fix(export): prompt in workspace.yaml now describes PR changes

- Prompt shows what the PR does, not add tests for X
- Remove conventional commit prefixes (fix:, feat:, etc.)
- Remove [brackets] like [BUG] or [Feature]
- Natural description of the PR change
- Tests: 1197 pass

Author: Atlas

src/swe_forge/export/workspace.py

@@ -21,34 +21,37 @@ def _extract_test_file_names(test_patch: str) -> list[str]:
     return [Path(m).name for m in matches]
 
 
-def _make_natural_prompt(original_prompt: str, repo: str) -> str:
-    """Transform technical PR description into natural user prompt.
+def _make_natural_prompt(original_prompt: str, repo: str, patch: str = "") -> str:
+    """Create a simple natural prompt from PR info.
     
     Args:
-        original_prompt: Original PR title/description
+        original_prompt: Original PR title/description  
         repo: Repository name
+        patch: The patch diff (optional)
         
     Returns:
-        Natural prompt like a real user would write
+        Simple natural prompt describing the changes
     """
-    # Clean up the prompt
+    if not original_prompt:
+        return f"Changes in {repo}" if repo else "Changes"
+    
     prompt = original_prompt.strip()
 
-    # Remove common prefixes
-    for prefix in ["fix:", "feat:", "refactor:", "chore:", "docs:", "style:", "test:"]:
+    # Remove conventional commit prefixes (fix:, feat:, refactor:, etc.)
+    for prefix in ["fix:", "feat:", "refactor:", "chore:", "docs:", "style:", "test:", "build:", "perf:", "ci:"]:
         if prompt.lower().startswith(prefix):
             prompt = prompt[len(prefix):].strip()
             break
 
-    # Truncate if too long
-    if len(prompt) > 150:
-        prompt = prompt[:147] + "..."
+    # Remove leading [brackets] like [BUG] or [Feature]
+    import re
+    prompt = re.sub(r"^\[[^\]]+\]\s*", "", prompt)
 
-    # Create natural prompt
+    # Capitalize first letter
     if prompt:
-        return f"Can you add tests for: {prompt}"
-    else:
-        return f"Can you add tests for the changes in {repo}?"
+        prompt = prompt[0].upper() + prompt[1:]
+    
+    return prompt[:200] if prompt else f"Changes in {repo}"
 
 
 def export_task_to_workspace(
@@ -106,7 +109,7 @@ def export_task_to_workspace(
         },
         "language": task.language,
         "difficulty_score": task.difficulty_score,
-        "prompt": _make_natural_prompt(task.prompt, task.repo),
+        "prompt": _make_natural_prompt(task.prompt, task.repo, task.patch),
         "environment": {
             "image": docker_image or "ubuntu:24.04",
             "language_version": (

src/swe_forge/swe/prompt_generator.py

@@ -0,0 +1,52 @@
+"""Generate natural prompts for SWE tasks using LLM."""
+
+from logging import getLogger
+
+logger = getLogger(__name__)
+
+
+async def generate_task_prompt(llm_client, task) -> str:
+    """Generate a natural prompt describing the PR changes.
+    
+    Args:
+        llm_client: LLM client for generation
+        task: SweTask with PR info
+        
+    Returns:
+        Natural prompt like a user would write
+    """
+    if not llm_client:
+        # Fallback to original prompt
+        return task.prompt or f"Changes in {task.repo}"
+    
+    try:
+        from swe_forge.llm.models import GenerationRequest, GenerationResponse
+        
+        system = "You write short, natural descriptions of code changes."
+        
+        user = f"""Describe this GitHub PR in one sentence, like a developer would explain it to a colleague.
+
+PR title: {task.prompt[:200]}
+Repo: {task.repo}
+
+Just describe what changed, nothing else. Keep it under 50 words."""
+
+        request = GenerationRequest(
+            model=llm_client.default_model,
+            messages=[
+                {"role": "system", "content": system},
+                {"role": "user", "content": user},
+            ],
+            temperature=0.3,
+            max_tokens=100,
+        )
+        
+        response = await llm_client.complete(request)
+        
+        if response.choices and response.choices[0].message:
+            return response.choices[0].message.content.strip()
+    except Exception as e:
+        logger.debug(f"LLM prompt generation failed: {e}")
+    
+    # Fallback
+    return task.prompt or f"Changes in {task.repo}"