diff --git a/assets/oh-my-opencode.schema.json b/assets/oh-my-opencode.schema.json
index b6d1505..b5f68ab 100644
--- a/assets/oh-my-opencode.schema.json
+++ b/assets/oh-my-opencode.schema.json
@@ -1220,6 +1220,14 @@
         },
         "auto_resume": {
           "type": "boolean"
+        },
+        "preemptive_compaction": {
+          "type": "boolean"
+        },
+        "preemptive_compaction_threshold": {
+          "type": "number",
+          "minimum": 0.5,
+          "maximum": 0.95
         }
       }
     },
diff --git a/src/tools/lsp/config.ts b/src/tools/lsp/config.ts
index 974d092..7bea891 100644
--- a/src/tools/lsp/config.ts
+++ b/src/tools/lsp/config.ts
@@ -147,11 +147,31 @@ export function isServerInstalled(command: string[]): boolean {
   if (command.length === 0) return false
 
   const cmd = command[0]
+  const isWindows = process.platform === "win32"
+  const ext = isWindows ? ".exe" : ""
+
   const pathEnv = process.env.PATH || ""
-  const paths = pathEnv.split(":")
+  const pathSeparator = isWindows ? ";" : ":"
+  const paths = pathEnv.split(pathSeparator)
 
   for (const p of paths) {
-    if (existsSync(join(p, cmd))) {
+    if (existsSync(join(p, cmd)) || existsSync(join(p, cmd + ext))) {
+      return true
+    }
+  }
+
+  const cwd = process.cwd()
+  const additionalPaths = [
+    join(cwd, "node_modules", ".bin", cmd),
+    join(cwd, "node_modules", ".bin", cmd + ext),
+    join(homedir(), ".config", "opencode", "bin", cmd),
+    join(homedir(), ".config", "opencode", "bin", cmd + ext),
+    join(homedir(), ".config", "opencode", "node_modules", ".bin", cmd),
+    join(homedir(), ".config", "opencode", "node_modules", ".bin", cmd + ext),
+  ]
+
+  for (const p of additionalPaths) {
+    if (existsSync(p)) {
       return true
     }
   }
diff --git a/src/tools/lsp/constants.ts b/src/tools/lsp/constants.ts
index fe92119..0e4ca1a 100644
--- a/src/tools/lsp/constants.ts
+++ b/src/tools/lsp/constants.ts
@@ -40,6 +40,8 @@ export const DEFAULT_MAX_REFERENCES = 200
 export const DEFAULT_MAX_SYMBOLS = 200
 export const DEFAULT_MAX_DIAGNOSTICS = 200
 
+// Synced with OpenCode's server.ts
+// https://github.com/sst/opencode/blob/main/packages/opencode/src/lsp/server.ts
 export const BUILTIN_SERVERS: Record<string, Omit<LSPServerConfig, "id">> = {
   typescript: {
     command: ["typescript-language-server", "--stdio"],
@@ -57,6 +59,17 @@ export const BUILTIN_SERVERS: Record<string, Omit<LSPServerConfig, "id">> = {
     command: ["vscode-eslint-language-server", "--stdio"],
     extensions: [".ts", ".tsx", ".js", ".jsx", ".mjs", ".cjs", ".mts", ".cts", ".vue"],
   },
+  oxlint: {
+    command: ["oxlint", "--lsp"],
+    extensions: [".ts", ".tsx", ".js", ".jsx", ".mjs", ".cjs", ".mts", ".cts", ".vue", ".astro", ".svelte"],
+  },
+  biome: {
+    command: ["biome", "lsp-proxy", "--stdio"],
+    extensions: [
+      ".ts", ".tsx", ".js", ".jsx", ".mjs", ".cjs", ".mts", ".cts",
+      ".json", ".jsonc", ".vue", ".astro", ".svelte", ".css", ".graphql", ".gql", ".html",
+    ],
+  },
   gopls: {
     command: ["gopls"],
     extensions: [".go"],
@@ -73,6 +86,10 @@ export const BUILTIN_SERVERS: Record<string, Omit<LSPServerConfig, "id">> = {
     command: ["pyright-langserver", "--stdio"],
     extensions: [".py", ".pyi"],
   },
+  ty: {
+    command: ["ty", "server"],
+    extensions: [".py", ".pyi"],
+  },
   ruff: {
     command: ["ruff", "server"],
     extensions: [".py", ".pyi"],
@@ -89,6 +106,10 @@ export const BUILTIN_SERVERS: Record<string, Omit<LSPServerConfig, "id">> = {
     command: ["csharp-ls"],
     extensions: [".cs"],
   },
+  fsharp: {
+    command: ["fsautocomplete"],
+    extensions: [".fs", ".fsi", ".fsx", ".fsscript"],
+  },
   "sourcekit-lsp": {
     command: ["sourcekit-lsp"],
     extensions: [".swift", ".objc", ".objcpp"],
@@ -133,26 +154,128 @@ export const BUILTIN_SERVERS: Record<string, Omit<LSPServerConfig, "id">> = {
     command: ["dart", "language-server", "--lsp"],
     extensions: [".dart"],
   },
+  "terraform-ls": {
+    command: ["terraform-ls", "serve"],
+    extensions: [".tf", ".tfvars"],
+  },
 }
 
+// Synced with OpenCode's language.ts
+// https://github.com/sst/opencode/blob/main/packages/opencode/src/lsp/language.ts
 export const EXT_TO_LANG: Record<string, string> = {
+  ".abap": "abap",
+  ".bat": "bat",
+  ".bib": "bibtex",
+  ".bibtex": "bibtex",
+  ".clj": "clojure",
+  ".cljs": "clojure",
+  ".cljc": "clojure",
+  ".edn": "clojure",
+  ".coffee": "coffeescript",
+  ".c": "c",
+  ".cpp": "cpp",
+  ".cxx": "cpp",
+  ".cc": "cpp",
+  ".c++": "cpp",
+  ".cs": "csharp",
+  ".css": "css",
+  ".d": "d",
+  ".pas": "pascal",
+  ".pascal": "pascal",
+  ".diff": "diff",
+  ".patch": "diff",
+  ".dart": "dart",
+  ".dockerfile": "dockerfile",
+  ".ex": "elixir",
+  ".exs": "elixir",
+  ".erl": "erlang",
+  ".hrl": "erlang",
+  ".fs": "fsharp",
+  ".fsi": "fsharp",
+  ".fsx": "fsharp",
+  ".fsscript": "fsharp",
+  ".gitcommit": "git-commit",
+  ".gitrebase": "git-rebase",
+  ".go": "go",
+  ".groovy": "groovy",
+  ".gleam": "gleam",
+  ".hbs": "handlebars",
+  ".handlebars": "handlebars",
+  ".hs": "haskell",
+  ".html": "html",
+  ".htm": "html",
+  ".ini": "ini",
+  ".java": "java",
+  ".js": "javascript",
+  ".jsx": "javascriptreact",
+  ".json": "json",
+  ".jsonc": "jsonc",
+  ".tex": "latex",
+  ".latex": "latex",
+  ".less": "less",
+  ".lua": "lua",
+  ".makefile": "makefile",
+  makefile: "makefile",
+  ".md": "markdown",
+  ".markdown": "markdown",
+  ".m": "objective-c",
+  ".mm": "objective-cpp",
+  ".pl": "perl",
+  ".pm": "perl",
+  ".pm6": "perl6",
+  ".php": "php",
+  ".ps1": "powershell",
+  ".psm1": "powershell",
+  ".pug": "jade",
+  ".jade": "jade",
   ".py": "python",
   ".pyi": "python",
+  ".r": "r",
+  ".cshtml": "razor",
+  ".razor": "razor",
+  ".rb": "ruby",
+  ".rake": "ruby",
+  ".gemspec": "ruby",
+  ".ru": "ruby",
+  ".erb": "erb",
+  ".html.erb": "erb",
+  ".js.erb": "erb",
+  ".css.erb": "erb",
+  ".json.erb": "erb",
+  ".rs": "rust",
+  ".scss": "scss",
+  ".sass": "sass",
+  ".scala": "scala",
+  ".shader": "shaderlab",
+  ".sh": "shellscript",
+  ".bash": "shellscript",
+  ".zsh": "shellscript",
+  ".ksh": "shellscript",
+  ".sql": "sql",
+  ".svelte": "svelte",
+  ".swift": "swift",
   ".ts": "typescript",
   ".tsx": "typescriptreact",
   ".mts": "typescript",
   ".cts": "typescript",
-  ".js": "javascript",
-  ".jsx": "javascriptreact",
+  ".mtsx": "typescriptreact",
+  ".ctsx": "typescriptreact",
+  ".xml": "xml",
+  ".xsl": "xsl",
+  ".yaml": "yaml",
+  ".yml": "yaml",
   ".mjs": "javascript",
   ".cjs": "javascript",
-  ".go": "go",
-  ".rs": "rust",
-  ".c": "c",
-  ".cpp": "cpp",
-  ".cc": "cpp",
-  ".cxx": "cpp",
-  ".c++": "cpp",
+  ".vue": "vue",
+  ".zig": "zig",
+  ".zon": "zig",
+  ".astro": "astro",
+  ".ml": "ocaml",
+  ".mli": "ocaml",
+  ".tf": "terraform",
+  ".tfvars": "terraform-vars",
+  ".hcl": "hcl",
+  // Additional extensions not in OpenCode
   ".h": "c",
   ".hpp": "cpp",
   ".hh": "cpp",
@@ -160,37 +283,7 @@ export const EXT_TO_LANG: Record<string, string> = {
   ".h++": "cpp",
   ".objc": "objective-c",
   ".objcpp": "objective-cpp",
-  ".java": "java",
-  ".rb": "ruby",
-  ".rake": "ruby",
-  ".gemspec": "ruby",
-  ".ru": "ruby",
-  ".lua": "lua",
-  ".swift": "swift",
-  ".cs": "csharp",
-  ".php": "php",
-  ".dart": "dart",
-  ".ex": "elixir",
-  ".exs": "elixir",
-  ".zig": "zig",
-  ".zon": "zig",
-  ".vue": "vue",
-  ".svelte": "svelte",
-  ".astro": "astro",
-  ".yaml": "yaml",
-  ".yml": "yaml",
-  ".json": "json",
-  ".jsonc": "jsonc",
-  ".html": "html",
-  ".htm": "html",
-  ".css": "css",
-  ".scss": "scss",
-  ".less": "less",
-  ".sh": "shellscript",
-  ".bash": "shellscript",
-  ".zsh": "shellscript",
   ".fish": "fish",
-  ".md": "markdown",
-  ".tf": "terraform",
-  ".tfvars": "terraform",
+  ".graphql": "graphql",
+  ".gql": "graphql",
 }