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import json
import traceback
import logging
from typing import Dict, Any, Optional
from src.services.scraper import scrape_url
from src.agent import run_agent_workflow
def run_mcp_server():
"""
Runs the Model Context Protocol (MCP) server over standard I/O (stdin/stdout).
To prevent any print statements, logs, or external library debug outputs from
corrupting the JSON-RPC stream, sys.stdout is redirected to sys.stderr, while
original stdout is preserved specifically for sending JSON-RPC response frames.
"""
# Preserve original stdout for JSON-RPC communication
original_stdout = sys.stdout
# Redirect global stdout to stderr so all general print() calls go to stderr
sys.stdout = sys.stderr
# Reconfigure stdin/stdout text streams to use UTF-8 and handle encoding errors gracefully (especially on Windows)
if hasattr(sys.stdin, "reconfigure"):
try:
sys.stdin.reconfigure(encoding="utf-8", errors="replace")
except Exception as e:
print(f"[MCP Server] Warning reconfiguring stdin encoding: {str(e)}", file=sys.stderr)
if hasattr(original_stdout, "reconfigure"):
try:
original_stdout.reconfigure(encoding="utf-8", errors="replace")
except Exception as e:
print(f"[MCP Server] Warning reconfiguring stdout encoding: {str(e)}", file=sys.stderr)
# Redirect any existing standard logging stream handlers pointing to stdout to prevent JSON-RPC contamination
try:
for handler in logging.root.handlers:
if isinstance(handler, logging.StreamHandler) and handler.stream in (sys.__stdout__, original_stdout):
handler.setStream(sys.stderr)
except Exception as e:
print(f"[MCP Server] Warning redirecting logging handlers: {str(e)}", file=sys.stderr)
print("[MCP Server] Starting hardened MCP server stream loop...", file=sys.stderr)
print("[MCP Server] Redirected sys.stdout and standard logging handlers to sys.stderr to protect stream channel.", file=sys.stderr)
# Process standard input line by line
for line in sys.stdin:
if not line.strip():
continue
req_id = None
is_notification = True
def send_response(response: Dict[str, Any], force: bool = False):
# Notifications MUST NOT receive responses per JSON-RPC 2.0 spec,
# except for severe Parse/Invalid Request errors where we force a response.
if is_notification and not force:
return
try:
out_line = json.dumps(response) + "\n"
original_stdout.write(out_line)
original_stdout.flush()
except Exception as e:
print(f"[MCP Server] Error writing response to stdout: {str(e)}", file=sys.stderr)
def send_error(code: int, message: str, r_id: Optional[Any] = None, data: Optional[Any] = None):
err_resp = {
"jsonrpc": "2.0",
"error": {
"code": code,
"message": message
}
}
if data is not None:
err_resp["error"]["data"] = data
if r_id is not None:
err_resp["id"] = r_id
else:
err_resp["id"] = None
# Severe protocol validation errors (parse error, invalid request) are sent back
force_reply = code in [-32700, -32600]
send_response(err_resp, force=force_reply)
try:
request = json.loads(line)
if not isinstance(request, dict):
send_error(-32600, "Invalid Request: expected JSON object")
continue
# Determine if this message is a request or notification
is_notification = "id" not in request
req_id = request.get("id")
method = request.get("method")
jsonrpc = request.get("jsonrpc")
# Verify JSON-RPC version
if jsonrpc and jsonrpc != "2.0":
print(f"[MCP Server] Warning: received JSON-RPC version {jsonrpc}, expecting 2.0", file=sys.stderr)
if not method or not isinstance(method, str):
send_error(-32600, "Invalid Request: missing or invalid method field", req_id)
continue
# Parse parameters safely
params = request.get("params")
if params is None:
params = {}
elif not isinstance(params, dict):
send_error(-32602, "Invalid params: expected JSON object", req_id)
continue
print(f"[MCP Server] Received method: '{method}' (id: {req_id}, notification: {is_notification})", file=sys.stderr)
# 1. Protocol Lifecycle Handshake
if method == "initialize":
protocol_version = params.get("protocolVersion", "2024-11-05")
response = {
"jsonrpc": "2.0",
"id": req_id,
"result": {
"protocolVersion": protocol_version,
"capabilities": {
"tools": {}
},
"serverInfo": {
"name": "Smart-API-DevTool-Server",
"version": "1.0.0"
}
}
}
send_response(response)
elif method == "notifications/initialized":
print("[MCP Server] Initialized notification received.", file=sys.stderr)
elif method == "ping":
response = {
"jsonrpc": "2.0",
"id": req_id,
"result": {}
}
send_response(response)
# 2. Tool Discovery
elif method == "tools/list":
tools = [
{
"name": "scrape_url",
"description": "Scrapes the target API documentation URL using Firecrawl and returns the clean markdown content.",
"inputSchema": {
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "The HTTP or HTTPS URL of the API documentation page to scrape."
},
"api_key": {
"type": "string",
"description": "Optional Firecrawl API Key. If not provided, it falls back to the server configuration."
}
},
"required": ["url"]
}
},
{
"name": "generate_wrapper",
"description": "Generates a complete, verified API client wrapper class, usage README guide, and unit tests using a self-healing LangGraph agentic loop.",
"inputSchema": {
"type": "object",
"properties": {
"scraped_text": {
"type": "string",
"description": "The raw text or scraped markdown documentation of the API."
},
"use_case": {
"type": "string",
"description": "Details of the target use case and functions to implement in the wrapper."
},
"language": {
"type": "string",
"description": "Target programming language (e.g. 'python', 'typescript', 'go', 'java'). Default is 'python'."
},
"model_provider": {
"type": "string",
"description": "The model provider to use ('gemini', 'ollama', 'groq', or 'openrouter'). Default is 'gemini'."
},
"gemini_key": {
"type": "string",
"description": "Optional Google Gemini API Key. Required if model_provider is 'gemini' and the server has no key configured."
},
"gemini_model": {
"type": "string",
"description": "Optional Google Gemini Model ID (e.g. 'gemini-2.5-flash')."
},
"groq_key": {
"type": "string",
"description": "Optional Groq API Key. Required if model_provider is 'groq' and the server has no key configured."
},
"groq_model": {
"type": "string",
"description": "Optional Groq Model ID (e.g., 'llama-3.3-70b-versatile')."
},
"openrouter_key": {
"type": "string",
"description": "Optional OpenRouter API Key. Required if model_provider is 'openrouter' and the server has no key configured."
},
"openrouter_model": {
"type": "string",
"description": "Optional OpenRouter Model ID (e.g., 'openrouter/free')."
},
"firecrawl_key": {
"type": "string",
"description": "Optional Firecrawl API Key."
}
},
"required": ["scraped_text", "use_case"]
}
}
]
response = {
"jsonrpc": "2.0",
"id": req_id,
"result": {
"tools": tools
}
}
send_response(response)
# 3. Tool Execution
elif method == "tools/call":
tool_name = params.get("name")
arguments = params.get("arguments")
if not tool_name or not isinstance(tool_name, str):
send_error(-32602, "Invalid params: missing or invalid tool name", req_id)
continue
if arguments is None:
arguments = {}
elif not isinstance(arguments, dict):
send_response({
"jsonrpc": "2.0",
"id": req_id,
"result": {
"content": [{"type": "text", "text": "Error: 'arguments' must be a JSON object matching tool schema."}],
"isError": True
}
})
continue
print(f"[MCP Server] Calling tool '{tool_name}' (arguments present: {list(arguments.keys())})", file=sys.stderr)
if tool_name == "scrape_url":
url = arguments.get("url")
if not url or not isinstance(url, str):
send_response({
"jsonrpc": "2.0",
"id": req_id,
"result": {
"content": [{"type": "text", "text": "Error: 'url' parameter is required and must be a string."}],
"isError": True
}
})
continue
try:
scraped_markdown = scrape_url(url, api_key=arguments.get("api_key"))
send_response({
"jsonrpc": "2.0",
"id": req_id,
"result": {
"content": [{"type": "text", "text": scraped_markdown}]
}
})
except Exception as e:
print(f"[MCP Server] Error in scrape_url: {traceback.format_exc()}", file=sys.stderr)
send_response({
"jsonrpc": "2.0",
"id": req_id,
"result": {
"content": [{"type": "text", "text": f"Scrape failed: {str(e)}"}],
"isError": True
}
})
elif tool_name == "generate_wrapper":
scraped_text = arguments.get("scraped_text")
use_case = arguments.get("use_case")
language = arguments.get("language", "python")
model_provider = arguments.get("model_provider", "gemini")
gemini_key = arguments.get("gemini_key")
gemini_model = arguments.get("gemini_model")
groq_key = arguments.get("groq_key")
groq_model = arguments.get("groq_model")
openrouter_key = arguments.get("openrouter_key")
openrouter_model = arguments.get("openrouter_model")
firecrawl_key = arguments.get("firecrawl_key")
if not scraped_text or not isinstance(scraped_text, str) or not use_case or not isinstance(use_case, str):
send_response({
"jsonrpc": "2.0",
"id": req_id,
"result": {
"content": [{"type": "text", "text": "Error: 'scraped_text' and 'use_case' parameters must be non-empty strings."}],
"isError": True
}
})
continue
try:
agent_result = run_agent_workflow(
scraped_text=scraped_text,
use_case=use_case,
language=str(language),
model_provider=str(model_provider),
gemini_key=gemini_key,
gemini_model=gemini_model,
groq_key=groq_key,
groq_model=groq_model,
openrouter_key=openrouter_key,
openrouter_model=openrouter_model,
firecrawl_key=firecrawl_key
)
cleaned_result = {
"success": agent_result.get("test_passed", False),
"overview": agent_result.get("overview", ""),
"endpoints": agent_result.get("endpoints", ""),
"code": agent_result.get("code", ""),
"tests": agent_result.get("tests", ""),
"readme": agent_result.get("readme", ""),
"retry_count": agent_result.get("retry_count", 0),
"error_logs": agent_result.get("error_logs", "")
}
send_response({
"jsonrpc": "2.0",
"id": req_id,
"result": {
"content": [{"type": "text", "text": json.dumps(cleaned_result, indent=2)}]
}
})
except Exception as e:
print(f"[MCP Server] Error in generate_wrapper: {traceback.format_exc()}", file=sys.stderr)
send_response({
"jsonrpc": "2.0",
"id": req_id,
"result": {
"content": [{"type": "text", "text": f"Wrapper generation failed: {str(e)}"}],
"isError": True
}
})
else:
send_error(-32601, f"Method '{method}' tool '{tool_name}' not found", req_id)
else:
send_error(-32601, f"Method '{method}' not found", req_id)
except json.JSONDecodeError:
send_error(-32700, "Parse error: invalid JSON received")
except Exception as e:
print(f"[MCP Server] Unexpected exception: {traceback.format_exc()}", file=sys.stderr)
send_error(-32603, f"Internal error: {str(e)}", req_id)
print("[MCP Server] Stdin EOF reached. Exiting server.", file=sys.stderr)
if __name__ == "__main__":
run_mcp_server()
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