diff --git a/coml/core.py b/coml/core.py
index 2bc2331..9049884 100644
--- a/coml/core.py
+++ b/coml/core.py
@@ -31,8 +31,12 @@
 )
 from .vis_utils import VisVerifier
 
+_debug_mode: bool = False
+
 
 def debug_messages(*messages: BaseMessage) -> None:
+    if not _debug_mode:
+        return
     for message in messages:
         if isinstance(message, SystemMessage):
             print(colorama.Fore.BLUE + message.content + colorama.Fore.RESET + "\n")
@@ -113,10 +117,10 @@ def generate_code(
         )
         question, _ = render_generate_context(context)
         messages.append(HumanMessage(content=question))
-        # debug_messages(*messages)
+        debug_messages(*messages)
 
         response = self.llm(messages)
-        # debug_messages(response)
+        debug_messages(response)
         code = parse_code(response.content)
         return {**context, "answer": code}
 
diff --git a/coml/magics.py b/coml/magics.py
index 4ec4287..8c175c8 100644
--- a/coml/magics.py
+++ b/coml/magics.py
@@ -25,6 +25,7 @@
     run_code_in_next_cell,
     update_running_cell_metadata,
 )
+from .linter import lint
 from .prompt_utils import (
     FixContext,
     GenerateContext,
@@ -33,6 +34,38 @@
     filter_variables,
 )
 
+VERIFY_STYLE = """
+<style>
+summary {
+  display: list-style;
+}
+details :last-child {
+  margin-bottom: 1em;
+}
+.loader {
+  width: 1em;
+  height: 1em;
+  border: 0.1em solid;
+  border-bottom-color: transparent;
+  border-radius: 50%;
+  display: inline-block;
+  box-sizing: border-box;
+  animation: rotation 1s linear infinite;
+  margin-bottom: 0 !important;
+}
+
+@keyframes rotation {
+  0% {
+    transform: rotate(0deg);
+  }
+  100% {
+    transform: rotate(360deg);
+  }
+}
+
+</style>
+"""
+
 
 @magics_class
 class CoMLMagics(Magics):
@@ -116,6 +149,22 @@ def coml(self, line, cell=None):
         )
         return self._post_generation(generate_context["answer"], generate_context)
 
+    @no_var_expand
+    @line_magic
+    def comlset(self, line):
+        key, value = line.lower().strip().split()
+        if key == "debug":
+            from . import core
+
+            if value == "on":
+                core._debug_mode = True
+            elif value == "off":
+                core._debug_mode = False
+            else:
+                raise ValueError("Debug mode must be either on or off.")
+        else:
+            raise ValueError("Unknown setting.")
+
     @no_var_expand
     @line_magic
     def comlinspire(self, line):
@@ -202,47 +251,11 @@ def comlverify(self, line):
         generated_vis = False
         if context.get("action") == "run":
             error, output = parse_cell_outputs(target_cell["outputs"])
-            generated_vis = (
-                output
-                and "<image/svg+xml>" in output
-                and "request" in context
-                and "answer" in context
-                and "codes" in context
-                and "variables" in context
-            )
-        style = """<style>
-summary {
-  display: list-style;
-}
-details :last-child {
-  margin-bottom: 1em;
-}
-.loader {
-  width: 1em;
-  height: 1em;
-  border: 0.1em solid;
-  border-bottom-color: transparent;
-  border-radius: 50%;
-  display: inline-block;
-  box-sizing: border-box;
-  animation: rotation 1s linear infinite;
-  margin-bottom: 0 !important;
-}
-
-@keyframes rotation {
-  0% {
-    transform: rotate(0deg);
-  }
-  100% {
-    transform: rotate(360deg);
-  }
-}
-
-</style>"""
+            generated_vis = output and "<image/svg+xml>" in output
 
         def display_statuses(statuses):
             clear_output(wait=True)
-            html = style + "\n"
+            html = VERIFY_STYLE + "\n"
             display_names = {
                 "lint": "PyLint",
                 "rubberduck": "Rubberduck",
@@ -261,21 +274,33 @@ def display_statuses(statuses):
                 False: "❌",
             }
             loading = "<span class='loader'></span>"
+            message_template = "<details><summary><b>{}:</b> {}</summary>\n{}</details>"
             for name in display_names:
                 detail_message = "Still loading..."
                 if name in statuses:
                     detail_message = markdown.markdown(
                         statuses[name]["details"], extensions=["nl2br"]
                     )
-                html += f"""<details>
-<summary><b>{display_names[name]}:</b> {loading if name not in statuses else status_icon[statuses[name]["result"]]}</summary>
-{detail_message}
-</details>\n"""
+                html += message_template.format(
+                    display_names[name],
+                    loading
+                    if name not in statuses
+                    else status_icon[statuses[name]["result"]],
+                    detail_message,
+                )
+
             display(HTML(html))
 
         result = {}
         display_statuses(result)
 
+        lint_result, lint_details = lint("\n".join(self._get_code_context()), code)
+        result["lint"] = {
+            "result": lint_result,
+            "details": lint_details,
+        }
+        display_statuses(result)
+
         rubberduck_result, rubberduck_details = self.agent.static_check(code, context)
         result["rubberduck"] = {
             "result": rubberduck_result,
@@ -287,18 +312,20 @@ def display_statuses(statuses):
             # verify generated vis
             svg_string = output.replace("<image/svg+xml>", "")
             request = context["request"]
-            new_code = context["answer"]
-            previous_code = "\n".join(context["codes"])
             variables = context["variables"]
 
             # Roughly judge the source of the visualization
-            if "plt.show()" in new_code:
-                source = "matplotlib"
+            if "plt.show()" in code:
+                vis_framework = "matplotlib"
                 (
                     visualization_check_result,
                     visualization_check_details,
                 ) = self.agent.visualization_check(
-                    request, previous_code, svg_string, variables, source
+                    context["request"],
+                    "\n".join(self._get_code_context()),
+                    code,
+                    context["variables"],
+                    vis_framework,
                 )
                 details = ""
                 for detail in visualization_check_details:
@@ -308,6 +335,7 @@ def display_statuses(statuses):
                     "details": details,
                 }
                 display_statuses(result)
+
         elif error or output:
             sanity_result, sanity_details = self.agent.output_sanity_check(
                 code, context, error, output
diff --git a/package.json b/package.json
index 28eb15d..b7601ec 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "coml",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "JupyterLab extension for CoML.",
   "keywords": [
     "jupyter",
diff --git a/pyproject.toml b/pyproject.toml
index 26cdd23..c5d2ab1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mlcopilot"
-version = "0.0.2"
+version = "0.0.3"
 dependencies = [
   "click",
   "colorama",