diff --git a/analysis/src/BuildSystem.ml b/analysis/src/BuildSystem.ml
index 02dff9bde..342acfb93 100644
--- a/analysis/src/BuildSystem.ml
+++ b/analysis/src/BuildSystem.ml
@@ -6,15 +6,18 @@ let namespacedName namespace name =
 let ( /+ ) = Filename.concat
 
 let getBsPlatformDir rootPath =
-  let result =
-    ModuleResolution.resolveNodeModulePath ~startPath:rootPath "rescript"
-  in
-  match result with
-  | Some path -> Some path
-  | None ->
-    let message = "rescript could not be found" in
-    Log.log message;
-    None
+  match !Cfg.isDocGenFromCompiler with
+  | false -> (
+    let result =
+      ModuleResolution.resolveNodeModulePath ~startPath:rootPath "rescript"
+    in
+    match result with
+    | Some path -> Some path
+    | None ->
+      let message = "rescript could not be found" in
+      Log.log message;
+      None)
+  | true -> Some rootPath
 
 let getLibBs root = Files.ifExists (root /+ "lib" /+ "bs")
 
diff --git a/analysis/src/Cfg.ml b/analysis/src/Cfg.ml
index 38b3e9aa7..777d76a97 100644
--- a/analysis/src/Cfg.ml
+++ b/analysis/src/Cfg.ml
@@ -1,3 +1,5 @@
 let supportsSnippets = ref false
 
 let debugFollowCtxPath = ref false
+
+let isDocGenFromCompiler = ref false
diff --git a/analysis/src/Cli.ml b/analysis/src/Cli.ml
index a96adbed5..dcb86bdd6 100644
--- a/analysis/src/Cli.ml
+++ b/analysis/src/Cli.ml
@@ -143,7 +143,13 @@ let main () =
       ~pos:(int_of_string line_start, int_of_string line_end)
       ~maxLength ~debug
   | [_; "codeLens"; path] -> Commands.codeLens ~path ~debug
-  | [_; "extractDocs"; path] -> DocExtraction.extractDocs ~path ~debug
+  | [_; "extractDocs"; path] ->
+
+    let () = match Sys.getenv_opt "FROM_COMPILER" with
+    | Some("true") -> Cfg.isDocGenFromCompiler := true
+    | _ -> () in
+
+    DocExtraction.extractDocs ~path ~debug
   | [_; "codeAction"; path; startLine; startCol; endLine; endCol; currentFile]
     ->
     Commands.codeAction ~path
diff --git a/analysis/src/Packages.ml b/analysis/src/Packages.ml
index b330eac99..0ac43bef8 100644
--- a/analysis/src/Packages.ml
+++ b/analysis/src/Packages.ml
@@ -32,7 +32,10 @@ let newBsPackage ~rootPath =
   let bsconfigJson = Filename.concat rootPath "bsconfig.json" in
 
   let parseRaw raw =
-    let libBs = BuildSystem.getLibBs rootPath in
+    let libBs = match !Cfg.isDocGenFromCompiler with
+    | true -> BuildSystem.getStdlib rootPath
+    | false -> BuildSystem.getLibBs rootPath
+    in
     match Json.parse raw with
     | Some config -> (
       match FindFiles.findDependencyFiles rootPath config with
diff --git a/tools/CHANGELOG.md b/tools/CHANGELOG.md
index b132821ea..7674479dc 100644
--- a/tools/CHANGELOG.md
+++ b/tools/CHANGELOG.md
@@ -16,6 +16,11 @@
 
 - Expose more `decode` functions. https://github.com/rescript-lang/rescript-vscode/pull/866
 
+#### :house: [Internal]
+
+- Add env var `FROM_COMPILER` to extract docstrings from compiler repo. https://github.com/rescript-lang/rescript-vscode/pull/868
+
 #### :bug: Bug Fix
 
 - Fix tagged variant for `Module` and add attr to interface files. https://github.com/rescript-lang/rescript-vscode/pull/866
+- Fix output truncate when run `rescript-tools doc path/to/file.res` in a separate process. https://github.com/rescript-lang/rescript-vscode/pull/868
diff --git a/tools/src/Cli.res b/tools/src/Cli.res
index d4d72b4dd..0dfcc046d 100644
--- a/tools/src/Cli.res
+++ b/tools/src/Cli.res
@@ -11,13 +11,16 @@ module Buffer = {
   @send external toString: t => string = "toString"
 }
 
+type processEnvOptions = {stdio?: string}
 type spawnSyncResult = {
   stdout: Buffer.t,
   stderr: Buffer.t,
   status: Js.Null.t<int>,
 }
+
 @module("child_process")
-external spawnSync: (string, array<string>) => spawnSyncResult = "spawnSync"
+external spawnSync: (string, array<string>, option<processEnvOptions>) => spawnSyncResult =
+  "spawnSync"
 
 @val @scope("process")
 external exit: int => unit = "exit"
@@ -68,29 +71,21 @@ switch args->Belt.List.fromArray {
   switch rest {
   | list{"-h" | "--help"} => logAndExit(~log=docHelp, ~code=0)
   | list{filePath} =>
-    let spawn = spawnSync(analysisProdPath, ["extractDocs", filePath])
+    let spawn = spawnSync(analysisProdPath, ["extractDocs", filePath], Some({stdio: "inherit"}))
 
     switch spawn.status->Js.Null.toOption {
-    | Some(code) if code !== 0 => logAndExit(~log=spawn.stderr->Buffer.toString, ~code)
-    | Some(code) => logAndExit(~log=spawn.stdout->Buffer.toString, ~code)
-    | None => logAndExit(~log=`error: unexpected error to extract docs for ${filePath}`, ~code=1)
+    | Some(code) => exit(code)
+    | None => ()
     }
   | _ => logAndExit(~log=docHelp, ~code=1)
   }
 | list{"reanalyze", ...rest} =>
   let args = ["reanalyze"]->Js.Array2.concat(Belt.List.toArray(rest))
-  let spawn = spawnSync(analysisProdPath, args)
+  let spawn = spawnSync(analysisProdPath, args, Some({stdio: "inherit"}))
 
   switch spawn.status->Js.Null.toOption {
-  | Some(code) if code !== 0 => logAndExit(~log=spawn.stderr->Buffer.toString, ~code)
-  | Some(code) => logAndExit(~log=spawn.stdout->Buffer.toString, ~code)
-  | None =>
-    logAndExit(
-      ~log=`error: unexpected error to run reanalyze with arguments: ${args->Js.Array2.joinWith(
-          " ",
-        )}`,
-      ~code=1,
-    )
+  | Some(code) => exit(code)
+  | None => ()
   }
 | list{"-h" | "--help"} => logAndExit(~log=help, ~code=0)
 | list{"-v" | "--version"} =>