DOWNLOAD environment variable to true.

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How It Works

When LSP is enabled and opencode opens a file, it:

1. Checks the file extension against all enabled LSP servers.
2. Starts the appropriate LSP server if not already running.

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Best Practices

LSP can help the agent find and fix issues by providing diagnostics from language servers. This is useful in some projects, but it is not always a net positive.

Language servers can get out of sync, use significant memory, vary by version or project, and slow down agent workflows. In many projects it is better to have the agent run lint, typecheck, or other diagnostic CLI tools directly, so errors are fed back into the agent loop without those tradeoffs. Document those commands in instruction files such as AGENTS.md or skills so the agent knows what to run. Enable LSP when your project benefits from additional language-server feedback.

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Configure

You can enable and customize LSP servers through the lsp section in your opencode config.

To enable all built-in LSP servers, set lsp to true.

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "lsp": true
}

Use an object to keep built-ins enabled while configuring overrides or custom servers.

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "lsp": {}
}

Each configured LSP server entry supports the following:

Server entries need command unless they only disable a server.

Property	Type	Description
disabled	boolean	Set this to true to disable the LSP server
command	string[]	The command to start the LSP server
extensions	string[]	File extensions this LSP server should handle
env	object	Environment variables to set when starting server
initialization	object	Initialization options to send to the LSP server

Let’s look at some examples.

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Environment variables

Use the env property to set environment variables when starting the LSP server:

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "lsp": {
    "rust": {
      "command": ["rust-analyzer"],
      "env": {
        "RUST_LOG": "debug"
      }
    }
  }
}

---

Initialization options

Use the initialization property to pass initialization options to the LSP server. These are server-specific settings sent during the LSP initialize request:

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "lsp": {
    "custom-lsp": {
      "command": ["custom-lsp-server", "--stdio"],
      "extensions": [".custom"],
      "initialization": {
        "preferences": {
          "importModuleSpecifierPreference": "relative"
        }
      }
    }
  }
}

Note

Initialization options vary by LSP server. Check your LSP server’s documentation for available options.

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Disabling LSP servers

If lsp is omitted, all LSP servers are disabled. To disable all LSP servers after another config enabled them, set lsp to false:

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "lsp": false
}

To disable a specific LSP server, set disabled to true:

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "lsp": {
    "typescript": {
      "disabled": true
    }
  }
}

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Custom LSP servers

You can add custom LSP servers by specifying the command and file extensions:

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "lsp": {
    "custom-lsp": {
      "command": ["custom-lsp-server", "--stdio"],
      "extensions": [".custom"]
    }
  }
}

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Additional Information

PHP Intelephense

PHP Intelephense offers premium features through a license key. You can provide a license key by placing (only) the key in a text file at:

• On macOS/Linux: $HOME/intelephense/license.txt
• On Windows: %USERPROFILE%/intelephense/license.txt

The file should contain only the license key with no additional content.