Hex API MCP Server

Instructions

Implementation Reference

• src/hex_mcp/server.py:77-158 (handler)

  The main handler function for the 'search_hex_projects' tool. It is decorated with @mcp.tool() which registers it with the MCP server. The function implements regex-based searching of Hex projects by title, fetching projects in batches via the Hex API with dynamic batch sizing, rate limit handling via backoff, and returns paginated JSON results.
  @mcp.tool() async def search_hex_projects(search_pattern: str, limit: int = 100, offset: int = 0) -> str: """Search for Hex projects using regex pattern matching on project titles. Args: search_pattern: Regex pattern to search for in project titles limit: Maximum number of projects to return (default: 100) offset: Number of projects to skip for pagination (default: 0) Returns: JSON string with matching projects """ # Set a reasonable batch size for fetching projects - balance between # reducing API calls and not fetching too much at once batch_size = min(100, limit) # Don't request more than needed matched_projects = [] current_offset = offset total_fetched = 0 max_projects_to_search = 1000 # Safeguard against searching too many projects try: # Compile the regex pattern pattern = re.compile(search_pattern, re.IGNORECASE) # Continue fetching until we have enough matches or run out of projects while len(matched_projects) < limit and total_fetched < max_projects_to_search: # Adjust batch size dynamically based on match rate to minimize API calls if total_fetched > 0: match_rate = len(matched_projects) / total_fetched if match_rate > 0: # Estimate how many more projects we need to fetch remaining_matches_needed = limit - len(matched_projects) estimated_total_needed = remaining_matches_needed / match_rate # Adjust batch size based on estimate, with minimum of 20 and max of 100 batch_size = min(max(20, int(estimated_total_needed * 1.2)), 100) # Add 20% buffer params = {"limit": batch_size, "offset": current_offset} try: response = await hex_request("GET", "/projects", params=params) projects = response.get("values", []) # If no more projects, break if not projects: break # Filter projects by title using the regex pattern for project in projects: if "title" in project and pattern.search(project["title"]): matched_projects.append(project) if len(matched_projects) >= limit: break # Update for next batch total_fetched += len(projects) current_offset += len(projects) # Check pagination info pagination = response.get("pagination", {}) if not pagination.get("after"): break except httpx.HTTPStatusError as e: # If it's not a rate limit error that backoff can handle, raise it if e.response.status_code != 429: raise # Prepare the response with pagination info result = { "values": matched_projects[:limit], "total_matched": len(matched_projects), "total_searched": total_fetched, "has_more": len(matched_projects) >= limit or total_fetched >= max_projects_to_search, } return json.dumps(result) except re.error as e: return json.dumps({"error": f"Invalid regex pattern: {str(e)}"}) except Exception as e: return json.dumps({"error": f"Error searching projects: {str(e)}"})