disassemble_function

Instructions

Implementation Reference

• binaryninja_server.py:82-97 (schema)

  Input schema definition for the disassemble_function tool in the list_tools MCP method response.

  "name": "disassemble_function",
  "description": "Disassemble a function in a binary file",
  "inputSchema": {
      "type": "object",
      "properties": {
          "path": {
              "type": "string",
              "description": "Path to the binary file"
          },
          "function": {
              "type": "string",
              "description": "Name of the function to disassemble"
          }
      },
      "required": ["path", "function"]
  }

• binaryninja_server.py:272-276 (registration)

  Registration and dispatching of call_tool 'disassemble_function' to the internal method handler.

  elif tool_name == "disassemble_function":
      return handle_request({
          "method": "disassemble_function",
          "params": tool_args
      }, client)

• binaryninja_server.py:330-341 (handler)

  Core handler for the disassemble_function MCP method: validates params, calls BinaryNinjaHTTPClient.get_disassembly, returns disassembly lines.

  elif method == "disassemble_function":
      path = params.get("path")
      func_name = params.get("function")
      if not path or not func_name:
          return {"error": "Path and function parameters are required"}
          
      # We assume the binary is already loaded
      # Just log the path for debugging
      logger.info(f"Using binary: {path}")
          
      disasm = client.get_disassembly(path, function_name=func_name)
      return {"result": disasm}

• binaryninja_mcp_http_server.py:330-348 (handler)

  HTTP MCP server handler for disassemble_function with JSON-RPC error handling and response wrapping.

  elif method == "disassemble_function":
      path = params.get("path")
      func = params.get("function")
      if not path:
          logger.error("Missing 'path' parameter")
          return self._error_response(request_id, -32602, "Missing 'path' parameter")
      if not func:
          logger.error("Missing 'function' parameter")
          return self._error_response(request_id, -32602, "Missing 'function' parameter")
      if not isinstance(path, str):
          logger.error(f"Invalid path type: {type(path)}")
          return self._error_response(request_id, -32602, "Parameter 'path' must be a string")
      if not isinstance(func, str):
          logger.error(f"Invalid function type: {type(func)}")
          return self._error_response(request_id, -32602, "Parameter 'function' must be a string")
      
      logger.debug(f"Disassembling function {func} in file: {path}")
      code = self.client.get_disassembly(path, function_name=func)
      return self._wrap_result(request_id, "\n".join(code))

• binaryninja_http_client.py:160-207 (helper)

  Helper method implementing the disassembly logic by searching functions and providing function info + decompiled HLIL as pseudo-disassembly via Binary Ninja HTTP API.

  def get_disassembly(self, file_path=None, function_name=None, function_address=None):
      """Get the disassembly of a specific function."""
      try:
          # Get function info first to get the address
          identifier = function_name if function_name else function_address
          if identifier is None:
              return ["No function identifier provided"]
              
          # Convert to string if it's not already
          if not isinstance(identifier, str):
              identifier = str(identifier)
              
          # Use the function info endpoint to get the function details
          # Since there's no direct disassembly endpoint, we'll use the function info
          # and format it as disassembly lines
          try:
              # First try to get function info
              response = self._request('GET', 'searchFunctions', params={"query": identifier})
              matches = response.get("matches", [])
              
              if not matches:
                  return [f"Function '{identifier}' not found"]
              
              # Get the first match
              func = matches[0]
              
              # Format the function info as disassembly lines
              disasm = []
              disasm.append(f"Function: {func.get('name', 'unknown')}")
              disasm.append(f"Address: {func.get('address', '0x0')}")
              
              # Try to get the decompiled code to show as pseudo-disassembly
              try:
                  decompiled = self.get_hlil(file_path, function_name=func.get('name'))
                  if decompiled and decompiled != "No decompilation available":
                      disasm.append("Decompiled code:")
                      for line in decompiled.split("\n"):
                          disasm.append(f"  {line}")
              except Exception:
                  pass
              
              return disasm
          except Exception as e:
              logger.warning(f"Failed to get function info: {e}")
              return [f"Error getting disassembly: {e}"]
      except Exception as e:
          logger.error(f"Failed to get disassembly: {e}")
          raise