diff --git a/src/json_extract/__init__.py b/src/json_extract/__init__.py
new file mode 100644
index 0000000..ea0d54b
--- /dev/null
+++ b/src/json_extract/__init__.py
@@ -0,0 +1,76 @@
+import json
+import os
+import urllib.request
+import urllib.error
+from typing import Dict, List, Optional
+
+
+def structure_to_json(text: str, schema: Dict) -> Dict:
+    """
+    Convert structured text to JSON using LOCAL_LLM_API.
+
+    Args:
+        text (str): The structured text to convert
+        schema (dict): The JSON schema to use for conversion
+
+    Returns:
+        dict: The parsed JSON object
+    """
+    # Get the API URL from environment variable
+    local_llm_api = os.environ.get("LOCAL_LLM_API", "http://host.docker.internal:1248/v1")
+    
+    # Format the schema as JSON string
+    schema_json = json.dumps(schema, indent=2)
+    
+    # Create the prompt following the pattern from jj-ai-commit.sh
+    prompt_text = f"""Analyse this text and respond ONLY with a valid JSON object matching the schema.
+
+Text:
+{text}
+
+Schema:
+{schema_json}"""
+    
+    # Build the request body
+    request_body = {
+        "model": "qwen3-coder",
+        "messages": [
+            {"role": "user", "content": prompt_text}
+        ]
+    }
+    
+    # Build the URL
+    url = f"{local_llm_api}/chat/completions"
+    
+    # Create the request
+    data = json.dumps(request_body).encode("utf-8")
+    req = urllib.request.Request(
+        url,
+        data=data,
+        headers={"Content-Type": "application/json"},
+        method="POST"
+    )
+    
+    try:
+        # Execute the request
+        with urllib.request.urlopen(req) as response:
+            result = json.loads(response.read().decode("utf-8"))
+    except urllib.error.URLError as e:
+        return {"error": f"API request failed: {e}", "raw_response": ""}
+    except json.JSONDecodeError as e:
+        return {"error": f"Failed to parse response: {e}", "raw_response": ""}
+    
+    try:
+        content = result.get("choices", [{}])[0].get("message", {}).get("content", "")
+        
+        # Clean markdown backticks from response
+        clean_content = content.strip()
+        while clean_content.startswith("`") or clean_content.startswith("```"):
+            clean_content = clean_content[1:].strip()
+        while clean_content.endswith("`") or clean_content.endswith("```"):
+            clean_content = clean_content[:-1].strip()
+        
+        # Parse the JSON content
+        return json.loads(clean_content)
+    except (json.JSONDecodeError, KeyError, IndexError) as e:
+        return {"error": f"Failed to parse JSON: {e}", "raw_response": json.dumps(result)}
diff --git a/src/json_extract/test_json_extract.py b/src/json_extract/test_json_extract.py
new file mode 100644
index 0000000..fe9a334
--- /dev/null
+++ b/src/json_extract/test_json_extract.py
@@ -0,0 +1,145 @@
+import unittest
+from unittest.mock import patch, MagicMock
+import json
+import os
+import sys
+
+sys.path.insert(0, "/workspace/src")
+
+from json_extract import structure_to_json
+
+
+class TestStructureToJson(unittest.TestCase):
+    def setUp(self):
+        os.environ.pop("LOCAL_LLM_API", None)
+
+    @patch("json_extract.urllib.request.urlopen")
+    def test_successful_conversion(self, mock_urlopen):
+        mock_response = MagicMock()
+        mock_response.read.return_value = json.dumps(
+            {"choices": [{"message": {"content": '{"name": "John", "age": 30}'}}]}
+        ).encode("utf-8")
+        mock_urlopen.return_value.__enter__.return_value = mock_response
+
+        text = "Nom: John, Age: 30"
+        schema = {
+            "type": "object",
+            "properties": {"name": {"type": "string"}, "age": {"type": "integer"}},
+        }
+
+        result = structure_to_json(text, schema)
+
+        self.assertEqual(result["name"], "John")
+        self.assertEqual(result["age"], 30)
+        self.assertNotIn("error", result)
+
+    @patch("json_extract.urllib.request.urlopen")
+    def test_markdown_backtick_removal(self, mock_urlopen):
+        mock_response = MagicMock()
+        mock_response.read.return_value = json.dumps(
+            {"choices": [{"message": {"content": '{"name": "John"}'}}]}
+        ).encode("utf-8")
+        mock_urlopen.return_value.__enter__.return_value = mock_response
+
+        text = "Nom: John"
+        schema = {"type": "object", "properties": {"name": {"type": "string"}}}
+
+        result = structure_to_json(text, schema)
+
+        self.assertEqual(result["name"], "John")
+
+    @patch("json_extract.urllib.request.urlopen")
+    def test_api_error_handling(self, mock_urlopen):
+        import urllib.error
+
+        mock_urlopen.side_effect = urllib.error.URLError("Connection refused")
+
+        text = "Some text"
+        schema = {"type": "object"}
+
+        result = structure_to_json(text, schema)
+
+        self.assertIn("error", result)
+        self.assertIn("API request failed", result["error"])
+
+    @patch("json_extract.urllib.request.urlopen")
+    def test_invalid_json_response(self, mock_urlopen):
+        mock_response = MagicMock()
+        mock_response.read.return_value = json.dumps(
+            {"choices": [{"message": {"content": "This is not JSON"}}]}
+        ).encode("utf-8")
+        mock_urlopen.return_value.__enter__.return_value = mock_response
+
+        text = "Some text"
+        schema = {"type": "object"}
+
+        result = structure_to_json(text, schema)
+
+        self.assertIn("error", result)
+        self.assertIn("Failed to parse JSON", result["error"])
+
+    @patch("json_extract.urllib.request.urlopen")
+    def test_empty_response(self, mock_urlopen):
+        mock_response = MagicMock()
+        mock_response.read.return_value = json.dumps({"choices": [{}]}).encode("utf-8")
+        mock_urlopen.return_value.__enter__.return_value = mock_response
+
+        text = "Some text"
+        schema = {"type": "object"}
+
+        result = structure_to_json(text, schema)
+
+        self.assertIn("error", result)
+
+    @patch("json_extract.urllib.request.Request")
+    @patch("json_extract.urllib.request.urlopen")
+    def test_custom_api_url(self, mock_urlopen, mock_request):
+        os.environ["LOCAL_LLM_API"] = "http://custom-api:8080/v1"
+
+        mock_response = MagicMock()
+        mock_response.read.return_value = json.dumps(
+            {"choices": [{"message": {"content": '{"data": "test"}'}}]}
+        ).encode("utf-8")
+        mock_urlopen.return_value.__enter__.return_value = mock_response
+
+        text = "Test data"
+        schema = {"type": "object", "properties": {"data": {"type": "string"}}}
+
+        result = structure_to_json(text, schema)
+
+        self.assertEqual(result["data"], "test")
+        mock_request.assert_called_once()
+        call_args = mock_request.call_args
+        self.assertEqual(call_args[0][0], "http://custom-api:8080/v1/chat/completions")
+
+    @patch("json_extract.urllib.request.Request")
+    @patch("json_extract.urllib.request.urlopen")
+    def test_default_api_url(self, mock_urlopen, mock_request):
+        os.environ.pop("LOCAL_LLM_API", None)
+
+        mock_response = MagicMock()
+        mock_response.read.return_value = json.dumps(
+            {"choices": [{"message": {"content": '{"data": "test"}'}}]}
+        ).encode("utf-8")
+        mock_urlopen.return_value.__enter__.return_value = mock_response
+
+        text = "Test data"
+        schema = {"type": "object"}
+
+        result = structure_to_json(text, schema)
+
+        self.assertNotIn("error", result)
+        mock_request.assert_called_once()
+        call_args = mock_request.call_args
+        self.assertEqual(
+            call_args[0][0], "http://host.docker.internal:1248/v1/chat/completions"
+        )
+
+    def test_empty_text_and_schema(self):
+        result = structure_to_json("", {})
+
+        self.assertIn("error", result)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/src/jujutsu/__init__.py b/src/jujutsu/__init__.py
new file mode 100644
index 0000000..d949b5f
--- /dev/null
+++ b/src/jujutsu/__init__.py
@@ -0,0 +1,134 @@
+import os
+import shlex
+from typing import Optional
+
+from json_extract import structure_to_json
+from jujutsu.command import jj_log as jj_log_command
+from jujutsu.command import jj_diff
+from jujutsu.command import jj_new as jj_new_command
+
+from .command import jj
+
+
+def jj_log(working_dir=None):
+    """
+    Execute jj log command for a project and return structured data as JSON.
+
+    Args:
+        project_path (str): The path of the project
+
+    Returns:
+        dict: JSON structure with commit history
+    """
+    # Execute jj log command with working_dir parameter
+    log_output = jj_log_command(working_dir=working_dir)
+
+    # Define the schema for the JSON structure
+    schema = {
+        "type": "array",
+        "items": {
+            "type": "object",
+            "properties": {
+                "hash": {"type": "string"},
+                "author": {"type": "string"},
+                "date": {"type": "string"},
+                "message": {"type": "string"},
+            },
+            "required": ["hash", "author", "date", "message"],
+        },
+    }
+
+    # Convert the text output to JSON using the schema
+    return structure_to_json(log_output, schema)
+
+
+def jj_commit_message(working_dir=None):
+    """
+    Generate a commit message from the current diff using LOCAL_LLM_API.
+
+    Args:
+        working_dir: The path of the project (optional)
+
+    Returns:
+        str: Generated commit message in format "title\n\nmessage"
+    """
+    diff_output = jj_diff(working_dir=working_dir)
+
+    prompt = """Analyse ce diff et réponds UNIQUEMENT avec un objet JSON valide contenant "title" (string) et "message" (string) pour le message de commit. Pas de texte avant ou après le JSON."""
+
+    content = f"{prompt}\n{diff_output}"
+
+    schema = {
+        "type": "object",
+        "properties": {
+            "title": {"type": "string"},
+            "message": {"type": "string"},
+        },
+        "required": ["title", "message"],
+    }
+
+    result = structure_to_json(content, schema)
+
+    if "error" in result:
+        return result["error"]
+
+    title = result.get("title", "")
+    message = result.get("message", "")
+
+    return f"{title}\n\n{message}"
+
+
+def jj_auto_describe(working_dir=None):
+    """
+    Automatically describe the current change using jj describe with AI-generated message.
+
+    Args:
+        working_dir: The path of the project (optional)
+
+    Returns:
+        str: Output of jj describe command
+    """
+    message = jj_commit_message(working_dir=working_dir)
+
+    args = ["-m", message]
+    return jj("describe", args=args, working_dir=working_dir)
+
+
+def jj_new(
+    revisions=None,
+    message=None,
+    no_edit=False,
+    insert_after=None,
+    insert_before=None,
+    options=None,
+    working_dir: Optional[str] = None,
+):
+    """
+    Create a new commit after documenting the current change with AI.
+
+    First runs jj_auto_describe to document the current working copy,
+    then creates a new empty commit with jj new.
+
+    Args:
+        revisions: List of parent revisions (default: [@])
+        message: The change description to use
+        no_edit: Do not edit the newly created change
+        insert_after: Insert the new change after the given commit(s)
+        insert_before: Insert the new change before the given commit(s)
+        options: List of additional options
+        working_dir: The path of the project (optional)
+
+    Returns:
+        str: Output of jj new command
+    """
+    jj_auto_describe(working_dir=working_dir)
+
+    return jj_new_command(
+        revisions=revisions,
+        message=message,
+        no_edit=no_edit,
+        insert_after=insert_after,
+        insert_before=insert_before,
+        options=options,
+        working_dir=working_dir,
+    )
diff --git a/src/jujutsu/command.py b/src/jujutsu/command.py
new file mode 100644
index 0000000..2114609
--- /dev/null
+++ b/src/jujutsu/command.py
@@ -0,0 +1,181 @@
+import json
+import os
+import subprocess
+from typing import List, Optional
+
+
+def jj(
+    subcommand: str,
+    options: Optional[List[str]] = None,
+    args: Optional[List[str]] = None,
+    template: Optional[str] = None,
+    working_dir: Optional[str] = None,
+) -> str:
+    """
+    Lance une commande jj.
+
+    Args:
+        subcommand: La sous-commande jj (ex: 'log', 'status', 'diff')
+        options: Liste des options (ex: ['--limit', '5'])
+        args: Liste des arguments additionnels
+        template: Template jj à utiliser (ex: 'builtin_log_compact')
+        working_dir: Répertoire de travail optionnel
+
+    Returns:
+        str: sortie de la commande
+    """
+    cmd = ["jj", subcommand]
+
+    # Ajoute le template spécifié
+    if template:
+        cmd.extend(["--template", template])
+
+    if options:
+        cmd.extend(options)
+    if args:
+        cmd.extend(args)
+
+    # Si un répertoire de travail est spécifié, on le change temporairement
+    if working_dir is not None:
+        original_cwd = os.getcwd()
+        try:
+            os.chdir(working_dir)
+            result = subprocess.run(cmd, capture_output=True, text=True)
+        finally:
+            os.chdir(original_cwd)
+    else:
+        result = subprocess.run(cmd, capture_output=True, text=True)
+
+    if result.returncode != 0:
+        raise RuntimeError(
+            f"Commande jj échouée: {' '.join(cmd)}\nstderr: {result.stderr}"
+        )
+
+    return result.stdout
+
+
+def jj_log(options=None, args=None, template=None, working_dir: Optional[str] = None):
+    """
+    Execute jj log command with optional arguments.
+
+    Args:
+        options: List of options to pass to jj log (ex: ['--limit', '5'])
+        args: List of additional arguments
+        template: Template to use (ex: 'builtin_log_compact')
+        working_dir: Working directory for the command (optional)
+
+    Returns:
+        str: Output of the jj log command
+    """
+    return jj("log", options, args, template, working_dir=working_dir)
+
+
+def jj_clone(url, destination=None, options=None, working_dir: Optional[str] = None):
+    """
+    Execute jj git clone command.
+
+    Args:
+        url: The repository URL to clone
+        destination: The destination directory (optional)
+        options: List of additional options for jj git clone
+        working_dir: Working directory for the command (optional)
+
+    Returns:
+        str: Output of the jj git clone command
+    """
+    args = ["clone", url]
+    if destination:
+        args.append(destination)
+
+    if options:
+        args.extend(options)
+
+    return jj("git", args=args, working_dir=working_dir)
+
+
+def jj_describe(
+    message: Optional[str] = None, options=None, working_dir: Optional[str] = None
+) -> str:
+    """
+    Execute jj describe command to set or view commit description.
+
+    Args:
+        message: The description text to set (optional, reads current if not provided)
+        options: List of additional options for jj describe
+        working_dir: Working directory for the command (optional)
+
+    Returns:
+        str: Output of the jj describe command
+    """
+    args = []
+    if message:
+        args.append(message)
+
+    if options:
+        args.extend(options)
+
+    return jj("describe", args=args, working_dir=working_dir)
+
+
+def jj_diff(
+    options=None, args=None, template=None, working_dir: Optional[str] = None
+) -> str:
+    """
+    Execute jj diff command with optional arguments.
+
+    Args:
+        options: List of options to pass to jj diff
+        args: List of additional arguments
+        template: Template to use
+        working_dir: Working directory for the command (optional)
+
+    Returns:
+        str: Output of the jj diff command
+    """
+    return jj("diff", options, args, template, working_dir=working_dir)
+
+
+def jj_new(
+    revisions=None,
+    message=None,
+    no_edit=False,
+    insert_after=None,
+    insert_before=None,
+    options=None,
+    working_dir: Optional[str] = None,
+) -> str:
+    """
+    Execute jj new command to create a new empty change.
+
+    Args:
+        revisions: List of parent revisions (default: [@])
+        message: The change description to use
+        no_edit: Do not edit the newly created change
+        insert_after: Insert the new change after the given commit(s)
+        insert_before: Insert the new change before the given commit(s)
+        options: List of additional options
+        working_dir: Working directory for the command (optional)
+
+    Returns:
+        str: Output of the jj new command
+    """
+    args = []
+    if revisions:
+        args.extend(revisions)
+
+    if message:
+        args.extend(["-m", message])
+
+    if no_edit:
+        args.append("--no-edit")
+
+    if insert_after:
+        args.extend(["--insert-after", insert_after])
+
+    if insert_before:
+        args.extend(["--insert-before", insert_before])
+
+    if options:
+        args.extend(options)
+
+    return jj("new", args=args, working_dir=working_dir)