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add claude spec generation
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Auto
322
server/services/spec_chat_session.py
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322
server/services/spec_chat_session.py
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"""
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Spec Creation Chat Session
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==========================
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Manages interactive spec creation conversation with Claude.
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Uses the create-spec.md skill to guide users through app spec creation.
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"""
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import asyncio
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import logging
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import threading
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from datetime import datetime
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from pathlib import Path
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from typing import AsyncGenerator, Optional
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from claude_agent_sdk import ClaudeAgentOptions, ClaudeSDKClient
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logger = logging.getLogger(__name__)
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# Root directory of the project
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ROOT_DIR = Path(__file__).parent.parent.parent
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class SpecChatSession:
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"""
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Manages a spec creation conversation for one project.
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Uses the create-spec skill to guide users through:
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- Phase 1: Project Overview (name, description, audience)
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- Phase 2: Involvement Level (Quick vs Detailed mode)
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- Phase 3: Technology Preferences
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- Phase 4: Features (main exploration phase)
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- Phase 5: Technical Details (derived or discussed)
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- Phase 6-7: Success Criteria & Approval
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"""
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def __init__(self, project_name: str):
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"""
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Initialize the session.
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Args:
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project_name: Name of the project being created
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"""
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self.project_name = project_name
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self.project_dir = ROOT_DIR / "generations" / project_name
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self.client: Optional[ClaudeSDKClient] = None
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self.messages: list[dict] = []
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self.complete: bool = False
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self.created_at = datetime.now()
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self._conversation_id: Optional[str] = None
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self._client_entered: bool = False # Track if context manager is active
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async def close(self) -> None:
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"""Clean up resources and close the Claude client."""
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if self.client and self._client_entered:
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try:
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await self.client.__aexit__(None, None, None)
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except Exception as e:
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logger.warning(f"Error closing Claude client: {e}")
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finally:
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self._client_entered = False
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self.client = None
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async def start(self) -> AsyncGenerator[dict, None]:
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"""
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Initialize session and get initial greeting from Claude.
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Yields message chunks as they stream in.
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"""
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# Load the create-spec skill
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skill_path = ROOT_DIR / ".claude" / "commands" / "create-spec.md"
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if not skill_path.exists():
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yield {
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"type": "error",
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"content": f"Spec creation skill not found at {skill_path}"
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}
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return
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try:
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skill_content = skill_path.read_text(encoding="utf-8")
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except UnicodeDecodeError:
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skill_content = skill_path.read_text(encoding="utf-8", errors="replace")
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# Replace $ARGUMENTS with the project path (use forward slashes for consistency)
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project_path = f"generations/{self.project_name}"
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system_prompt = skill_content.replace("$ARGUMENTS", project_path)
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# Create Claude SDK client with limited tools for spec creation
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try:
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self.client = ClaudeSDKClient(
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options=ClaudeAgentOptions(
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model="claude-sonnet-4-20250514",
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system_prompt=system_prompt,
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allowed_tools=[
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"Read",
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"Write",
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"AskUserQuestion",
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],
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max_turns=100,
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cwd=str(ROOT_DIR.resolve()),
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)
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)
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# Enter the async context and track it
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await self.client.__aenter__()
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self._client_entered = True
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except Exception as e:
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logger.exception("Failed to create Claude client")
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yield {
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"type": "error",
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"content": f"Failed to initialize Claude: {str(e)}"
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}
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return
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# Start the conversation - Claude will send the Phase 1 greeting
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try:
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async for chunk in self._query_claude("Begin the spec creation process."):
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yield chunk
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# Signal that the response is complete (for UI to hide loading indicator)
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yield {"type": "response_done"}
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except Exception as e:
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logger.exception("Failed to start spec chat")
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yield {
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"type": "error",
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"content": f"Failed to start conversation: {str(e)}"
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}
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async def send_message(self, user_message: str) -> AsyncGenerator[dict, None]:
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"""
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Send user message and stream Claude's response.
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Args:
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user_message: The user's response
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Yields:
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Message chunks of various types:
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- {"type": "text", "content": str}
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- {"type": "question", "questions": list}
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- {"type": "spec_complete", "path": str}
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- {"type": "error", "content": str}
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"""
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if not self.client:
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yield {
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"type": "error",
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"content": "Session not initialized. Call start() first."
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}
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return
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# Store the user message
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self.messages.append({
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"role": "user",
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"content": user_message,
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"timestamp": datetime.now().isoformat()
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})
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try:
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async for chunk in self._query_claude(user_message):
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yield chunk
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# Signal that the response is complete (for UI to hide loading indicator)
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yield {"type": "response_done"}
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except Exception as e:
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logger.exception("Error during Claude query")
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yield {
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"type": "error",
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"content": f"Error: {str(e)}"
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}
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async def _query_claude(self, message: str) -> AsyncGenerator[dict, None]:
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"""
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Internal method to query Claude and stream responses.
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Handles tool calls (AskUserQuestion, Write) and text responses.
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"""
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if not self.client:
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return
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# Send the message to Claude using the SDK's query method
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await self.client.query(message)
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current_text = ""
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# Stream the response using receive_response
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async for msg in self.client.receive_response():
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msg_type = type(msg).__name__
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if msg_type == "AssistantMessage" and hasattr(msg, "content"):
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# Process content blocks in the assistant message
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for block in msg.content:
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block_type = type(block).__name__
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if block_type == "TextBlock" and hasattr(block, "text"):
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# Accumulate text and yield it
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text = block.text
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if text:
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current_text += text
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yield {"type": "text", "content": text}
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# Store in message history
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self.messages.append({
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"role": "assistant",
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"content": text,
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"timestamp": datetime.now().isoformat()
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})
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elif block_type == "ToolUseBlock" and hasattr(block, "name"):
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tool_name = block.name
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tool_input = getattr(block, "input", {})
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tool_id = getattr(block, "id", "")
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if tool_name == "AskUserQuestion":
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# Convert AskUserQuestion to structured UI
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questions = tool_input.get("questions", [])
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yield {
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"type": "question",
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"questions": questions,
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"tool_id": tool_id
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}
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# The SDK handles tool results internally
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elif tool_name == "Write":
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# File being written - the SDK handles this
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file_path = tool_input.get("file_path", "")
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# Check if this is the app_spec.txt file
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if "app_spec.txt" in str(file_path):
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self.complete = True
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yield {
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"type": "spec_complete",
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"path": str(file_path)
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}
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elif "initializer_prompt.md" in str(file_path):
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yield {
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"type": "file_written",
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"path": str(file_path)
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}
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elif msg_type == "UserMessage" and hasattr(msg, "content"):
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# Tool results - the SDK handles these automatically
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# We just watch for any errors
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for block in msg.content:
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block_type = type(block).__name__
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if block_type == "ToolResultBlock":
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is_error = getattr(block, "is_error", False)
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if is_error:
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content = getattr(block, "content", "Unknown error")
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logger.warning(f"Tool error: {content}")
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def is_complete(self) -> bool:
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"""Check if spec creation is complete."""
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return self.complete
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def get_messages(self) -> list[dict]:
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"""Get all messages in the conversation."""
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return self.messages.copy()
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# Session registry with thread safety
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_sessions: dict[str, SpecChatSession] = {}
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_sessions_lock = threading.Lock()
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def get_session(project_name: str) -> Optional[SpecChatSession]:
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"""Get an existing session for a project."""
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with _sessions_lock:
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return _sessions.get(project_name)
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async def create_session(project_name: str) -> SpecChatSession:
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"""Create a new session for a project, closing any existing one."""
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old_session: Optional[SpecChatSession] = None
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with _sessions_lock:
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# Get existing session to close later (outside the lock)
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old_session = _sessions.pop(project_name, None)
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session = SpecChatSession(project_name)
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_sessions[project_name] = session
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# Close old session outside the lock to avoid blocking
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if old_session:
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try:
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await old_session.close()
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except Exception as e:
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logger.warning(f"Error closing old session for {project_name}: {e}")
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return session
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async def remove_session(project_name: str) -> None:
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"""Remove and close a session."""
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session: Optional[SpecChatSession] = None
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with _sessions_lock:
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session = _sessions.pop(project_name, None)
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# Close session outside the lock
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if session:
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try:
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await session.close()
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except Exception as e:
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logger.warning(f"Error closing session for {project_name}: {e}")
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def list_sessions() -> list[str]:
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"""List all active session project names."""
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with _sessions_lock:
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return list(_sessions.keys())
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async def cleanup_all_sessions() -> None:
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"""Close all active sessions. Called on server shutdown."""
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sessions_to_close: list[SpecChatSession] = []
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with _sessions_lock:
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sessions_to_close = list(_sessions.values())
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_sessions.clear()
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for session in sessions_to_close:
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try:
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await session.close()
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except Exception as e:
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logger.warning(f"Error closing session {session.project_name}: {e}")
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